Engine - Repair (m54) BMW X3 E83

00 00 250 BMW engine oil service (M54/56)

Recycling

Catch and dispose of used oil in a suitable container.

Observe country-specific waste-disposal regulations.

Undo oil filter cap (36 A/F).

Scheme 47

Oil flows from oil-filter housing into oil pan.

Installation

Tightening torque: 11 42 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

Replace seals and coat with oil.

Scheme 48

Once oil has drained from oil filter housing, open oil drain plug or draw off oil.

Scheme 49

Installation

Replace sealing ring.

Tightening torque: 11 13 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

00 00 250 BMW engine oil service incl. supplementary service (M54 / M56)

Note. Work step 00 00 250 comprises the engine oil and supplementary services. Only the engine oil service will be described in these repair instructions. For the supplementary service work steps, refer to the vehicle -specific inspection sheet.

Engine oil service

Release and tighten down main flow oil filter cap with a socket only.

Scheme 50

When the main flow oil filter cap is opened, engine oil flows from the oil filter housing back into the oil sump. Release main flow oil filter cap and remove towards top.

Installation

Tightening torque 11 42 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

Replace and oil O-ring.

Scheme 51

Drain or draw off engine oil.

Scheme 52

When engine oil is drained, open cap in engine underguard.

Open oil drain plug and drain off engine oil.

Installation

Replace sealing ring.

Tightening torque 11 13 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Complete vehicle and set in horizontal position.

Top up engine oil.

Start engine and run at idle until oil indicator lamp goes out.

Switch off engine, wait approx. 5 minutes and then check engine oil level.

Top up engine oil if necessary.

Supplementary service

Refer to vehicle-specific inspection sheet.

11 00 039 Checking compression of all cylinders (M60 / M62 / M73 / S62 / M54)

Special tools required

1. 110 224
2. 110 226

Cut off power supply to ignition coils (disconnect plug connection at DME control unit).

Necessary preliminary tasks

1. Connect charger or a second battery.
2. Read out fault memory of DME control unit
3. Pull fuel pump relay or fuel pump fuse.
4. Start engine and allow residual fuel to drain out (pressure reduction).
5. Remove all spark plugs.

Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 0224.

Scheme 53

Note. Check that sealing ring is in perfect condition (see arrow).

Depress accelerator and actuate starter until compression stops rising.

Scheme 54

Compression pressure, refer to ENGINE - TECHNICAL DATA .

Assemble engine.

Now clear the fault memory.

Scheme 55

1. Connect DIS tester
2. BMW measuring technology
3. Preset measurements
4. Absolute compression The further procedure is described in Help Help on preset measurements Adaptation of "Absolute compression"
5. Clear fault memory

11 00 050 Removing and installing engine (M54)

Special tools required

1. 11 0 020
2. 11 0 250
3. 13 5 280

Necessary preliminary tasks

1. Disconnect battery negative lead. Refer to «12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY»(/bmw/x3/e83-2003-2006/remont/gauges-instrument-panels/#engine-electrical-system-repair-m54__12-00-instructions-for-disconnecting-and) .
2. Lift engine hood into assembly position. Refer to «51 00 ... SERVICE POSITION OF ENGINE HOOD»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-00-service-position-of) .
3. Remove design cover.
4. Remove air cleaner housing. Refer to «13 71 000 REMOVING AND INSTALLING INTAKE FILTER HOUSING (M54)»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-system-repair-instructions-m54__13-71-000-removing-and-installing) .
5. Remove clean air duct.
6. Remove heater bulkhead. Refer to «51 71 080 REMOVING AND INSTALLING/REPLACING HEATER BULKHEAD»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-080-removing-and-installingreplacing) .
7. Remove left assembly partition wall.
8. Release engine wiring harness from electronics box.
9. Drain coolant. Refer to «17 00 005 DRAINING OFF AND TOPPING UP COOLANT (M54)»(/bmw/x3/e83-2003-2006/remont/cooling-system-mechanical/#cooling-system-repair-instructions-m54__17-00-005-draining-off-and) .
10. Remove radiator. Refer to «17 11 000 REMOVING AND INSTALLING RADIATOR (M54)»(/bmw/x3/e83-2003-2006/remont/cooling-system-mechanical/#cooling-system-repair-instructions-m54__17-11-000-removing-and-installing) .
11. Remove A/C compressor drive belt. Refer to «11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-28-050-replacing-ac-compressor) .
12. Remove alternator drive belt. Refer to «11 28 010 REPLACING ALTERNATOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-28-010-replacing-alternator-drive) .
13. Disconnect fuel line (feed).
14. Remove front/middle underbody protection. Refer to «51 47 ... REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT UNDERBODY PANELING»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-47-removing-and-installingreplacing) and «51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-47-490-removing-and-installingreplacing) .
15. Remove reinforcement plate.
16. Remove exhaust system. Refer to «18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)»(/bmw/x3/e83-2003-2006/remont/exhaust/#exhaust-system-repair__18-00-020-removing-and-installing) .
17. Remove transmission. Refer to «REMOVAL & INSTALLATION - X3 (GS6-37BZ)»(/bmw/x3/e83-2003-2006/remont/manual-trans/#removal-installation-gs6-37bz) or «REMOVAL & INSTALLATION (A5S 360R/390R)»(/bmw/x3/e83-2003-2006/remont/automatic-trans/#removal-installation-a5s-360r390r) .
18. Remove oxygen sensors (monitor). Refer to «11 78 611 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 1-3)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-611-replacing-oxygen-monitor) and «11 78 612 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 4-6)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-612-replacing-oxygen-monitor) .

Detach vacuum line (1) from vacuum accumulator.

Scheme 56

Note. Automatic transmission only

Release transmission fluid line screw (1) on engine oil sump.

Scheme 57

Release fuel line (1).

Scheme 58

Seal off fuel line with special tool 13 5 280.

Recycling

Catch and dispose of escaping fuel in a suitable container.

Observe country-specific waste-disposal regulations.

Disconnect all plug connections on windscreen washer fluid reservoir (1).

Scheme 59

Press windscreen washer fluid reservoir (1) in direction of arrow upwards.

Secure windscreen washer fluid reservoir (1) with a cable tie (2).

Remove special tool 11 0 250.

Remove tension strut (1).

Scheme 60

Secure engine wiring harness (2) on engine against falling out. Mount special tool 11 0 020 on engine.

Scheme 61

Only raise engine at the suspension lugs (1) provided for this purpose.

Release grounding strap (1) on right engine support arm. Unscrew nut (3).

Scheme 62

Release nut (1) on left engine support arm.

Scheme 63

Note. Automatic only: Raise engine approx. 10 cm. Release screws (1). Remove transmission fluid lines (2).

Scheme 64

Installation

Reinstall the transmission fluid lines in reverse sequence to prevent damaging them during installation.

Remove engine carefully .

Assemble engine.

Fill cooling system and check for leaks. Refer to 17 00 005 DRAINING OFF AND TOPPING UP COOLANT (M54) .

Check engine oil level.

Securing engine with special tool in installation position (M54)

Special tools required

1. 00 0 200
2. 00 0 201
3. 00 0 202
4. 00 0 203
5. 00 0 204
6. 11 0 208
7. 11 0 020

Necessary preliminary tasks

1. Remove lower section of microfilter housing.
2. Remove cover for cowl panel. Refer to «51 13 115 REMOVING AND INSTALLING/REPLACING COWL PANEL COVER»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-13-115-removing-and-installingreplacing) .
3. Remove air cleaner housing.
4. Secure engine hood in service position. Refer to «51 00 ... SERVICE POSITION OF ENGINE HOOD»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-00-service-position-of) .

Assemble special tool 00 0 200 with special tools 00 0 201 / 00 0 202 / 00 0 203 / 00 0 204 / 00 0 208 and fit.

Scheme 65

Secure special tool 11 0 020 to the designated suspension eyes at front and rear only.

Note. The supports of special tool 00 0 208 must rest on the bolt connection of both side walls . Risk of damage .

Tighten the screws (1 and 2).

Scheme 66

Release engine mounts at top left and right.

Scheme 67

Raise engine with special tool 00 0 200 approx. 10 mm

max. 30 mm - risk of damage. .

11 12 000 Removing and installing, sealing cylinder head cover (M52TU / M54 / M56)

Remove engine cover.

Remove ignition coils. Refer to 12 13 511 REPLACING IGNITION COILS (M54) .

Remove wiring harness of ignition coils from cylinder head cover and place to one side.

Note. Illustration on M54 engine.

Press lock.

Scheme 68

Pull off the hose for the engine breather.

Remove grounding straps (1).

Scheme 69

Remove cylinder head cover.

Installation

Remove sealing debris from sealing faces of cylinder head and cylinder head cover.

Scheme 70

Apply a sealing bead of Drei Bond 1209 (refer to BMW Parts Service) on left and right sides at transition between cylinder head and VANOS adjustment unit.

Installation

Apply a thin and even sealing bead of Drei Bond 1209 (refer to BMW Parts Service) at transition to half-moon sections at VANOS adjustment unit.

Scheme 71

Note. Illustration with engine removed.

Installation

Apply a thin and even sealing bead of Drei Bond 1209 (refer to BMW Parts Service) at transition to half-moon sections at rear of cylinder head.

Scheme 72

Check seals and replace if necessary.

Note. Illustration with engine removed.

Installation

Make sure gasket is correctly seated on rear and front ends of cylinder head.

Scheme 73

Install cover bolts and align cylinder head cover.

Hand-tighten all cover bolts without preload. Tighten cap nuts crosswise from inside to outside.

11 12 100 Removing and installing/replacing cylinder head (M52TU / M54 / M56)

Special tools required

1. 00 0 200
2. 00 9 120

Remove both exhaust manifolds, refer to 11 62 140 REMOVING AND INSTALLING BOTH EXHAUST MANIFOLDS WITH CATALYTIC CONVERTERS (M52TU / M54 / M56) .

Note. After removing exhaust manifolds

Reinstall engine support arm with engine mount and remove special tool 00 0 200.

Remove intake filter housing with air-mass flow sensor. See 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .

Remove cylinder head cover, refer to 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56) .

Remove all spark plugs. See 12 12 011 REPLACING ALL SPARK PLUGS .

Remove intake air manifold, refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .

Remove coolant drain plug in engine block. Drain and dispose of coolant.

Installation

Replace sealing ring on drain plug.

Tightening torque: 25 N.m.

Vent cooling system and check for leaks, refer to 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (M54/M56) .

Remove coolant thermostat housing, refer to 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (M52TU / M54 / M56) .

Remove coolant pipe.

Note. If the coolant pipe cannot be fed out

Release banjo bolt (1) and disconnect oil pressure line for VANOS adjustment unit.

Scheme 74

Installation

Replace O-ring on coolant pipe.

If necessary, replace sealing rings on banjo bolt (1).

Tightening torque of banjo bolt (1): 32 N.m.

Removal

Removal of cylinder head is described separately from installation.

Remove double VANOS adjustment unit, refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Remove camshafts with bearing strips, refer to 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56) .

Release screw connection between timing case cover and cylinder head.

Scheme 75

Release screws, remove chain guide.

Scheme 76

Release cylinder head bolts from outside to inside in sequence 14 to 1.

Scheme 77

Lift off cylinder head.

Installation

Installation of cylinder head is described separately from removal.

Clean sealing faces of cylinder head and engine block; if necessary, remove traces of gasket with hardwood spatula. Make sure no gasket remnants drop into oil and cooling channels.

Check adapter sleeves for damage and correct installation position.

Scheme 78

Apply permanently elastic sealing compound Drei Bond 1209 to joints to timing case cover.

