00 00 250 BMW engine oil service incl. supplementary service (M54 / M56)
Note. Engine Oil Service including Supplementary Service 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 65
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 11 42 OIL FILTER AND PIPES .
Installation
Replace and oil O-ring.
Scheme 66
Drain or draw off engine oil.
When engine oil is drained, open cap in engine underguard.
Open oil drain plug and drain off engine oil.
Scheme 67
Installation
Replace sealing ring.
Tightening torque 11 13 1AZ. Refer to 11 13 OIL PAN .
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)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 0 224
- 11 0 226
Important!
High tension - mortal danger!
Cut off power supply to ignition coils (disconnect plug connection at DME control unit).
Necessary Preliminary Tasks
- Connect charger or a second battery.
- Read out fault memory of DME control unit
- Pull fuel pump relay or fuel pump fuse.
- Start engine and allow residual fuel to drain out (pressure reduction).
- Remove all spark plugs. Refer to «12 12 011 REPLACING ALL SPARK PLUGS»(ref-202355-S41420243292005102700000) .
Important!
Check Schrader valve on special tool 11 0 226 for tight fit.
Screw special tool 11 0 226 by hand into spark plug thread and connect special tool 11 0 224.
Note. Check that sealing ring is in perfect condition.
Scheme 68
Depress accelerator and actuate starter until compression stops rising.
Compression pressure.
Scheme 69
Assemble engine.
Now clear the fault memory.
11 00 045 Checking absolute compression of all cylinders
With BMW Diagnosis Information System (DIS).
Scheme 70
- Connect DIS tester.
- BMW measuring technology.
- Preset measurements.
- Absolute compression. The further procedure is described in: Help. Help on preset measurements.
- Adaptation of "Absolute compression".
- Clear fault memory.
11 00 050 Removing and installing engine (M52 / S52 / M52TU / M54)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 0 000
Instructions for disconnecting and connecting battery. Refer to 12 00 ... INSTRUCTIONS FOR DISCONNECTING AND CONNECTING BATTERY .
Disconnect negative battery lead.
E36
Move engine hood into assembly position and remove heater bulkhead (air collector). These work steps are described in Removing complete wiper bracket.
Z3
Move engine hood to assembly position
Note. The following work must be carried out with a second person assisting. Work instruction applies to left and right sides.
Hold engine bonnet/hood.
Unclip retainer (1).
Unhook damper and suspend in ball head (2).
Scheme 71
Unscrew and remove splash guard.
Remove transmission, refer to REMOVAL & INSTALLATION or REMOVAL & INSTALLATION .
Note. M52TU / M54: The water drain plug is located on the exhaust side on cylinder 2 in the engine block.
Scheme 72
Drain off coolant and dispose of correctly.
Installation
Replace seal.
Tightening torque, refer to 11 11 5AZ in 11 11 ENGINE BLOCK .
Remove radiator.
Take off cover.
Scheme 73
Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .
Unfasten engine section of wiring harness and place to one side with cable duct.
Remove fan clutch with fan impeller. Refer to 11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56) .
Disconnect coolant hoses at heating valve and heater.
Scheme 74
Unfasten reservoir for power steering unit and tie up to one side.
Note. Lines remain connected.
Remove vane pump from power steering unit.
Note. Lines remain connected.
Scheme 75
Fit engine to special tool 11 00 000.
Scheme 76
Front and rear suspension arrangement
Scheme 77
Unfasten right ground wire.
Scheme 78
Unscrew left and right engine mounts.
Lift out engine.
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 COIL (M52, M52TU .
Remove wiring harness of ignition coils from cylinder head cover and place to one side.
Note. Illustration on M54 engine.
Press lock.
Pull off the hose for the engine breather.
Scheme 79
Remove grounding straps (1).
Remove cylinder head cover. Refer to 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56) .
Scheme 80
Installation
Remove sealing debris from sealing faces of cylinder head and cylinder head cover.
Apply a sealing bead of Drei Bond 1209 on left and right sides at transition between cylinder head and VANOS adjustment unit.
Scheme 81
Installation
Apply a thin and even sealing bead of Drei Bond 1209 at transition to half-moon sections at VANOS adjustment unit.