Replace cylinder head gasket.

Note. A cylinder head seal 0.3 mm thicker than usual can be obtained for machined (milled) cylinder heads.

Scheme 79

Use cylinder head bolts only once.

There must be no oil in the tapped holes of the engine block and the timing case cover.

Risk of cracking and distorted tightening values.

Put the cylinder head on.

Apply a light coat of oil to washer contact area and thread of new cylinder head bolts.

Tighten down cylinder head bolts in sequence 1 to 14.

Tightening torque; Jointing torque 30 N.m and an additional 90° and an 90°.

Scheme 80

Note. Use special tool 00 9 120 for torsion angle tightening.

Install chain guide.

Scheme 81

Insert screws and tighten down screw connection between timing case cover and cylinder head.

Scheme 82

Install camshafts, refer to 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56) .

Install double VANOS adjustment unit, refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Assemble engine.

11 12 101 Replacing cylinder head gasket (M52 / S52 / M52TU / M54 / M56)

Tasks are identical to REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56) .

11 12 503 Disassembling and assembling cylinder head (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 1 490
2. 11 0 192
3. 11 0 342
4. 11 0 343
5. 11 0 345
6. 11 1 045
7. 11 1 065
8. 11 1 067
9. 11 1 071
10. 11 1 441
11. 11 1 442

(cylinder head removed)

If necessary, remove coolant thermostat.

Screw on special tool 11 1 442.

Scheme 83

Screw special tool 11 1 065 onto special tool 00 1 490.

Scheme 84

Provide special tools for disassembling cylinder head

1. special tool 11 1 071
2. special tool 11 1 067
3. special tool 11 0 192
4. special tool 11 1 045
5. special tool 11 0 342
6. special tool 11 0343
7. special tool 11 0345
8. special tool 11 1 441

Scheme 85

Assemble special tools.

Note. Do not install special tool 11 1 441 (locating board) in special tool 11 1 065 at this stage.

Scheme 86

Place cylinder head on special tool 11 1 065 and screw on with two screws.

Scheme 87

Remove all valve springs. Refer to 11 34 715 REPLACING ALL VALVE SPRINGS (M52 / S52 / M52TU / M54 / M56) .

Remove all valve stem seals. Refer to 11 34 560 REPLACING ALL VALVE STEM SEALS (M52 / S52 / M52TU / M54 / M56) .

Remove all valves. Refer to 11 34 552 REMOVING AND INSTALLING OR REPLACING ALL VALVES (M52 / S52 / M52TU / M54 / M56) .

11 12 527 Remachining a valve seat (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 3 520
2. 00 3 580

(cylinder head dismantled)

Machine valve seat surface with special tool 00 3 520 or with special tool 00 3 580 in accordance with manufacturer's instructions.

Scheme 88

Note. After machining the valve seat surface, remachine the outside and inside diameters with a correction milling tool to the prespecified diameter to produce valve seat width (5).

Scheme 89

1. Valve-seat angle
2. Correction angle, outside
3. Correction angle, inside
4. Outside diameter seat face
5. Valve-seat width Specified values (1 to 5).

11 12 595 Checking a valve guide for wear (M52 / S52 / M52TU / M54 / M56)

(valve removed)

To measure tilt clearance, install a new valve so that end of valve stem is flush with valve guide.

Attach dial gauge and measure tilt clearance.

Scheme 90

Note. Max. permissible tilt clearance, refer to ENGINE - TECHNICAL DATA .

Note. If tilt clearance is excessive, valve guide is reamed out and a repair valve with a larger shaft diameter is installed.

Scheme 91

If necessary, ream valve guide. Refer to 11 12 600 REAMING A VALVE GUIDE (M52 / S52 / M52TU / M54 / M56) .

11 12 600 Reaming a valve guide (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 4 210

(valve removed)

Note. In event of excessive clearance between valve stem and valve guide: Valve guide is reamed and a repair valve with a larger stem diameter is installed.

Assemble reaming tool and guide taper (1) from special tool kit 00 4 210 depending on stem diameter. Press guide taper (1) onto valve seat. Starting from combustion chamber side, ream valve guide dry. Rotate reaming tool once in downwards direction.

Scheme 92

Note. Remachine valve seat after reaming. Refer to 11 12 527 REMACHINING A VALVE SEAT (M52 / S52 / M52TU / M54 / M56) .

11 12 719 Resurfacing cylinder head sealing surface (M52 / M52TU / M54 / M56)

(cylinder head dismantled)

Check flatness of cylinder head sealing surface with a commercially available straightedge.

Scheme 93

Deviation from flatness max. 0.05 mm.

Note. Machining limit. Refer to ENGINE - TECHNICAL DATA .

Scheme 94

Note. For compression comparison check, a repair cylinder head seal is provided.

Scheme 95

11 12 729 Checking cylinder head for watertightness (M52TU / M54 / M56)

Special tools required

1. 11 7 390
2. 11 7 391
3. 11 7 392
4. 11 7 393
5. 11 7 394
6. 11 7 395
7. 11 7 396
8. 11 7 397
9. 11 7 398

(cylinder head dismantled

Prepare special tool kit 11 7 390.

Note. Special tool kit in 390 consists of special tools 11 7 391 / 11 7 392 / 11 7 393 / 11 7 394 / 11 7 395 / 11 7 396 / 11 7 397 / 11 7 398.

Place special tools 11 7 391 / 11 7 392 on cylinder head sealing surface and screw down with cylinder head bolts.

Scheme 96

Turn back screw (1).

Scheme 97

Note. special tool 11 7 394 is secured with a pin (2).

Fit special tool 11 7394.

Insert screw (1) by hand until special tool 11 7 393 rests on sealing surface.

Scheme 98

Tighten down screw (1) by approx. a half to one turn.

Check sealing rings (1) and coat with water as anti -friction coating. Insert special tool 11 7 395 and tighten down.

Scheme 99

Seal coolant apertures with special tool kit 11 7 390.

Scheme 100

Connect compressed air to special tool 11 7 395.

Scheme 101

Immerse cylinder head in a water bath. Inspection pressure 4.5 bar.

Check cylinder head for escaping air (cracks).

Note. If necessary, soften the bath water with a cleaning agent.

11 13 000 Removing and installing, sealing or replacing oil sump (M52TU / M54 / M56)

Special tools required

1. 00 0 200
2. 00 0 201
3. 00 0 202
4. 00 0 204
5. 00 0 208

Note. To remove the oil sump, you must lower the front axle support. There is no need to perform a front axle alignment check.

Assemble special tool 00 0 200 with special tools 00 0 201 / 00 0 202 / 00 0 208 and fit.

Scheme 102

Secure special tool 00 0 200 to front suspension eye on engine.

Note. The supports (1) of special tool 00 0 208 must rest on the bolt connection of both side walls.

Tighten the screws (1 and 2).

Scheme 103

Raise engine with special tool 00 0 200 approx. 5 mm.

Scheme 104

Remove suction filter housing.

Remove engine splash guard.

Drain engine oil. Refer to 00 00 250 BMW ENGINE OIL SERVICE INCL. SUPPLEMENTARY SERVICE (M54 / M56) .

On vehicles with automatic transmission

Disconnect oil lines from automatic transmission and from oil pan.

Release guide tube for dipstick.

Scheme 105

Note. M52TU and M54 only.

Detach return hose from cyclone oil separator on oil dipstick guide tube.

Remove oil dipstick guide tube upwards.

Installation

Replace O-ring.

Scheme 106

Remove front end reinforcement.

Detach steering spindle from steering gear.

Remove vane pump for power steering unit (lines remain connected).

Disconnect plug connection to oil level sensor.

Loosen top and unfasten bottom of left and right engine mounts.

Scheme 107

E46 4WD only

Remove left and right swivel bearings.

Remove output shafts.

Remove front propeller shaft.

Remove front axle differential.

Detach brackets for left and right control arms from engine carrier. Release retaining brackets for left and right stabilizer bars. Unfasten screw connection on front axle support and lower the front axle support.

These operations are described in the work step Replacing front axle support.

Note. There is no need to detach the steering gear from the front axle support.

Unfasten oil sump screws at transmission and engine ends. Lower and remove oil sump.

Scheme 108

Installation

Sealing faces clean and free of seal debris.

Apply approx. 3 mm wide, 2 mm high coat of Drei Bond 1209 sealing agent (refer to BMW Parts Service) to the area around seams.

Scheme 109

Installation

1. Replace gasket
2. Install oil sump.
3. Insert all oil sump screws.
4. Insert screws in transmission end without preload at this stage.
5. Tighten down screws in engine end.
6. Tighten down screws in transmission end.

11 13 000 Removing and installing, sealing/replacing oil sump (M54/56)

Necessary preliminary tasks

1. Drain engine oil. Refer to «00 00 250 BMW ENGINE OIL SERVICE (M54/56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__00-00-250-bmw-engine-oil) .
2. Remove front left and right output shafts.
3. Remove front axle differential. Refer to 31 50 001 Removing and installing/replacing front differential .
4. Release vane pump for power steering (lines remain connected). Refer to 32 41 060 Removing and installing/replacing vane pump for power steering (M54) .
5. Remove oil dipstick. Refer to «11 43 000 REMOVING AND INSTALLING/REPLACING OIL DIPSTICK (M54/56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-43-000-removing-and-installingreplacing) .
6. Secure engine in installation position. Refer to «SECURING ENGINE WITH SPECIAL TOOL IN INSTALLATION POSITION (M54)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__securing-engine-with-special-tool-in) .
7. Detach steering spindle from steering gear. Refer to «LOWER SECTION OF STEERING SPINDLE»(/bmw/x3/e83-2003-2006/remont/steering-column/#steering-column__lower-section-of-steering-spindle) .
8. Lower front axle. Refer to «FRONT AXLE CARRIER»(/bmw/x3/e83-2003-2006/remont/suspension-front/#front-suspension__front-axle-carrier) . (Front axle alignment is not required).
9. Disconnect plug connection on oil level sensor.
10. Remove oil lines for automatic transmission.

Release oil sump screws along line (1).

Scheme 110

Installation

Tightening torque: 11 13 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Move oil pan backwards.

Release transmission screws (1).

Scheme 111

Automatic transmission: Tightening torque, refer to TORQUE SPECIFICATIONS .

Manual transmission: Tightening torque, refer to TORQUE SPECIFICATIONS .

Installation

Clean sealing surfaces.

Scheme 112

In area of joint, apply approx. 3 mm of Drei Bond 1209 sealing compound (refer to BMW Parts Service)

Assemble engine.

Check engine for leaks.

11 14 110 Removing and installing lower timing case cover (M52 / S52 / M52TU / M54)

Remove VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Remove coolant thermostat. Refer to 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (M52TU / M54 / M56) .

Remove alternator drive belt and drive belt tensioner.

Brace pulley for water pump with drive belt and unfasten screws.

Scheme 113

M52/S52 only

Unfasten engine speed sensor.

Scheme 114

Remove vibration damper. Refer to 11 23 010 REMOVING AND INSTALLING OR REPLACING VIBRATION DAMPER (M52TU / M54 / M56) .

Version where vibration damper and hub are two parts: Remove hub for vibration damper.

Remove oil sump. Refer to 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (M52TU / M54 / M56) .

Drive out dowel pins from timing case cover towards rear. (Mandrel diameter less than 5 mm)

Scheme 115

Unscrew timing case cover to cylinder head bolts.

Scheme 116

Unfasten screws and remove timing case cover.

Scheme 117

Installation

Clean sealing surfaces.

Scheme 118

Drive alignment pins into timing case cover until they protrude approx. 2 to 3 mm.

Installation

Secure new seals to timing case cover with a little grease.

Scheme 119

Installation

Sealing faces clean and free of seal debris.

Apply Drei Bond 1209 sealing compound (refer to BMW Parts Service) at following points

Scheme 120

1. A bead at the transitions to the cylinder head gasket on the left and right.
2. Thinly and evenly to the entire sealing face of the timing case cover to the cylinder head gasket.

Installation

Install timing case cover, insert all screws and initially tighten to approx. 5 N.m.

Scheme 121

Installation

Drive in dowel pins from front until flush.

Scheme 122

Installation

Fully tighten all screws in alternate sequence.

Scheme 123

Tightening torque, 11 14 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Insert screws, tighten screw connection for timing case cover to cylinder head.

Scheme 124

Replace radial seal in lower timing case cover. Refer to 11 14 141 REPLACING RADIAL SEAL IN LOWER TIMING CASE COVER .

Assemble engine.

11 14 141 Replacing radial seal in lower timing case cover

Special tools required

1. 11 2 380
2. 11 2 383
3. 11 2 385
4. 11 3 280

Note. This repair instruction is valid for the following engines: M50/M52/M52TU/M54/M56 S52

Remove vibration damper. Refer to 11 23 010 REMOVING AND INSTALLING OR REPLACING VIBRATION DAMPER (M52TU / M54 / M56) .

Note. Version where vibration damper and hub are two parts: Remove hub for vibration damper.

Fit special tool 11 2 383 to crankshaft.

Scheme 125

Fit special tool 11 2 385 to crankshaft.

Scheme 126

Align groove of special tool 11 2 385 to featherkey of crankshaft.

Note. Special tool 11 2 385 centers special tool 11 2 380.

Screw in special tool 11 2 380 until it has made firm contact with radial seal.

Scheme 127

Remove radial seal by tightening screw on special tool.

Installation

Coat sealing lips of new radial sealing ring with oil.

Using special tool 11 3 280 and centering screw, install new radial seal flush with timing case cover.

Scheme 128

11 14 151 Replacing crankshaft radial seal (transmission side)

Note. This repair instruction is valid for the following engines

1. M40 / M42 / M43 / M43TU / M44
2. M50/M52/M52TU/M54/M56
3. S52 / S54

Necessary preliminary tasks

1. Remove gearbox
2. Drain off engine oil
3. Remove flywheel

Unfasten oil sump screws on transmission end.

Scheme 129

Loosen oil pan.

Release screws in end cover at rear.

Scheme 130

Carefully detach oil sump gasket from end cover, remove end cover.

Note. After removing end cover: check oil sump gasket for damage. If necessary, remove oil sump and replace oil sump gasket.

Note. As from 4/98, a new type of radial seal is used in the Series and as a replacement. This radial seal may only be supported with a "support bushing". If the radial seal is supported without the support bushing (1) for more than six months, operational reliability will no longer be assured and the radial seal must not be used any further.

Scheme 131

Distinguishing feature

1. New version "without hose spring"
2. Old version "with hose spring"

Note. The end cover is offered in the kit with a radial seal.

If necessary, lift out the radial sealing ring and drive in new sealing ring using special tool 11 1 260 in conjunction with special tool 00 5 500.

Scheme 132

Check dowel sleeves (1) for damage and correct installation position.

Scheme 133

Replace seal (2).

Apply thin, uniform coat of Drei Bond 1209 sealing compound (refer to BMW Parts Service) to edges of joint on oil pan.

Scheme 134

Note. When fitting the end cover with radial seal on the crankshaft, it is only permitted to use the "support bushing (1)" as an installation tool.

Scheme 135

Lubricate contact face of crankshaft.

Note. Screw threads (1) are coated with sealing compound.

Replace screws (1).

Scheme 136

Insert all screws and tighten down end cover.

Note. Keep the support bushing (1) of the new radial seal version as a "special tool", then render the special tool 11 2 213 unusable and dispose of it.

The old and new radial seal versions can be installed with the support bushing (1).

Scheme 137

11 21 500 Replacing crankshaft (M52 / S52 / M52TU / M54 / M56)

(engine removed)

Necessary preliminary tasks

1. Removing cylinder head
2. Removing lower timing case cover
3. Removing all pistons, refer to «11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-25-530-removing-and-installing)
4. Remove end cover at rear; this operation is described in the section Replacing crankshaft radial seal. Refer to «11 14 151 REPLACING CRANKSHAFT RADIAL SEAL (TRANSMISSION SIDE)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-14-151-replacing-crankshaft-radial) .

Checking axial clearance

Scheme 138

If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary.

End float, refer to ENGINE - TECHNICAL DATA

Unfasten screw connection on reinforcement plates.

Scheme 139

Note. The reinforcement plates are not fitted on engines with gray cast iron engine blocks or on engines with oil pumps integrated in oil scrapers.

Unfasten screw connection on main bearing.

Scheme 140

Remove main bearing caps (1 to 7).

Lever out crankshaft.

If necessary, release incremental gear.

Installation

Replace screws.

Install screws and tighten down in two passes.

Tightening torque 11 21 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Scheme 141

Replace main crankshaft bearing shells. Refer to 11 21 531 REPLACING ALL MAIN CRANKSHAFT BEARING SHELLS (M52 / S52 / M52TU / M54 / M56) .

Replace conrod bearing shells. Refer to 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (M52 / S52 / M52TU / M54 / M56) .

Replace grooved ball bearings in crankshaft. Refer to 11 21 571 REPLACING GROOVED BALL BEARING IN CRANKSHAFT (M52 / S52 / M52TU / M54 / S50 / S54) .

11 21 531 Replacing all main crankshaft bearing shells (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 2 590
2. 00 9 120
3. 11 2 110

(engine dismantled)

M52 B20/M52TU B20 M54 M22

Note. Injection nozzles for cooling the pistons are installed in the bores of bearing seats 2 to 7.

Scheme 142

M52 B25/B28 S52 M52TU B25/B28 M54 B25/B30 M56

Note. Injection nozzles for cooling the pistons are installed on the underside of the cylinder between the bearing seats.

Scheme 143

Installation

Screw threads are coated with screw securing adhesive (Loctite).

Replace screws.

Scheme 144

Installation

When replacing the bearing shells (also for replacement crankshaft), classification for bearing shell arrangement in engine block is waived.

Insert bearing shells with yellow color coding in engine block.

Scheme 145

Note. Install bearing shells with continuous lubricant groove and one retaining lug in engine block. Fit bearing shells without continuous lubricant groove and two retaining lugs in bearing cover.

Note. The axial guide on the crankshaft is fitted to bearing point 6. Insert pilot bearing shell in the engine block.

Scheme 146

Install crankshaft.

Note. The crankshaft is marked with yellow, green or white paint according to the tolerance of the main journal.

Scheme 147

Installation

The bearing shell classification for the bearing cover is marked on the crankshaft in yellow, green or white paint.

Scheme 148

Insert main bearing shells with same crankshaft color coding in main bearing caps.

The bearing shells are marked with yellow, green or white paint.

Scheme 149

1. Bearing shell
2. Guide bearing Observe grinding stage of main bearing journals. Refer to «ENGINE - TECHNICAL DATA»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-technical-data-m54) .

Note. Bearing caps 1 to 5 are marked on exhaust side. Bearing caps 6 and 7 are not designated. Bearing cap 6 is a thrust bearing.

Scheme 150

Check clearance on main crankshaft bearing.

Scheme 151

Install crankshaft and place special tool 00 2 590 (Plastigage Type PG1) on oil-free crankshaft. Do not twist crankshaft.

Install main bearing cap so that grooves in main bearing shell guide are on one side. Align main bearing cap flush with side of bearing seat.

Scheme 152

Installation

To check main bearing clearance, use the old main bearing screws. There must be no oil in the blind holes (risk of cracking).

1. Tighten down main bearing screws with jointing torque.
2. Tighten down main bearing bolts with special tool 00 9 120 to angle of rotation.

Tightening torque, 11 11 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Remove main bearing cap and read off bearing clearance at width of pinched plastic thread on measuring scale.

Scheme 153

Radial crankshaft bearing clearance, refer to ENGINE - TECHNICAL DATA .

If necessary, to correct bearing clearance, fit new bearing shells with a different color coding.

Remove plastic thread. Coat main bearing shells and crankshaft with engine oil.

Install main bearing cap so that grooves in main bearing shell guide are on one side.

Align main bearing cap flush with side of bearing seat.

Installation

Always replace bolts of main bearing cap with new bolts. There must be no oil in the blind holes (risk of cracking).

Note. The reinforcement plates are not fitted on engines with gray cast iron engine blocks or on engines with oil pumps integrated in oil scrapers.

Scheme 154

Installation

Install reinforcement plates and fit screws with zero backlash. Install main bearing shells and abut firmly. Tighten down screw connection on reinforcement plates.

Tightening specifications for main bearing

1. Tighten all screws on main bearing cover with jointing torque.
2. Unfasten screws on main bearing cover 6.
3. Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).
4. Tighten screws of main bearing cover 6 with jointing torque.
5. Tighten down all screws of main bearing caps with special tool 11 2 110 or with special tool 00 9 120 to torsion angle.

Tightening torque, 11 11 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Check axial play. If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary.

Scheme 155

End float, refer to ENGINE - TECHNICAL DATA .

11 21 571 Replacing grooved ball bearing in crankshaft (M52 / S52 / M52TU / M54 / S50 / S54)

Special tools required

1. 00 5 500
2. 11 2 340
3. 11 2 350

(clutch removed)

Scheme 156

Version with grooved ball bearing

Remove guide bearing with special tool 11 2 340.

Scheme 157

Install new thrust bearing and drive firmly home with special tool 11 2 350 in conjunction with special tool 00 5 500.

Scheme 158

Special tools required

1. 11 2 170

(clutch removed)

Lock flywheel with special tool 11 2 170.

Scheme 159

Unfasten screws and remove flywheel.

Scheme 160

Installation

Check dowel sleeve for damage and correct installation position.

Scheme 161

Installation

Position of dowel sleeve (1) in dual-mass flywheel is identified by two notches next to associated bolt hole.

Scheme 162

Installation

Clean thread and install new micro-encapsulated screws.

Scheme 163

Tightening torque 11 22 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

11 22 500 Removing and installing/replacing flywheel (M54)

Special tools required

1. 11 4 180
2. 11 9 260
3. 11 9 265

Necessary preliminary tasks

1. Remove exhaust system. Refer to «18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)»(/bmw/x3/e83-2003-2006/remont/exhaust/#exhaust-system-repair__18-00-020-removing-and-installing) .
2. Remove transmission. Refer to «REMOVAL & INSTALLATION - X3 (GS6-37BZ)»(/bmw/x3/e83-2003-2006/remont/manual-trans/#removal-installation-gs6-37bz) or «REMOVAL & INSTALLATION (A5S 360R/390R)»(/bmw/x3/e83-2003-2006/remont/automatic-trans/#removal-installation-a5s-360r390r) .
3. Remove clutch (manual transmissions only). Refer to «CLUTCH»(/bmw/x3/e83-2003-2006/remont/clutches-manual-hydraulic/#clutch-repair) .

Note. Automatic transmissions only

Secure flywheel with transmission screw (1) and special tools 11 9 260 and 11 9 265. Unfasten flywheel screws.

Scheme 164

Tightening torque: 11 22 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Note. Manual transmissions only

Secure flywheel with transmission screw (1) and special tools 11 9 260 and 11 9 265. Release flywheel screws with special tool 11 4 180.