Scheme 82
Note. Illustration with engine removed.
Installation
Apply a thin and even sealing bead of Drei Bond 1209 at transition to half-moon sections at rear of cylinder head.
Scheme 83
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 84
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)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 0 200
- 00 9 120
Remove both exhaust manifolds. Refer to 11 62 140 REMOVING AND INSTALLING BOTH EXHAUST MANIFOLDS WITH CATALYTIC CONVERTER (M52TU / M54) .
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.
Remove cylinder head cover. Refer to 11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56) .
Remove all spark plugs. Refer to 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, refer to 11 11 5AZ in 1` 11 11 ENGINE BLOCK .
Vent cooling system and check for leaks.
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 85
Installation
Replace O-ring on coolant pipe.
If necessary, replace sealing rings on banjo bolt (1).
Tightening torque of banjo bolt (1) 11 36 2AZ. Refer to 11 36 VARIABLE CAMSHAFT CONTROL .
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 86
Release screws, remove chain guide.
Scheme 87
Release cylinder head bolts from outside to inside in sequence 14 to 1.
Scheme 88
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.
Apply permanently elastic sealing compound Drei Bond 1209 to joints to timing case cover.
Replace cylinder head gasket.
Scheme 89
Note. A cylinder head seal 0.3 mm thicker than usual can be obtained for machined (milled) cylinder heads.
Scheme 90
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.
Scheme 91
Tightening torque 11 12 6AZ. Refer to 11 12 CYLINDER HEAD WITH COVER .
Note. Use special tool 00 9 120 for torsion angle tightening.
Install chain guide.
Scheme 92
Insert screws and tighten down screw connection between timing case cover and cylinder head.
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.
Scheme 93
11 12 101 Replacing cylinder head gasket (M52 / S52 / M52TU / M54 / M56)
Tasks are identical to removing and installing cylinder head. Refer to 11 12 100 REMOVING AND INSTALLING/REPLACING CYLINDER HEAD (M52TU / M54 / M56) .
11 12 527 Remachining a valve seat (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 3 520
- 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 94
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).
- Valve-seat angle.
- Correction angle, outside.
- Correction angle, inside.
- Outside diameter seat face.
- Valve-seat width.
Specified values (1 to 5). Refer to 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B 30 or 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B22 or 11 12 CYLINDER HEAD WITH VALVE SEAT COVER M54 B25
Scheme 95
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.
Note. Max, permissible tilt clearance. Refer to 11 12 CYLINDER HEAD WITH COVER M54 .
Scheme 96
Note. If tilt clearance is excessive, valve guide is reamed out and a repair valve with a larger shaft diameter is installed.
If necessary, ream valve guide. Refer to 11 12 600 REAMING A VALVE GUIDE (M52 / S52 / M52TU / M54 / M56) .
Scheme 97
11 12 600 Reaming a valve guide (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 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 98
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.
Deviation from flatness max. 0.05 mm.
Scheme 99
Note. Machining limit. Refer to 11 12 CYLINDER HEAD WITH COVER M54 .
Scheme 100
Note. For compression comparison check, a repair cylinder head seal is provided.
Scheme 101
11 12 729 Checking cylinder head for watertightness (M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 7 390
- 11 7 391
- 11 7 392
- 11 7 393
- 11 7 394
- 11 7 395
- 11 7 396
- 11 7 397
- 11 7 398
(Cylinder head dismantled)
Prepare special tool kit 11 7 390.
Note. Special tool kit 11 7 390 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 102
Turn back screw (1).
Note. Special tool 11 7 394 is secured with a pin (2).
Fit special tool 11 7 394.
Scheme 103
Insert screw (1) by hand until special tool 11 7 393 rests on sealing surface.
Tighten down screw (1) by approx. a half to one turn.
Scheme 104
Check sealing rings (1) and coat with water as anti-friction coating. Insert special tool 11 7 395 and tighten down.
Scheme 105
Seal coolant apertures with special tool kit 11 7 390.
Scheme 106
Connect compressed air to special tool 11 7 395.
Scheme 107
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 oil sump (M52 / S52 / M52TU / M54)
Note. To remove the oil sump, you must lower the front axle support. There is no need to perform a front axle alignment check.