Scheme 165

Tightening torque: 11 22 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

Check dowel sleeves for damage and firm seating.

Assemble engine.

11 22 513 Replacing roller bearing for dual-mass flywheel

Special tools required

1. 21 2 051
2. 21 2 052

Note. Flywheel removed!

Using hydraulic press (1) and special tool 21 2 051, press out dual-mass flywheel downwards on engine side.

Scheme 166

Roller bearing must not be driven out.

Push roller bearing (2) onto special tool 21 2 052.

Scheme 167

Using hydraulic press (1), press roller bearing into dual-mass flywheel as far as it will go on clutch side.

Observe press-in instruction

1. Roller bearing must not be driven in.
2. Roller bearing mounting force/travel monitored: Min. 2000N 1 mm before end of pressing in. Max. 15000N during entire press-in procedure.

11 23 010 Removing and installing or replacing vibration damper (M52TU / M54 / M56)

Special tools required

1. 11 8 190
2. 11 8 200
3. 11 8 210

Necessary preliminary tasks

1. Unscrew and remove splash guard
2. Remove fan impeller with fan clutch and fan cowl
3. E83/E85/E60: Remove fan cowl with electric fan
4. Remove A/C compressor drive belt, refer to «11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-28-050-replacing-ac-compressor)
5. Remove alternator drive belt, refer to «11 28 010 REPLACING ALTERNATOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-28-010-replacing-alternator-drive)

Protect cooler against damage.

Version 1

Vibration damper and hub for vibration damper are two parts: Unscrew vibration damper bolts and take off vibration damper.

Scheme 168

Version 1

Vibration damper and hub for vibration damper are two parts

Installation

Align locating bore in vibration damper to dowel pin.

Scheme 169

Install and tighten down screws.

Tightening torque 11 23 3AZ. Refer to ENGINE - TIGHTENING TORQUES .

Version 2

Vibration damper and hub for vibration damper are one part

Screw special tool 11 8 190 to special tool 11 8 200.

Scheme 170

Version 2

Note. Special tool 11 8 200 must snap into place in openings (1).

Scheme 171

Version 2

When releasing and tightening down central bolt, grip special tool 11 8 190 with assistance of a second person.

Version 2

Insert special tool 11 8 200 in openings on vibration damper and turn counterclockwise so that counter-supports snap into place on vibration damper.

Scheme 172

Release central screw (1).

Version 2

Feed out special tools 11 8 190/ 11 8 200.

Scheme 173

Remove central screw and washer.

Carefully detach vibration damper (1) by hand.

Version 2

Note. If vibration damper cannot be detached by hand

Insert special tool 11 8 200 in openings on vibration damper and turn clockwise so that counter-supports snap into place on vibration damper.

Scheme 174

Version 2

Screw out spindle (1) on special tool 11 8 210 as far as possible.

Scheme 175

Version 2

Protect cooler against damage.

Carefully install special tool 11 8 210.

Screw special tool 11 8 210 to special tool 11 8 200.

Detach vibration damper by turning spindle (1) on special tool 11 8 210.

Scheme 176

Version 2

Installation

Check featherkey (1) for damage and correct installation position.

Scheme 177

Replace radial seal in lower timing case cover. Refer to 11 14 141 REPLACING RADIAL SEAL IN LOWER TIMING CASE COVER .

Version 2

Installation

Align groove (1) in vibration damper to featherkey.

Scheme 178

Fit vibration damper.

Version 2

Installation

Replace central screw (1).

Scheme 179

Install central screw and washer.

Version 2

Installation

Screw special tool 11 8 190 to special tool 11 8 200.

Scheme 180

Version 2

Insert special tool 11 8 200 in openings on vibration damper and turn clockwise so that counter-supports snap into place on vibration damper.

Scheme 181

Tighten down central screw (1).

Tightening torque, 11 23 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

11 24 571 Replacing all connecting rod bearings (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 2 590
2. 00 9 120
3. 11 2 110

(piston removed)

Install new conrod bearing shells.

Insert one blue (1) and one red (2) bearing shell (irrespective of the color coding on the conrod shaft).

Scheme 182

Install piston. Refer to 11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (M52 / S52 / M52TU / M54 / M56) .

Check conrod bearing clearance.

Piston in BDC position.

Fit special tool 00 2 590 (Plastigage Type PG 1) to oil -free crankshaft.

Scheme 183

Fit bearing caps so that pair numbers match up.

Use the old conrod bolts to check conrod clearance.

Scheme 184

Tighten down conrod bolts with special tool 00 9 120 or with special tool 11 2 110.

Tightening torque 11 24 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Remove bearing cap and read off bearing play at width of flattened plastic thread with assistance of measurement scale.

Scheme 185

Conrod bearing clearance, refer to ENGINE - TECHNICAL DATA .

1. Remove plastic thread.
2. Coat crankshaft and bearing shells with oil.
3. Install new conrod bolts and tighten down. Tightening torque 11 24 1AZ. Refer to «ENGINE - TIGHTENING TORQUES»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-tightening-torques-m54) .

11 25 530 Removing and installing or replacing all pistons (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 00 9 120
2. 11 2 110
3. 11 2 260
4. 11 2 470
5. 11 3 480
6. 11 8 141

(engine removed) Remove cylinder head.

Removal of pistons is described separately from installation. Assembly sequence for removal and installation is different.

Remove oil pump. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56) .

If oil pump and oil scraper are two parts: Remove oil scraper.

Scheme 186

Note. Figure shows crankshaft removed.

Scheme 187

On engines with spray nozzles for piston cooling on cylinder underside

Installation

Screw threads are coated with screw securing adhesive (Loctite). Replace screws.

In event of heavy oil carbon residue

Carefully remove oil carbon residue from cylinder wall.

Scheme 188

Unscrew conrod bearing cover.

Scheme 189

Insert special tool 11 3 480 in conrod.

Scheme 190

Remove conrod with piston from cylinder head side.

Lift out retaining ring and press out piston pin.

Scheme 191

Installation of pistons is described separately from removal. The assembly sequence differs between removal and installation.

The piston pin must be able to be pressed through the liner by hand with little force and must not display any significant play.

Scheme 192

Measure piston installation clearance

Measure piston diameter with micrometer at distance A from the underside of the piston and at offset angle of 90° to piston pin axis.

Scheme 193

Measurement A, refer to ENGINE - TECHNICAL DATA .

Adjust micrometer to cylinder bore of engine block, set internal caliper on micrometer to zero. Measure bottom, center and top of cylinder bore in direction of travel and direction of engine rotation.

Scheme 194

Diameter of cylinder bore, refer to ENGINE - TECHNICAL DATA .

Piston installation clearance, refer to ENGINE - TECHNICAL DATA .

Total permissible wear tolerance, refer to ENGINE - TECHNICAL DATA .

Replace conrod bearing shells. Refer to 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (M52 / S52 / M52TU / M54 / M56) .

Fit conrod with piston pin to piston in such a way that both of the visible pair numbers on the installation direction arrow on the piston point to the right.

Scheme 195

Install snap ring so that opening is opposite recess.

Scheme 196

Insert special tool 11 2 470 in conrod.

Scheme 197

Lightly coat pistons and piston rings with oil.

Align contact points on piston rings (offset at approx. 120°, but do not arrange over piston pin lug).

Note. Piston diameter 84 mm: Use special tool 11 8 141.

Piston diameter 80 mm

Press together piston rings with special tool 11 2 260.

Scheme 198

Install piston so that arrow points to camshaft drive.

Scheme 199

Entire circumference of tightening strap must rest firmly on engine block.

Press in piston only with finger force (do not knock in!).

Attach crankpin to connecting rod.

Scheme 200

Apply light coat of oil to connecting -rod bearing shells. Fit bearing caps so that pair numbers match up. Install new conrod bolts.

Scheme 201

Tighten down conrod bolts with special tool 00 9 120 or special tool 11 2 110.

Scheme 202

Tightening torque 11 24 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Install oil pump. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56) .

If oil pump and oil scraper are two parts

Fit oil scraper.

Scheme 203

Assemble engine.

11 25 671 Replacing piston rings on all pistons (M52 / S52 / M52TU / M54 / M56)

(piston removed)

Remove piston rings with a piston-ring compressing pliers.

Scheme 204

Note. It might not be possible to find the identification on used piston rings. Put aside piston rings in correct sequence and installation position. Only install new pistons in conjunction with new piston rings.

Installation

Install piston rings with "TOP" to piston top.

Scheme 205

1. Plain compression ring
2. Stepped compression ring "Top"
3. Slotted oil ring with hose spring clip

Measure axial play, refer to ENGINE - TECHNICAL DATA .

Scheme 206

Measure end clearance, refer to ENGINE - TECHNICAL DATA .

Scheme 207

11 28 010 Replacing alternator drive belt (M52 / S52 / M52TU / M54 / M56)

Note. If the drive belt is to be subsequently reused: Mark direction of travel and reinstall drive belt in same direction of travel.

Necessary preliminary tasks

1. Remove fan clutch with fan impeller
2. Remove A/C compressor drive belt, refer to «11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-28-050-replacing-ac-compressor)

Remove cap from tensioning roller.

Scheme 208

Relieve tension on belt drive.

Scheme 209

Remove drive belt.

Installation

Check drive belt for coolant and oil residues, replace if necessary.

Installation

Check that belt is correctly positioned on belt pulleys.

Scheme 210

Version with auxiliary tensioning roller.

Scheme 211

Installation

Locking device of auxiliary tensioning roller must snap into groove on alternator.

Scheme 212

Version on E85.

Scheme 213

Version on E60/E65.

Scheme 214

11 28 050 Replacing A/C compressor drive belt (M52 / S52 / M52TU / M54 / M56)

Note. If the drive belt is to be subsequently reused: Mark direction of travel and reinstall drive belt in same direction of travel.

Necessary preliminary tasks

1. If necessary, remove splash guard.

Model with hydraulic drive belt and tension jack

Remove the dust cab. Push back belt tensioner at bolt connection of guide pulley and remove drive belt.

Scheme 215

Model with mechanical drive belt and tension jack

Press back drive belt tensioner at hexagon head or Torx socket and remove drive belt.

Scheme 216

Installation

Check drive belt for coolant and oil residues, replace if necessary.

Install drive belt, make sure it is correctly positioned on belt pulleys.

11 31 001 Replacing camshaft (M52TU / M54 / M56)

Special tools required

1. 00 9 250
2. 11 2 300
3. 11 3 240
4. 11 3 244
5. 11 3 250
6. 11 3 260
7. 11 3 292
8. 11 4 220
9. 11 6 150
10. 11 6 180

(if necessary inlet or exhaust side)

The inlet or exhaust camshaft can be replaced in the vehicle.

Removal of camshafts is described separately from installation. The assembly sequence for removal and installation is different.

Remove VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Unfasten cylinder for chain tensioning piston.

Scheme 217

Press down secondary chain tensioner at top and lock with special tool 11 3 292.

Scheme 218

Release nuts, remove sensor gear (1).

Scheme 219

Remove plate spring (2).

Scheme 220

Release nuts on inlet side and remove corrugated washer (7).

Scheme 221

Unfasten screws.

Scheme 222

Lift off exhaust and inlet chain wheels together with chain, friction washer (3) and toothed shaft (4).

Scheme 223

Note. Toothed shaft (4) is and identical part for exhaust and inlet sides. Store used toothed shafts in order and reinstall on the same side only.

Remove toothed shaft (5) with toothed sleeve (6).

Scheme 224

Unfasten screws. Remove secondary chain tensioner.

Scheme 225

Release screw-in pin.

Scheme 226

Feed chain wheel (1) towards front out of timing chain (2).

Scheme 227

Note. Timing chain remains positioned over exhaust camshaft.

Scheme 228

If necessary, release screw-in pin on inlet side. Remove thrust washer.

Scheme 229

Remove sensor gear.

Scheme 230

Scheme 231

Unscrew studs.

Scheme 232

Pull special tool 11 2 300 back until flywheel is no longer secured in position.

Scheme 233

Lift timing chain and hold under tension.

Rotate engine against direction of engine rotation approx. 30° using the central bolt.

Scheme 234

To prevent inlet camshaft from tilting in bearing strip, release nuts and remove bearing cap 1.

Scheme 235

Fit special tool 11 3 260 to cylinder head and screw into spark plug threads in cylinders 1 and 4.

Scheme 236

Turn the eccentric shaft to tension the bearing caps. Unfasten nuts on bearing cover.

Scheme 237

Relieve tension on eccentric shaft and remove special tool 11 3 260.

Remove bearing covers and place to one side in orderly fashion. Remove camshaft.

Scheme 238

Note. If the cylinder head is then to be removed, remove complete bearing strip with bucket tappets.

Locate bucket tappets in bearing strip with special tool 11 3 250. Lift out complete bearing strip with bucket tappet.

Scheme 239

Note. Only re-use used bucket tappets in the same tappet bore.

Check bearing points on bucket tappets for signs of wear (scoring).

Scheme 240

Bearing strips are marked "A" for exhaust side and "E" for inlet side.

Scheme 241

Note centering dowels on retaining pins at bearing points 2 and 7.

Install bearing strips.

Scheme 242

Installation of camshafts is described separately from removal. The assembly sequence for removal and installation is different.

Note. Camshafts, bearings and bearing caps, friction washers, all splines on toothed shafts and spline hubs must be oiled before installation.

Comply with following waiting periods after installing camshaft and before cranking engine back to TDC position.

1. Room temperature (20°C) 4 mins
2. 10°C ... 20°C 11 mins
3. 0°C ... 10°C 30 mins

Pull up timing chain and feed in exhaust camshaft. Position timing chain on exhaust camshaft.

Scheme 243

Install camshafts so that cam tips on inlet and exhaust valves on 1st cylinder face one another.

Scheme 244

Fit bearing cover.

Scheme 245

Note. Bearing caps are marked from exhaust side: A1 ... A7 for exhaust side, E1 ... E7 for inlet side.

Fit special tool 11 3 260 to cylinder head and screw into spark plug threads in cylinders 1 and 4.

Scheme 246

Turn the eccentric shaft to tension the bearing caps. Tighten down bearing cover.

Scheme 247

Tightening torque, 11 31 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Align camshafts with open-end wrench.

Scheme 248

Fit special tool 11 3 240 to camshafts on cylinder 6. Align camshafts so that special tool 11 3 240 rests without gaps on cylinder head.

Scheme 249

Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.

Scheme 250

Lift timing chain and hold under tension. Turn engine from 30° before TDC position in direction of rotation as far as TDC position.

Scheme 251

Secure crankshaft in firing TDC position with special tool 11 2 300.

Scheme 252

Automatic transmissions only

Illustration does not show automatic transmission.

If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.

Scheme 253

Position sensor gear on inlet camshaft.

Scheme 254

Fit thrust washer and tighten down with dowels.

Tightening torque 11 31 11AZ. Refer to ENGINE - TIGHTENING TORQUES .

Scheme 255

Feed chain wheel onto timing chain so that arrow on chain wheel faces separating face of upper side of cylinder head.

Scheme 256

Insert special tool 11 4 220 in cylinder head and bring adjustment screw into contact with tensioning rail, but do not pretension timing chain yet.

Scheme 257

Check arrow on chain wheel to separating face of upper side of cylinder head, reposition chain wheel if necessary.

Insert and tighten down screw-in pin.

Scheme 258

Tightening torque 11 31 11AZ. Refer to ENGINE - TIGHTENING TORQUES .

Install secondary chain tensioner.

Scheme 259

Fit toothed sleeve (6) and align to toothed shaft in camshaft so that tooth gaps are opposed.

Scheme 260

Secure toothed shaft (5).

Scheme 261

Insert pin of toothed shaft (5) into tooth gaps of splines on camshaft and toothed sleeve (6).

Push in toothed shaft (5) until the longitudinal holes in the toothed sleeve (6) are positioned centrally with respect to the thread.

Scheme 262

Place chain wheels in special tool 11 6 180, position tooth gap on inlet chain wheel as shown in illustration and feed on chain.

Scheme 263

Remove chain with sprocket wheels positioned from special tool 11 6 180 and so that tooth spaces oppose each other on inlet side.

Scheme 264

Align chain with sprocket wheels so that tooth spaces are positioned exactly over each other on inlet side.

Scheme 265

Secure toothed shaft (4).

Scheme 266

Insert pin of toothed shaft (4) into tooth gaps of splines on camshaft and chain wheel.

Push in toothed shaft (4) until approx. 1 mm of splines can still be seen.

Scheme 267

Note installation direction of corrugated washer (7), "FRONT" lettering must be visible.

Install corrugated washer, tighten nuts by hand but do not tighten down fully yet.

Scheme 268

Insert screws on exhaust side, initially tighten to approx. 5 Nm and then slacken off again half a turn.

Scheme 269

Fit thrust washer (3).

Scheme 270

Note installation direction of cup spring (2), "F" lettering must be visible.

Note. If "F" lettering is no longer visible on an engine that has been run

Scheme 271

Install cup spring (2) so that small locating diameter of spring (2) points to sensor gear.

Fit cup spring (2) in position.

Position sensor gear (1) so that arrow on sensor gear faces separating face of upper side of cylinder head.

Scheme 272

Install nuts and tighten by hand but do not tighten down fully yet.

Withdraw toothed shaft (5) up to stop.

Scheme 273

Press down secondary chain tensioner at top and remove special tool 11 3 292.

Scheme 274

Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 Nm.

Scheme 275

Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.

Scheme 276

Remove gasket.

Scheme 277

Check dowel sleeves (1) for damage and correct installation position.

Keep sealing face clean and free of oil.

If gasket remains underneath special tool 11 6 150, camshaft timing will be "incorrectly" set.

Attach special tool 11 6 150 "without gasket", tighten nuts by hand and then tighten down uniformly until special tool 11 6 150 is in full contact with cylinder head.

Scheme 278

Insert screws (1) on exhaust side and initially tighten to approx. 5 Nm.

Scheme 279

Initially tighten nuts (2) on exhaust side and nuts (3) on inlet side to approx. 5 Nm.

Scheme 280

Tighten down screws (1) on exhaust side.

Scheme 281

Tightening torque 11 31 3AZ. Refer to ENGINE - TIGHTENING TORQUES .

Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.

Scheme 282

Tightening torque 11 31 11AZ. Refer to ENGINE - TIGHTENING TORQUES .

Pull special tool 11 2 300 back until flywheel is no longer secured in position.

Scheme 283

Remove special tool 11 3 244 and special tool 11 3 240.

Scheme 284

Crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.

Scheme 285

Secure crankshaft in firing TDC position with special tool 11 2 300.

Scheme 286

Remove special tool 11 2 300 before switching on the engine.

Fit special tool 11 3 240 to camshafts.

Scheme 287

Note. The timing is correctly set if the special tool 11 3 240 rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side.

Scheme 288

The timing must be reset if the special tool 11 3 240 protrudes to the exhaust side.

Remove special tool 11 6 150.

Scheme 289

Install VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Assemble engine.

11 31 005 Checking camshaft timing (M52TU / M54 / M56)

Special tools required

1. 00 9 250
2. 11 2 300
3. 11 3 240
4. 11 3 450
5. 11 4 220

Necessary preliminary tasks

1. Remove fan impeller with fan clutch
2. E60: Remove fan cowl with electric fan
3. Remove cylinder head cover, refer to «11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-12-000-removing-and-installing)
4. Remove all spark plugs, refer to «12 12 011 REPLACING ALL SPARK PLUGS»(/bmw/x3/e83-2003-2006/remont/gauges-instrument-panels/#engine-electrical-system-repair-m54__12-12-011-replacing-all-spark)

Detach cover for inlet camshaft.

Scheme 290

Remove cylinder for chain tensioning piston.

Scheme 291

Install special tool 11 4 220.

Fit adjusting screw to bow cover.

Scheme 292

Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 N.m.

Scheme 293

Unscrew oil pressure pipe.

Scheme 294

Mount special tool 11 3 450 with banjo bolt of oil pressure line.

Scheme 295

Scheme 296

Connect compressed air (2 to 8 bar).

Scheme 297

Note. When the engine is switched off, it is possible that the camshafts are not in their initial positions. With the compressed air supply connected, rotate the engine to return the camshafts to their initial positions.

With compressed air supply connected, crank engine at least two revolutions in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.

Scheme 298

Pull dust guard out of the special tool bore.

Scheme 299

Secure crankshaft with special tool 11 2 300 in TDC firing position of 1st cylinder.

Scheme 300

Remove special tool 11 2 300 before starting engine.

Automatic transmissions only: Illustration does not show automatic transmission.

Scheme 301

If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.

Unscrew studs.

Scheme 302

Place special tool 11 3 240 on camshafts.

Scheme 303

Note. The timing is correctly set if the special tool 11 3 240 rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side. The timing must be reset if the special tool 11 3 240 protrudes to the exhaust side.

Scheme 304

If necessary, adjust camshaft timing. Refer to 11 31 505 ADJUSTING CAMSHAFT TIMING (M52TU / M54 / M56) .

Detach compressed air connection. Remove special tool 11 3 450.

Scheme 305

Fit oil pressure line with new seals.

Scheme 306

Tightening torque 11 36 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Remove special tool 11 3 240.

Scheme 307

Remove special tool 11 2 300.

Scheme 308

Install dust guard from inspection bore.

Unfasten and remove special tool 11 4 220.

Scheme 309

Install cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56) .

Scheme 310

Assemble engine.

11 31 090 Removing and installing/replacing chain tensioning piston (M52 / M52TU / M54 / M56)

Unfasten cylinder for chain tensioning piston.

Scheme 311

Installation

Replace sealing ring.

Tightening torque 11 31 8AZ. Refer to ENGINE - TIGHTENING TORQUES .

Scheme 312

11 31 505 Adjusting camshaft timing (M52TU / M54 / M56)

Special tools required

1. 00 9 250
2. 11 2 300
3. 11 3 240
4. 11 3 244
5. 11 3 292
6. 11 4 220
7. 11 5 180
8. 11 6 150

Before carrying out adjustment work: check camshaft timing. Refer to 11 31 005 CHECKING CAMSHAFT TIMING (M52TU / M54 / M56) .

Crank engine in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.

Scheme 313

Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.

Scheme 314

X3 only

Secure crankshaft with special tool 11 5 180 in TDC position of 1st cylinder.

Remove special tools 11 2 300 / 11 5 180 before starting engine.

Unscrew studs.

Scheme 315

Remove double VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Press down top of chain tensioner and lock off with special tool 11 3 292.

Scheme 316

Remove cylinder for chain tensioning piston.

Scheme 317

Install special tool 11 4 220.

Scheme 318

Fit adjusting screw to bow cover.

Release screws (1) by half a turn.

Scheme 319

Release nuts (2) by two turns.

Scheme 320

Release nuts (3) by one turn.

Pull out toothed shaft (4) until approx. 1 mm of splines can be seen.

Scheme 321

Withdraw toothed shaft (5) up to stop.

Scheme 322

Fit special tool 11 3 240 to camshafts on cylinder 6. Align camshafts so that special tool 11 3 240 rests without gaps on cylinder head.