Remove intake filter housing with air-mass flow sensor.
Remove engine splash guard.
Drain engine oil. Refer to 00 00 250 BMW ENGINE OIL SERVICE INCL. SUPPLEMENTARY SERVICE (M54 / M56) .
Loosen guide tube for dipstick.
Scheme 108
Remove oil return hose from cyclone oil separator on guide tube for oil dipstick.
Pull out guide tube for oil dipstick.
Scheme 109
Installation
Replace O-ring.
Scheme 110
Prepare special tool 00 0 200, consisting of special tool 00 0 201/202/204/206.
Scheme 111
Unclip oil lines for power steering unit from bracket on engine support and place to one side.
Fit special tool 00 0 206 to engine mounting.
Scheme 112
Carefully lift engine approx. 5 mm.
Scheme 113
Unfasten steering spindle from steering gear. Refer to POWER STEERING GEAR .
Remove vane pump for power steering unit (lines remain connected).
Drain power steering supply tank and tie back to one side (lines remain connected).
Scheme 114
Loosen top and unfasten bottom of left and right engine mounts.
Scheme 115
Unfasten left and right control arm from engine carrier. Unfasten screw connection on front axle support and lower the front axle support. Refer to BALL JOINT .
Note. There is no need to detach the steering gear from the front axle support.
Automatic transmission
Remove oil pipes from oil pan.
Unfasten oil pan screws at transmission and engine ends.
Lower oil pan and pull forwards to remove.
Scheme 116
Installation
Sealing faces clean and free of seal debris.
Apply Drei Bond 1209 sealing compound to area around joint approx. 3 mm wide and 2 mm high.
Scheme 117
Installation
- Replace gasket.
- Install oil sump. Refer to «11 13 000 REMOVING AND INSTALLING OIL SUMP (M52 / S52 / M52TU / M54)»(ref-202354-S14678787552005102700000) or «11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (M52TU / M54 / M56)»(ref-202354-S01433536922005102700000) .
- Insert all oil sump screws.
- Insert screws in transmission end without preload at this stage.
- Tighten down screws in engine end.
- Tighten down screws in transmission end.
11 13 000 Removing and installing, sealing or replacing oil sump (M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 0 200
- 00 0 201
- 00 0 202
- 00 0 204
- 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 0 204 / 00 0 208 and fit.
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.
Scheme 118
Tighten the screws (1 and 2).
Scheme 119
Raise engine with special tool 00 0 200 approx. 5 mm.
Scheme 120
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.
Note. M52 TU and M54 only.
Detach return hose from cyclone oil separator on oil dipstick guide tube.
Remove oil dipstick guide tube upwards.
Scheme 121
Installation
Replace O-ring.
Scheme 122
Remove front end reinforcement.
Detach steering spindle from steering gear. Refer to POWER 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 123
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 124
Installation
Sealing faces clean and free of seal debris.
Apply approx. 3 mm wide, 2 mm high coat of Drei Bond 1209 sealing agent to the area around seams.
Scheme 125
Installation
- Replace gasket
- Install oil sump.
- Insert all oil sump screws.
- Insert screws in transmission end without preload at this stage.
- Tighten down screws in engine end.
- Tighten down screws in transmission end.
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 126
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. 11 13 000 REMOVING AND INSTALLING OIL SUMP (M52 / S52 / M52TU / M54) or 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 127
Unscrew timing case cover to cylinder head bolts.
Scheme 128
Unfasten screws and remove timing case cover.
Scheme 129
Important!
Check cylinder head gasket for damage; if necessary, remove cylinder head and replace cylinder head gasket.
Installation
Clean sealing surfaces.
Drive alignment pins into timing case cover until they protrude approx. 2 to 3 mm.
Scheme 130
Installation
Secure new seals to timing case cover with a little grease.
Scheme 131
Installation
Sealing faces clean and free of seal debris.
Apply Drei Bond 1209 sealing compound at following points
- A bead at the transitions to the cylinder head gasket on the left and right.
- Thinly and evenly to the entire sealing face of the timing case cover to the cylinder head gasket.