Scheme 323

Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.

Scheme 324

Press down chain tensioner at top and remove special tool 11 3 292.

Scheme 325

Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 N.m.

Scheme 326

Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.

Scheme 327

Remove gasket.

Scheme 328

Check dowel sleeves (1) for damage and correct installation position.

Keep sealing face clean and free of oil.

Attach special tool 11 6 150 "without gasket", tighten nuts by hand and then tighten down uniformly until special tool 11 6 150 is in full contact with cylinder head.

Scheme 329

Insert screws (1) on exhaust side and initially tighten to approx. 5 N.m.

Scheme 330

Initially tighten nuts (2) on exhaust side and nuts (3) on inlet side to approx. 5 N.m.

Scheme 331

Tighten down screws (1) on exhaust side.

Scheme 332

Tightening torque 11 31 3AZ. Refer to ENGINE - TIGHTENING TORQUES .

Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.

Scheme 333

Tightening torque 11 31 11AZ. Refer to ENGINE - TIGHTENING TORQUES .

Pull special tool 11 2 300/11 5 180 back until flywheel is no longer secured.

Scheme 334

Remove special tool 11 3 244 and special tool 11 3 240.

Scheme 335

Crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.

Scheme 336

Secure crankshaft in firing TDC position with special tool 11 2 300.

Scheme 337

X3 only

Secure crankshaft with special tool 11 5 180 in TDC position of 1st cylinder.

Remove special tools 11 2 300 / 11 5 180 before starting engine.

Fit special tool 11 3 240 to camshafts.

Scheme 338

Note. The timing is correctly set if the special tool 11 3 240 rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side. The timing must be reset if the special tool 11 3 240 protrudes to the exhaust side.

Scheme 339

Unfasten and remove special tool 11 4 220.

Scheme 340

Install cylinder for chain tensioning piston. Refer to 11 31 090 Removing and installing/replacing chain tensioning piston (M52 / M52TU / M54 / M56) .

Scheme 341

Remove special tool 11 2 300 / 11 5 180.

Scheme 342

Remove special tool 11 6 150.

Install VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56) .

Assemble engine.

11 34 552 Removing and installing or replacing all valves (M52 / S52 / M52TU / M54 / M56)

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head. Refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52 / S52 / M52TU / M54 / M56) .

Replace valve stem seals. Refer to 11 34 560 REPLACING ALL VALVE STEM SEALS (M52 / S52 / M52TU / M54 / M56) .

Remove valves from cylinder head.

If necessary, check valve guide for wear. Refer to 11 12 595 CHECKING A VALVE GUIDE FOR WEAR (M52 / S52 / M52TU / M54 / M56) .

If necessary, ream valve guide. Refer to 11 12 600 REAMING A VALVE GUIDE (M52 / S52 / M52TU / M54 / M56) .

If necessary, remachine valve seat. Refer to 11 12 527 REMACHINING A VALVE SEAT (M52 / S52 / M52TU / M54 / M56) .

Arrangement

Scheme 343

11 34 560 Replacing all valve stem seals (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 11 1 200
2. 11 1 480
3. 11 1 960

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head. Refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52 / S52 / M52TU / M54 / M56) .

Remove all valve springs. Refer to 11 34 715 REPLACING ALL VALVE SPRINGS (M52 / S52 / M52TU / M54 / M56) .

Remove valve stem seal with special tool 11 1 480.

Scheme 344

Lubricate valve stem with oil and insert valve. Fit special tool 11 1 960.

Scheme 345

Coat new valve stem seal (1) with oil and install.

Press valve stem seal firmly home by hand with special tool 11 1 200.

Scheme 346

11 34 715 Replacing all valve springs (M52 / S52 / M52TU / M54 / M56)

Special tools required

1. 11 0 342
2. 11 0 345
3. 11 1 045
4. 11 1 065
5. 11 1 441
6. 11 3 030
7. 11 3 250

(cylinder head removed)

Preliminary tasks are described in Disassembling and assembling cylinder head. Refer to 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52 / S52 / M52TU / M54 / M56) .

Brace bucket tappets with special tool 11 3 250.

Scheme 347

Lift out bearing strip with bucket tappet.

Installation

Only re-use used bucket tappets in the same tappet bore.

Arrange bucket tappets by cylinder and place on special tool 11 3 030 in correct order.

Scheme 348

Insert special tool 11 1 441 from below in special tool 11 1 065 and secure with special tool 11 1 045.

Scheme 349

Align special tool 11 0 345 in direction of valve shaft and select appropriate groove in special tool 11 0 342.

Scheme 350

Press down valve spring on spring cap, top, and remove valve keys.

Scheme 351

Remove valve spring and plate spring.

Arrangement

Scheme 352

11 36 010 Removing and installing or replacing double VANOS adjustment unit (M52TU / M54 / M56)

Special tools required

1. 00 9 250
2. 11 2 300
3. 11 3 240
4. 11 3 450
5. 11 4 220
6. 11 6 170

Necessary preliminary tasks

1. Remove intake filter housing with air -mass flow sensor
2. Remove fan impeller with fan clutch and fan cowl
3. E60: Remove fan cowl with electric fan
4. Remove cylinder head cover, refer to «11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-12-000-removing-and-installing)
5. Remove spark plugs, refer to «12 12 011 REPLACING ALL SPARK PLUGS»(/bmw/x3/e83-2003-2006/remont/gauges-instrument-panels/#engine-electrical-system-repair-m54__12-12-011-replacing-all-spark)

E85 only

1. Remove radiator cover
2. Drain coolant from radiator, refer to «17 00 005 DRAINING OFF AND TOPPING UP COOLANT (M54)»(/bmw/x3/e83-2003-2006/remont/cooling-system-mechanical/#cooling-system-repair-instructions-m54__17-00-005-draining-off-and)

Note. Protect drive belt against emerging coolant. Remove right coolant hose Remove solenoid valve for exhaust side, refer to 11 36 575 REPLACING SOLENOID VALVE FOR EXHAUST SIDE ON VANOS ADJUSTMENT UNIT

Removal of double VANOS adjustment unit is described separately from installation. Assembly sequence for removal and installation is different.

Detach plastic cover for inlet camshaft.

Scheme 353

Unscrew oil pressure pipe.

Scheme 354

Mount special tool 11 3 450 with banjo bolt of oil pressure line.

Scheme 355

When the compressed air supply is connected, several drops of oil are sprayed out of the bore.

Scheme 356

Connect compressed air (2 to 8 bar).

Scheme 357

Note. When the engine is switched off, it is possible that the camshafts are not in their initial positions. With the compressed air supply connected, rotate the engine to return the camshafts to their initial positions.

With compressed air supply connected, crank engine at least two revolutions in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.

Scheme 358

Pull dust guard out of the special tool bore.

Scheme 359

Secure crankshaft in firing TDC position with special tool 11 2 300.

Scheme 360

Automatic transmissions only

Illustration does not show automatic transmission.

If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.

Scheme 361

Unscrew studs.

Scheme 362

Secure camshafts with special tool 11 3 240.

Scheme 363

Detach compressed air connection.

Scheme 364

Note. special tool 11 3 450 still remains fitted.

Remove screw plugs, catch escaping oil on inlet and exhaust sides.

Scheme 365

Remove sealing caps with special tool 11 6 170 or with commercially available short flat nose pliers.

Scheme 366

E85

Use commercially available offset flat nose pliers.

Release fitting screws on inlet and exhaust sides.

Scheme 367

Detach plug connections from camshaft sensor and solenoid valves on exhaust and inlet sides.

Scheme 368

Unscrew suspension eye.

Scheme 369

Release nuts and remove double VANOS adjustment unit.

Scheme 370

The toothed shaft on the inlet side may move and slip out of the spline teeth, the inlet camshaft is thus no longer non-positively connected and the valves could rest on the piston.

Installation of double VANOS adjustment unit is described separately from removal. Assembly sequence for removal and installation is different.

Check dowel sleeves (1) for damage and correct installation position.

Scheme 371

Keep sealing faces clean and free of oil. Apply a thin and even coat of sealing compound Drei Bond 1209 (refer to BMW Parts Service) to contact surface edges of separating face between cylinder head and double VANOS adjustment unit.

Replace seal.

Install and secure double VANOS adjustment unit.

Scheme 372

Attach plug connections of camshaft sensor and solenoid valves on exhaust and inlet sides.

Scheme 373

Insert fitting screws for hydraulic piston on toothed shaft on inlet and exhaust sides and tighten down.

Scheme 374

Tightening torque 11 36 4AZ. Refer to ENGINE - TIGHTENING TORQUES .

Replace sealing caps and install with special tool 11 6 170 or with commercially available short flat nose pliers.

E85

Use commercially available offset flat nose pliers.

Scheme 375

Insert screw plugs with new sealing rings and tighten down.

Scheme 376

Tightening torque 11 36 3AZ. Refer to ENGINE - TIGHTENING TORQUES .

Fit suspension lug.

Scheme 377

Note. If the double VANOS adjustment unit has been replaced, you must check and, if necessary, adjust the camshaft timing. If work has been carried out which has "no" effect on the timing and it is assured that the timing adjustment is correct, the timing check described in the following does not have to be conducted.

Remove cylinder for chain tensioning piston.

Scheme 378

Insert special tool 11 4 220 in cylinder head and bring adjustment screw into contact with tensioning rail.

Scheme 379

Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 N.m.

Scheme 380

Pull special tool 11 2 300 back until flywheel is no longer secured in position.

Scheme 381

Remove special tool 11 3 240.

Scheme 382

Scheme 383

Connect compressed air (2 to 8 bar).

Scheme 384

With compressed air supply connected, crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face each other.

Scheme 385

Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.

Scheme 386

Remove special tool 11 2 300 before switching on the engine.

Check camshaft setting

Fit special tool 11 3 240 to camshafts.

Scheme 387

Note. The timing is correctly set if the special tool 11 3 240 rests without a gap on the cylinder head or protrudes up to 1 mm to the inlet side. The timing must be reset if the special tool 11 3 240 protrudes to the exhaust side.

Scheme 388

If necessary, adjust camshaft timing. Refer to 11 31 505 ADJUSTING CAMSHAFT TIMING (M52TU / M54 / M56) .

Detach compressed air connection.

Scheme 389

Remove special tool 11 3 450.

Fit oil pressure line with new seals.

Scheme 390

Tightening torque 11 36 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Unfasten and remove special tool 11 4 220.

Scheme 391

Install cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56) .

Scheme 392

Remove special tool 11 3 240.

Scheme 393

Remove special tool 11 2 300.

Scheme 394

Assemble engine.

11 36 570 Replacing solenoid valve for inlet side on VANOS adjustment unit

Special tools required

1. 32 2 110

Necessary preliminary tasks

1. Read out fault memory of DME control unit
2. Check stored fault messages
3. Switch off ignition

Unlock hose (1) and detach.

Scheme 395

Unlock plug (2) and remove.

Note. Once it has been removed, oil drips from the solenoid valve. Have a cleaning cloth ready. Make sure no oil drips onto the belt drive. Remove any remnants of oil immediately with cleaning cloth. Do not damage oil line when releasing solenoid valve. Release solenoid valve with special tool 32 2 110.

Scheme 396

Installation

Tightening torque 11 36 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Now clear the fault memory.

11 36 575 Replacing solenoid valve for exhaust side on VANOS adjustment unit

Special tools required

1. 11 6 420

Necessary preliminary tasks

1. Read out fault memory of DME control unit
2. Check stored fault messages
3. Switch off ignition

E85 only

1. Remove fluid tank for windshield washer system

Unlock plug (1) and remove.

Scheme 397

Cut through cable tie (2).

Note. Once it has been removed, oil drips from the solenoid valve. Have a cleaning cloth ready. Make sure no oil drips onto the belt drive. Remove any remnants of oil immediately with cleaning cloth. Release solenoid valve with special tool n 6 420.

Scheme 398

Installation

Tightening torque 11 36 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Now clear the fault memory.

11 40 000 Checking engine oil pressure

Special tools required

1. 11 4 050
2. 13 3 061
3. 13 3 063
4. 13 6 051
5. 13 6 054

Note. For engine oil pressure to be checked, oil pressure switch must be removed and special tools must be installed and connected.

To avoid an excess discharge of oil when removing oil pressure switch

Unscrew oil filter cap; the engine oil flows out of the oil filter housing into the oil sump.

Installation

Replace sealing ring.

Tightening torque 11 42 2AZ. Refer to ENGINE - TIGHTENING TORQUES .

Remove oil pressure switch.

Installation

Tightening torque 12 61 1AZ, refer to ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES .

Install special tool 11 4 050 with sealing ring (1) in place of oil pressure switch.

Scheme 399

Checking engine oil pressure with DIS Tester

Attach special tool 13 6 054 with sealing ring (1) and special tool 13 6 051 and connect to DIS Tester.

Scheme 400

Checking engine oil pressure with pressure gauge

Install special tool 13 3 063 and special tool 13 3 061 (pressure gauge).

Start engine and check engine oil pressure.

Specified value. Refer to ENGINE - TECHNICAL DATA .

11 41 000 Removing and installing/replacing oil pump (M52TU / M54 / M56)

Remove oil sump. Refer to 11 13 000 Removing and installing, sealing/replacing oil sump (M54/56) .

Unfasten nut.

Scheme 401

Installation

Tightening torque 11 41 4AZ. Refer to ENGINE - TIGHTENING TORQUES .

Remove sprocket with chain.

Scheme 402

Installation

Align splines of chain wheel and oil pump shaft to each other.

Version 1

Oil pump integrated in oil scraper

Release screws (1), remove oil pump with oil scraper.

Scheme 403

Version 2

Oil pump and oil scraper - two parts

Release screws and remove oil pump intake pipe.

Scheme 404

Release screws and remove oil pump.

Scheme 405

Installation

Check dowel sleeves (1) for damage and correct installation position.

Scheme 406

Installation

Replace O -ring on intake pipe.

Scheme 407

If necessary, remove control piston.

Press sleeve downwards with suitable drift.

Remove circlip.

Scheme 408

Installation

Scheme 409

1. Control plunger
2. Spring
3. Sleeve
4. O-ring (replace)
5. Circlip

11 42 020 Removing and installing complete full-flow oil filter (M52 / S52 / M52TU / M54 / M56)

Remove intake air housing with air-mass flow sensor.

Unfasten oil filter cover to allow oil to flow out of main flow oil filter housing and back into oil pan.

This operation is described in the section BMW engine oil service. Refer to 00 00 250 BMW ENGINE OIL SERVICE INCL. SUPPLEMENTARY SERVICE (M54 / M56) .

Remove alternator. Refer to 12 31 020 REMOVING AND INSTALLING OR REPLACING ALTERNATOR (M54) .

If necessary, empty supply tank for power steering.

If necessary, remove supply tank (lines remain connected).

If necessary, remove vane pump for power steering (lines remain connected).

If necessary, remove alternator drive belt tensioner.

Remove connector for oil pressure switch.

Scheme 410

If necessary, disconnect plug for oil temperature switch.

Disconnect oil pressure line for VANOS adjustment unit from oil filter housing.

Unfasten screws and remove complete full-flow oil filter.

Installation

Check dowel sleeves for damage and correct installation position.

Scheme 411

Installation

Replace seal.

Scheme 412

Top up engine oil.

11 43 000 Removing and installing/replacing oil dipstick (M54/56)

Necessary preliminary tasks

1. Remove air cleaner housing. Refer to «13 71 000 REMOVING AND INSTALLING INTAKE FILTER HOUSING (M54)»(/bmw/x3/e83-2003-2006/remont/fuel-system/#fuel-system-repair-instructions-m54__13-71-000-removing-and-installing) .
2. Remove intake hose.
3. Remove left firewall panel.
4. Drain engine oil. Refer to «00 00 250 BMW ENGINE OIL SERVICE (M54/56)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__00-00-250-bmw-engine-oil) .

Unscrew bolt (1).

Scheme 413

Detach hose (2) from oil dipstick guide tube.

Unclip fuel line (3).

Unclip retaining clip (4).

Remove oil dipstick guide tube in direction of arrow.

Installation

Replace O-ring.

Assemble engine.

Check engine for leaks.

11 51 000 Removing and installing complete water pump (M52 / S52 / M52TU / M54 / M56)

Remove alternator drive belt. Refer to 11 28 010 REPLACING ALTERNATOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56) .

Note. M52 / S52 Water drain plug is located on exhaust side between cylinders 4 and 5 in engine block (illustration). M52TU / M54 / M56 Water drain plug is located on exhaust side on cylinder 2 in engine block.

Scheme 414

Drain and dispose of coolant.

Installation

Replace seal.

Tightening torque 11 11 5AZ. Refer to ENGINE - TIGHTENING TORQUES .

Vent cooling system and check for leaks.

Release belt pulley.

Scheme 415

Release water pump.

Scheme 416

Tighten two screws (M 6) into thread of water pump and water pump out of timing case.

Scheme 417

Installation

Replace O -ring and coat with coolant as anti-friction agent.

Scheme 418

11 53 000 Removing and installing/replacing coolant thermostat (M52TU / M54 / M56)

Remove fan clutch with fan impeller and fan cowl.

Drain and dispose of coolant.

Note. The water drain plug is located on the exhaust side on cylinder 2 in the engine block.

Installation

Replacing sealing ring on water drain plug.

Tightening torque 11 11 5AZ. Refer to ENGINE - TIGHTENING TORQUES .

Vent cooling system and check for leaks.

Pull locks and disconnect water hoses.

Scheme 419

Installation

Refer to 17 00 ... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM .

Loosen nut (1).

Release screws on thermostat housing, remove thermostat housing.

Scheme 420

Installation

Keep sealing faces clean and free of oil.

Scheme 421

Note. Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.

Installation

Replace seal (1).

Scheme 422

11 61 050 Removing and installing intake air manifold (M54)

Instructions for disconnecting and connecting battery. Refer to 12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .

Disconnect negative battery lead.

Remove engine cover.

Unclip plug connections (1) from holders.

Scheme 423

Detach battery positive lead from intake air manifold.

Detach retainer (2) from battery positive lead.

Press lock and detach vent hose from cylinder head cover.

Scheme 424

Pull off retainer (1).

Scheme 425

Disconnect plug connection (2) for intake air temperature sensor.

Detach terminal strip (3) from fuel injectors and place to one side.

Disconnect plug connection (1) on tank venting valve.

Scheme 426

Remove tank venting valve from retainer (2) on manifold.

Note. For a better overview, this work step is shown on an engine that has been removed.

Instructions for removing and installing fuel hoses. Refer to 13 53 540 REPLACING, SEALING FUEL HOSES .

Unclip fuel line (1) from holder (2).

Scheme 427

Unlock fuel line (1).

Loosen guide tube for dipstick.

Press lock and detach return line from guide tube for oil dipstick.

Remove throttle assembly. Refer to 13 54 030 REMOVING AND INSTALLING/SEALING THROTTLE ASSEMBLY (M54) .

Disconnect plug connections and lay cable duct to one side.

Unclip plug connection (1) for knock sensors from holder. Release nut (2) on manifold support.

Scheme 428

Release nuts on manifold.

Scheme 429

Note. Engines with air injection

Detach vacuum line on reverse side of intake air manifold.

Remove intake air manifold.

Installation

Check gaskets on all cylinders and replace if necessary.

Scheme 430

Installation

Check rubber dampers and if necessary replace together with manifold support.

Scheme 431

11 62 140 Removing and installing/replacing both exhaust manifolds with catalytic converter (M54 X3)

Necessary preliminary tasks

1. Remove microfilter compartment. Refer to «51 71 080 REMOVING AND INSTALLING/REPLACING HEATER BULKHEAD»(/bmw/x3/e83-2003-2006/remont/door-locks-anti-theft-systems/#body-equipment-repair-instructions__51-71-080-removing-and-installingreplacing) .
2. Secure engine in installation position. Refer to «SECURING ENGINE WITH SPECIAL TOOL IN INSTALLATION POSITION (M54)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__securing-engine-with-special-tool-in) .
3. Remove exhaust system. Refer to «18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)»(/bmw/x3/e83-2003-2006/remont/exhaust/#exhaust-system-repair__18-00-020-removing-and-installing) .
4. Remove oxygen sensors. Refer to «11 78 511 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 1-3)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-511-replacing-oxygen-control) , «11 78 512 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 4-6)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-512-replacing-oxygen-control) , «11 78 611 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 1-3)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-611-replacing-oxygen-monitor) and «11 78 612 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 4-6)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__11-78-612-replacing-oxygen-monitor) .
5. Lower front axle. Refer to «FRONT AXLE CARRIER»(/bmw/x3/e83-2003-2006/remont/suspension-front/#front-suspension__front-axle-carrier) .

Note. It is not necessary to perform a wheel alignment on the front axle when the front axle is lowered.

Cylinders 1 -3

Release nut along line (4).

Scheme 432

Feed out exhaust manifold (5) downwards.

Tightening torque: 11 6 21AZ. Refer to ENGINE - TIGHTENING TORQUES .

Cylinders 4 -6

Remove oxygen sensor (2).

Release nut along line (6).

Feed out exhaust manifold (1) downwards.

Tightening torque: 11 62 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Check exhaust system for leaks.

Check function of DME.

Necessary preliminary tasks

1. Secure engine in installation position, refer to «SECURING ENGINE WITH SPECIAL TOOL IN INSTALLATION POSITION (M54)»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-repair-m54__securing-engine-with-special-tool-in) .
2. Remove reinforcement plate
3. Remove complete exhaust system, refer to «18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)»(/bmw/x3/e83-2003-2006/remont/exhaust/#exhaust-system-repair__18-00-020-removing-and-installing) .
4. Detach grounding cable from body.
5. Remove right engine support arm with engine mount, refer to «22 11 100 REPLACING RIGHT ENGINE SUPPORT ARM»(/bmw/x3/e83-2003-2006/remont/mechanical/#engine-and-gearbox-suspension-repair-m54__22-11-100-replacing-right-engine)
6. Remove air pump

Note. The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove front control sensor. Refer to 11 78 511 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 1-3) .

Remove cover from fuel injectors.

Note. Do not mix up monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.

Mark plug connections.

Scheme 433

Unclip cable from holder. Disconnect plug connection. Unclip cable on rear side of engine from cable guide.

Remove monitor sensor from cylinders 1 to 3. Refer to 11 78 611 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 1-3) .

Unscrew nuts.

Scheme 434

Remove exhaust manifold (1).

Installation

Clean sealing faces, replace gaskets.

Replace nuts.

Tightening torque 11 62 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

1. Remove reinforcement plate
2. Remove complete exhaust system, refer to «18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)»(/bmw/x3/e83-2003-2006/remont/exhaust/#exhaust-system-repair__18-00-020-removing-and-installing)
3. Remove air pump

Note. The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.

Remove rear control sensor. Refer to 11 78 512 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 4-6) .

Remove cover from fuel injectors.

Note. Do not mix up monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness.