Scheme 132
Installation
Install timing case cover, insert all screws and initially tighten to approx. 5 Nm.
Scheme 133
Installation
Drive in dowel pins from front until flush.
Scheme 134
Installation
Fully tighten all screws in alternate sequence.
Tightening torque, refer to 11 14 1AZ in 11 14 CASE COVERS .
Important!
Once all screws have been tightened down, retighten them in a second operation.
Scheme 135
Insert screws, tighten screw connection for timing case cover to cylinder head.
Scheme 136
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
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 2 380
- 11 2 383
- 11 2 385
- 11 3 280
Note. This repair instruction is valid for the following engines
- M50 / M52 / M52TU / M54 / M56
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
Fit special tool 11 2 383 to crankshaft.
Scheme 137
Fit special tool 11 2 385 to crankshaft.
Align groove of special tool 11 2 385 to featherkey of crankshaft.
Note. Special tool 11 2 385 centers special tool 11 2 380.
Scheme 138
Screw in special tool 11 2 380 until it has made firm contact with radial seal.
Remove radial seal by tightening screw on special tool.
Scheme 139
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 140
11 14 151 Replacing crankshaft radial seal (transmission side)
Note. This repair instruction is valid for the following engines
- M50 / M52 / M52TU / M54 / M56
Necessary Preliminary Tasks
- Remove gearbox.
- Drain off engine oil.
- Remove flywheel.
Unfasten oil sump screws on transmission end.
Loosen oil pan.
Scheme 141
Release screws in end cover at rear.
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.
Scheme 142
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 143
Distinguishing feature
- (1) New version "without hose spring".
- (2) Old version "with hose spring".
Scheme 144
Important!
The sealing lip of the new version (1) is very sensitive and must not be kinked under any circumstances. Do not touch the sealing lip with your fingers.
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 145
Check dowel sleeves (1) for damage and correct installation position.
Scheme 146
Replace seal (2).
Apply thin, uniform coat of Drei Bond 1209 sealing compound to edges of joint on oil pan.
Important!
Do not use special tool 11 2 213 for the new radial seal version.
Scheme 147
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.
Lubricate contact face of crankshaft.
Important!
Push on end cover with support bushing (1) straight and without tilting sideways.
Scheme 148
Note. Screw threads (1) are coated with sealing compound.
Replace screws (1).
Inserting screws of tighten down end cover.
Scheme 149
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 150
11 21 500 Replacing crankshaft (M52 / S52 / M52TU / M54 / M56)
(Engine removed)
Necessary Preliminary Tasks
- Removing cylinder head.
- Removing lower timing case cover.
- Removing all pistons. Refer to «11 25 530 REMOVING AND INSTALLING OR REPLACING ALL PISTONS (M52 / S52 / M52TU / M54 / M56)»(ref-202354-S28154440852005102700000) .
- Remove end cover. Refer to «11 14 151 REPLACING CRANKSHAFT RADIAL SEAL (TRANSMISSION SIDE)»(ref-202354-S39275307592005102700000) .
Checking axial clearance
If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary, end float. Refer to CRANKSHAFT WITH BEARING .
Scheme 151
Unfasten screw connection on reinforcement plates.
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 152
Unfasten screw connection on main bearing.
Remove main bearing caps (1 to 7).
Lever out crankshaft.
Scheme 153
If necessary, release incremental gear.
Installation
Replace screws.
Install screws and tighten down in two passes.
Tightening torque, refer to 11 21 1AZ in 11 21 CRANKSHAFT AND BEARINGS .
Important!
Check grinding stage of crankshaft. Refer to CRANKSHAFT WITH BEARING .
Scheme 154
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)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 2 590
- 00 9 120
- 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 155
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 156
Installation
Screw threads are coated with screw securing adhesive (Loctite).
Replace screws.
Important!
Observe grinding stage of crankshaft. Refer to CRANKSHAFT WITH BEARING .
Scheme 157
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 158
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.
Scheme 159
Note. The axial guide on the crankshaft is fitted to bearing point 6. Insert pilot bearing shell in the engine block.
Scheme 160
Install crankshaft.
Note. The crankshaft is marked with yellow, green or white paint according to the tolerance of the main journal.
Scheme 161
Installation
The bearing shell classification for the bearing cover is marked on the crankshaft in yellow, green or white paint.
Insert main bearing shells with same crankshaft color coding in main bearing caps.
Scheme 162
The bearing shells are marked with yellow, green or white paint.
- Bearing shell.
- Guide bearing.
Observe grinding stage of main bearing journals. Refer to CRANKSHAFT WITH BEARING .
Scheme 163
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 164
Check clearance on main crankshaft bearing.
Install crankshaft and place special tool 00 2 590 (Plastigage Type PG1) on oil-free crankshaft.
Do not twist crankshaft.
Scheme 165
Install main bearing cap so that grooves in main bearing shell guide are one side.
Align main bearing cap flush with side of bearing seat.
Scheme 166
Installation
To check main bearing clearance, use the old main bearing screws.
There must be no oil in the blind holes (risk of cracking).
Scheme 167
- Tighten down main bearing screws with jointing torque.
- Tighten down main bearing bolts with special tool 00 9 120 to angle of rotation. Tightening torque, refer to 11 11 1AZ in «ENGINE BLOCK»(ref-202649-S01507648772005102800000) .
Remove main bearing cap and read off bearing clearance at width of pinched plastic thread on measuring scale.
Scheme 168
Radial crankshaft bearing clearance. Refer to CRANKSHAFT WITH BEARING .
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 one side.
Align main bearing cap flush with side of bearing seat.
Scheme 169
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 170
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
- Tighten all screws on main bearing cover with jointing torque.
- Unfasten screws on main bearing cover 6.
- Strike back and front of crankshaft with plastic hammer to center thrust bearing (do not damage crankshaft).
- Tighten screws of main bearing cover 6 with jointing torque.
- 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, refer to 11 11 1AZ in ENGINE BLOCK .
Scheme 171
Check axial play.
If permitted end float is exceeded, check crankshaft, guide bearing shells and engine block, replacing if necessary, end float. Refer to CRANKSHAFT WITH BEARING .
Scheme 172
11 21 571 Replacing grooved ball bearing in crankshaft (M52 / S52 / M52TU / M54 / S50 / S54)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 5 500
- 11 2 340
- 11 2 350
(Clutch removed)
Important!
In version with needle bearing (1) in dual-mass flywheel (2), no grooved ball bearing may be fitted in the crankshaft.
Scheme 173
Version With Grooved Ball Bearing
Remove guide bearing with special tool 11 2 340.
Scheme 174
Install new thrust bearing and drive firmly home with special tool 11 2 350 in conjunction with special tool 00 5 500.
Scheme 175
11 22 500 Removing and installing or replacing flywheel (M52 / S52 / M52TU / M54 / S54)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 2 170
(Clutch removed)
Lock flywheel with special tool 11 2 170.
Scheme 176
Unfasten screws and remove flywheel.
Scheme 177
Installation
Check dowel sleeve for damage and correct installation position.
Scheme 178
Installation
Position of dowel sleeve (1) in dual-mass flywheel is identified by two notches next to associated bolt hole.
Scheme 179
Installation
Clean thread and install new micro-encapsulated screws.
Scheme 180
Tightening torque, refer to 11 22 1AZ in FLYWHEEL .
11 24 571 Replacing all connecting rod bearings (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 2 590
- 00 9 120
- 11 2 110
(Piston removed)
Important!
Note grinding stages on crankshaft. Refer to CRANKSHAFT WITH BEARING .
Install new conrod bearing shells. Refer to 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (M52 / S52 / M52TU / M54 / M56) .
Insert one blue (1) and one red (2) bearing shell (irrespective of the color coding on the conrod shaft).
Scheme 181
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.
Fit bearing caps so that pair numbers match up.
Scheme 182
Important!
Do not distort conrods or crankshaft.
Use the old conrod bolts to check conrod clearance.
Tighten down conrod bolts with special tool 00 9 120 or with special tool 11 2 110.
Tightening torque, refer to 11 24 1AZ in CONNECTING RODS AND BEARING .