Mark plug connections.

Unclip cable from holder. Disconnect plug connection. Unclip cable on rear side of engine from cable guide.

Scheme 435

Remove monitor sensor from cylinders 4 to 6. Refer to 11 78 612 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 4-6) .

Unscrew nuts.

Scheme 436

Remove exhaust manifold (1).

Installation

Clean sealing faces, replace gaskets.

Replace nuts.

Tightening torque 11 62 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

11 78 510 Replacing oxygen control sensor (M52TU / M54 / M56)

Special tools required

1. 11 7 020

(for work step number 13 00 002), read out fault memory, clear if necessary.

Note. The plug connection must be disconnected before the oxygen control sensor is removed. If the plug connection separation point is below the cover for the fuel injectors: If necessary, remove lower section of microfilter housing. Remove cover from fuel injectors.

Unclip oxygen control sensor cable from retainer.

Disconnect plug connection for oxygen control sensor. Release oxygen control sensor with special tool 11 7 020.

Scheme 437

Installation

The threads of new oxygen sensors are already coated with Never Seez Compound.

If an oxygen sensor is used again, apply a thin and even coat of Never Seez Compound (refer to BMW Parts Service) to the thread only.

Part of oxygen control sensor which projects into exhaust system branch must not be cleaned or come into contact with lubricant.

Installation

Secure oxygen control sensor with special tool 11 7 020.

Scheme 438

Tightening torque 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Pay attention to cable routing of oxygen control sensor.

11 78 511 Replacing oxygen control sensor (cylinders 1-3)

Special tools required

1. 11 7 020

Necessary preliminary tasks

1. Read out DME fault memory.

Disconnect plug connection for control sensor.

Scheme 439

Release control sensor with special tool 11 7 020.

Tightening torque: 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

Threads of new control sensors are already coated with Never Seez compound.

If the control sensor is reused, coat only the thread with a thin layer of Never Seez compound (refer to BMW Parts Service).

The control sensor section projecting into the exhaust system branch must not be cleaned or come into contact with lubricant.

Check function of DME.

11 78 512 Replacing oxygen control sensor (cylinders 4-6)

Special tools required

1. 11 7 020

Necessary preliminary tasks

1. Read out DME fault memory.

Disconnect plug connection for control sensor. Release control sensor with special tool 11 7 020.

Scheme 440

Tightening torque: 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

Threads of new control sensors are already coated with Never Seez compound.

If the control sensor is reused, coat only the thread with a thin layer of Never Seez compound (refer to Parts Service).

The control sensor section projecting into the exhaust system branch must not be cleaned or come into contact with lubricant.

Check function of DME.

11 78 611 Replacing oxygen monitor sensor (cylinders 1-3)

Special tools required

1. 11 7 030
2. 11 9 150

Necessary preliminary tasks

1. Read out DME fault memory.
2. Remove protection under transmission.
3. Remove cover from injector valves.

Unclip cable and plug.

Scheme 441

Disconnect plug connection.

Note. For purposes of clarity, this work step is shown on the removed exhaust manifold.

Release monitor sensor with special tool 11 7 030 in conjunction with special tool 11 9 150.

Scheme 442

Tightening torque 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

When special tool 11 9 150 is used in conjunction with special tool 11 7 030, 53 N.m on the dial on the torque wrench corresponds to an actual tightening torque of 50 N.m.

Installation

Threads of new monitor sensors are already coated with Never Seez compound.

If a monitor sensor is reused, apply a thin and even coating of Never Seez compound (refer to BMW Parts Service) to the thread only.

The monitor sensor section projecting into the exhaust system branch must not be cleaned or come into contact with lubricant.

Cover monitor sensor when applying underseal. Check function of DME.

11 78 612 Replacing oxygen monitor sensor (cylinders 4-6)

Special tools required

1. 11 7 030
2. 11 9 150

Necessary preliminary tasks

1. Read out DME fault memory.
2. Remove protection under transmission.
3. Remove cover from injector valves.

Unclip cable and plug.

Scheme 443

Disconnect plug connection.

Note. For purposes of clarity, this work step is shown on the removed exhaust manifold.

Release monitor sensor with special tool 11 7 030 in conjunction with special tool 11 9 150.

Scheme 444

Tightening torque: 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Installation

When special tool 11 9 150 is used in conjunction with special tool 11 7 030, 53 N.m on the torque wrench dial corresponds to an actual Tightening torque of 50 N.m.

Installation

Threads of new monitor sensors are already coated with Never Seez compound.

If a monitor sensor is reused, apply a thin and even coating of Never Seez compound (refer to Parts Service) to the thread only.

The monitor sensor section projecting into the exhaust system branch must not be cleaned or come into contact with lubricant.

Cover monitor sensor when applying underseal.

Pay attention to cable routing of monitor sensor.

Check DME fault memory.

11 78 613 Replacing both oxygen monitor sensors (M52TU / M54 / M56)

Special tools required

1. 11 7 020
2. 11 7 030

(for work step number 13 00 002), read out fault memory, clear if necessary.

Illustrations show M54.

Remove cover from fuel injectors.

Scheme 445

Note. Do not mix up oxygen monitor sensors for cylinders 1 to 3 and 4 to 6 at plug connection to wiring harness. Mark plug connections.

Unclip the cable from the retainer. Disconnect plug. Unclip cable on rear side of engine from cable guide.

Note. On vehicles with automatic transmission: In event of unfavorable tolerances, accessibility to the oxygen monitor sensor from cylinders 4 to 6 is only possible after the exhaust system has been removed.

Scheme 446

Release oxygen monitor sensor from cylinders 1 to 3 with special tool 11 7 030.

Release oxygen monitor sensor from cylinders 4 to 6 with special tool 11 7 020.

Installation

The threads of new oxygen monitor sensors are already coated with Never Seez compound.

If an oxygen monitor sensor is reused, only apply a thin and uniform coat of Never Seez compound (refer to BMW Parts Service) to thread.

Part of oxygen control sensor which projects into exhaust system branch must not be cleaned or come into contact with lubricant.

Installation

Secure oxygen monitor sensor for cylinders 1 to 3 with special tool 11 7 030.

Scheme 447

Secure oxygen monitor sensor for cylinders 4 to 6 with special tool 11 7 020.

Tightening torque 11 78 1AZ. Refer to ENGINE - TIGHTENING TORQUES .

Cover oxygen monitor sensors when applying underseal.

Pay attention to cable routing of oxygen monitor sensors.

Scheme 448

See also:
• ENGINE - TIGHTENING TORQUES
• ENGINE - TECHNICAL DATA
• 12 00... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY
• 51 00 ... SERVICE POSITION OF ENGINE HOOD
• 13 71 000 REMOVING AND INSTALLING INTAKE FILTER HOUSING (M54)
• 51 71 080 REMOVING AND INSTALLING/REPLACING HEATER BULKHEAD
• 17 00 005 DRAINING OFF AND TOPPING UP COOLANT (M54)
• 17 11 000 REMOVING AND INSTALLING RADIATOR (M54)
• 51 47 ... REMOVING AND INSTALLING/REPLACING LEFT OR RIGHT UNDERBODY PANELING
• 51 47 490 REMOVING AND INSTALLING/REPLACING FRONT UNDERBODY PROTECTION
• 18 00 020 REMOVING AND INSTALLING COMPLETE EXHAUST SYSTEM (M54)
• REMOVAL & INSTALLATION - X3 (GS6-37BZ)
• REMOVAL & INSTALLATION (A5S 360R/390R)
• 51 13 115 REMOVING AND INSTALLING/REPLACING COWL PANEL COVER
• 12 13 511 REPLACING IGNITION COILS (M54)
• 12 12 011 REPLACING ALL SPARK PLUGS
• 17 00 039 VENTING COOLING SYSTEM AND CHECKING FOR LEAKS (M54/M56)
• LOWER SECTION OF STEERING SPINDLE
• FRONT AXLE CARRIER
• TORQUE SPECIFICATIONS
• TORQUE SPECIFICATIONS
• CLUTCH
• ENGINE ELECTRICAL SYSTEM - TIGHTENING TORQUES
• 12 31 020 REMOVING AND INSTALLING OR REPLACING ALTERNATOR (M54)
• 17 00 ... INSTRUCTIONS FOR WORKING ON COOLING SYSTEM
• 13 53 540 REPLACING, SEALING FUEL HOSES
• 13 54 030 REMOVING AND INSTALLING/SEALING THROTTLE ASSEMBLY (M54)
• 22 11 100 REPLACING RIGHT ENGINE SUPPORT ARM
• 11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)
• 11 28 010 REPLACING ALTERNATOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)
• 11 78 611 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 1-3)
• 11 78 612 REPLACING OXYGEN MONITOR SENSOR (CYLINDERS 4-6)
• 11 62 140 REMOVING AND INSTALLING BOTH EXHAUST MANIFOLDS WITH CATALYTIC CONVERTERS (M52TU / M54 / M56)
• 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54)
• 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56)
• 11 53 000 REMOVING AND INSTALLING/REPLACING COOLANT THERMOSTAT (M52TU / M54 / M56)
• 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56)
• 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56)
• 11 34 715 REPLACING ALL VALVE SPRINGS (M52 / S52 / M52TU / M54 / M56)
• 11 34 560 REPLACING ALL VALVE STEM SEALS (M52 / S52 / M52TU / M54 / M56)
• 11 34 552 REMOVING AND INSTALLING OR REPLACING ALL VALVES (M52 / S52 / M52TU / M54 / M56)
• 11 12 600 REAMING A VALVE GUIDE (M52 / S52 / M52TU / M54 / M56)
• 11 12 527 REMACHINING A VALVE SEAT (M52 / S52 / M52TU / M54 / M56)
• 00 00 250 BMW ENGINE OIL SERVICE INCL. SUPPLEMENTARY SERVICE (M54 / M56)
• 11 43 000 REMOVING AND INSTALLING/REPLACING OIL DIPSTICK (M54/56)
• SECURING ENGINE WITH SPECIAL TOOL IN INSTALLATION POSITION (M54)
• 11 23 010 REMOVING AND INSTALLING OR REPLACING VIBRATION DAMPER (M52TU / M54 / M56)
• 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (M52TU / M54 / M56)
• 11 14 141 REPLACING RADIAL SEAL IN LOWER TIMING CASE COVER
• 11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (M52 / S52 / M52TU / M54 / M56)
• 11 14 151 REPLACING CRANKSHAFT RADIAL SEAL (TRANSMISSION SIDE)
• 11 21 531 REPLACING ALL MAIN CRANKSHAFT BEARING SHELLS (M52 / S52 / M52TU / M54 / M56)
• 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (M52 / S52 / M52TU / M54 / M56)
• 11 21 571 REPLACING GROOVED BALL BEARING IN CRANKSHAFT (M52 / S52 / M52TU / M54 / S50 / S54)
• 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56)
• 11 31 505 ADJUSTING CAMSHAFT TIMING (M52TU / M54 / M56)
• 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56)
• 11 31 005 CHECKING CAMSHAFT TIMING (M52TU / M54 / M56)
• 11 12 503 DISASSEMBLING AND ASSEMBLING CYLINDER HEAD (M52 / S52 / M52TU / M54 / M56)
• 11 12 595 CHECKING A VALVE GUIDE FOR WEAR (M52 / S52 / M52TU / M54 / M56)
• 11 36 575 REPLACING SOLENOID VALVE FOR EXHAUST SIDE ON VANOS ADJUSTMENT UNIT
• 11 78 511 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 1-3)
• 11 78 512 REPLACING OXYGEN CONTROL SENSOR (CYLINDERS 4-6)