Scheme 183
Remove bearing cap and read off bearing play at width of flattened plastic thread with assistance of measurement scale.
Scheme 184
Conrod bearing clearance. Refer to CRANKSHAFT WITH BEARING .
- Remove plastic thread.
- Coat crankshaft and bearing shells with oil.
- Install new conrod bolts and tighten down.
Tightening torque, refer to 11 24 1AZ in CONNECTING RODS AND BEARING .
11 25 530 Removing and installing or replacing all pistons (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 9 120
- 11 2 110
- 11 2 260
- 11 2 470
- 11 3 480
- 11 8 141
(Engine removed)
Remove cylinder head.
Removal
Removal of pistons is described separately from installation.
Assembly sequence for removal and installation is different.
Important!
Re-install piston, connecting rod and bearing shells back in the same position and in the same installation location.
Connecting rods and bearing covers are designated with the same pair number: do not mix them.
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 185
Note. Figure shows crankshaft removed.
On engines with spray nozzles for piston cooling on cylinder underside
Important!
When removing and installing pistons, make sure the piston cooling spray nozzles are not damaged.
Scheme 186
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 187
Unscrew conrod bearing cover.
Scheme 188
Insert special tool 11 3 430 in conrod.
Remove conrod with piston from cylinder head side.
Scheme 189
Lift out retaining ring and press out piston pin.
Scheme 190
Important!
Piston and piston pin are paired and must not be fitted individually.
Installation
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 191
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.
Measurement A, refer to PISTON WITH RINGS AND PINS .
Scheme 192
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 193
Diameter of cylinder bore, refer to ENGINE BLOCK .
Piston installation clearance, refer to PISTON WITH RINGS AND PINS .
Total permissible wear tolerance, refer to PISTON WITH RINGS AND PINS .
Replace conrod bearing shells. Refer to 11 24 571 REPLACING ALL CONNECTING ROD BEARINGS (M52 / S52 / M52TU / M54 / M56) .
Important!
Piston and piston pin are paired and must not be fitted individually.
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 194
Install snap ring so that opening is opposite recess.
Scheme 195
Insert special tool 11 2 470 in conrod.
Scheme 196
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 197
Install piston so that arrow points to camshaft drive.
Scheme 198
Entire circumference of tightening strap must rest firmly on engine block.
Important!
Danger of piston ring failure.
Press in piston only with finger force (do not knock in!).
Attach crankpin to connecting rod.
Scheme 199
Apply light coat of oil to connecting-rod bearing shells.
Fit bearing caps so that pair numbers match up.
Install new conrod bolts.
Scheme 200
Tighten down conrod bolts with special tool 00 9 120 or special tool 11 2 110.
Tightening torque, refer to 11 24 1AZ in CONNECTING RODS AND BEARING .
Scheme 201
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 202
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 203
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.
- Plain compression ring.
- Stepped compression ring "Top".
- Slotted oil ring with hose spring clip.
Scheme 204
Measure axial play. Refer to PISTON WITH RINGS AND PINS .
Scheme 205
Measure end clearance. Refer to PISTON WITH RINGS AND PINS .
Scheme 206
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
- Remove fan clutch with fan impeller. Refer to «11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56)»(ref-202354-S21527927182005102700000) .
- Remove A/C compressor drive belt. Refer to «11 28 050 REPLACING A/C COMPRESSOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56)»(ref-202354-S37336269092005102700000) .
Remove cap from tensioning roller.
Scheme 207
Relieve tension on belt drive.
Scheme 208
Remove drive belt.
Important!
Drive belt must be replaced if fouled with hydraulic fluid.
Installation
Check drive belt for coolant and oil residues, replace if necessary.
Installation
Check that belt is correctly positioned on belt pulleys.
Scheme 209
Version with auxiliary tensioning roller.
Scheme 210
Installation
Locking device of auxiliary tensioning roller must snap into groove on alternator.
Scheme 211
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
- 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 212
Model With Mechanical Drive Belt And Tension Jack
Press back drive belt tensioner at hexagon head or Torx socket and remove drive belt.
Scheme 213
Important!
Drive belt must be replaced if fouled with hydraulic fluid.
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)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 9 250
- 11 2 300
- 11 3 240
- 11 3 244
- 11 3 250
- 11 3 260
- 11 3 292
- 11 4 220
- 11 6 150
- 11 6 180
(If necessary inlet or exhaust side)
The inlet or exhaust camshaft can be replaced in the vehicle.
Important!
Incorrect assembly/removal without special tools exposes the camshaft to the risk of preliminary damage or breakage. The valves may also be bent by contact with the piston crown. Comply without fail with the job instructions, recommended special tools and work sequence.
Removal
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) .
Important!
Cylinder for chain tensioning piston is under spring pressure.
Unfasten cylinder for chain tensioning piston.
Scheme 214
Press down secondary chain tensioner at top and lock with special tool 11 3 292.
Scheme 215
Release nuts, remove sensor gear (1).
Scheme 216
Remove plate spring (2).
Scheme 217
Release nuts on inlet side and remove corrugated washer (7).
Scheme 218
Unfastening screws.
Scheme 219
Lift off exhaust and inlet chain wheels together with chain, friction washer (3) and toothed shaft (4).
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.
Scheme 220
Remove toothed shaft (5) with toothed sleeve (6).
Scheme 221
Unfasten screws. Remove secondary chain tensioner.
Scheme 222
Release screw-in pin.
Scheme 223
Feed chain wheel (1) towards front out of timing chain (2).
Scheme 224
Note. Timing chain remains positioned over exhaust camshaft.
Scheme 225
If necessary, release screw-in pin on inlet side.
Remove thrust washer.
Scheme 226
Remove sensor gears.
Scheme 227
Important!
Do "not" release these screws.
Scheme 228
Unscrew studs.
Scheme 229
Pull special tool 11 2 300 back until flywheel is no longer secured in position.
Scheme 230
Important!
To prevent damaging valves when fitting the camshafts, no pistons should be in TDC position.
Lift timing chain and hold under tension.
Rotate engine against direction of engine rotation approx. 30° using the central bolt.
Scheme 231
Important!
Bearing cap 1 of inlet camshaft is centered with adapter sleeves.
To prevent inlet camshaft from tilting in bearing strip, release nuts and remove bearing cap 1.
Scheme 232
Fit special tool 11 3 260 to cylinder head and screw into spark plug threads in cylinders 1 and 4.
Scheme 233
Turn the eccentric shaft to tension the bearing caps. Unfasten nuts on bearing cover.
Scheme 234
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 235
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.
Note. Only re-use used bucket tappets in the same tappet bore.
Scheme 236
Check bearing points on bucket tappets for signs of wear (scoring).
Scheme 237
Bearing strips are marked "A" for exhaust side and "E" for inlet side.
Scheme 238
Note centering dowels on retaining pins at bearing points 2 and 7.
Scheme 239
Install bearing strips.
Installation
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.
Important!
The bucket tappets expand when not subjected to load by the camshaft and therefore require some time before they can be pushed back down. During a rapid assembly sequence, the "closed" valves may still be open and be in contact with the piston.
Comply with following waiting periods after installing camshaft and before cranking engine back to TDC position.
- Room temperature (20°C) 4 mins.
- 10°C ... 20°C 11 mins.
- 0°C ... 10°C 30 mins.
Pull up timing chain and feed in exhaust camshaft.
Position timing chain on exhaust camshaft.
Scheme 240
Install camshafts so that cam tips on inlet and exhaust valves on 1st cylinder face one another. Refer to 11 31 001 REPLACING CAMSHAFT (M52TU / M54 / M56) .
Scheme 241
Fit bearing cover.
Note. Bearing caps are marked from exhaust side
A1 ... A7 for exhaust side.
E1 ... E7 for inlet side.
Scheme 242
Fit special tool 11 3 260 to cylinder head and screw into spark plug threads in cylinders 1 and 4.
Scheme 243
Turn the eccentric shaft to tension the bearing caps.
Tighten down bearing cover.
Tightening torque, refer to 11 31 1AZ in CAMSHAFT .
Scheme 244
Remove special tool 11 3 260.
Important!
Do not damage the cylinder head.
If necessary, machine open-end wrench accordingly.
Align camshafts with open-end wrench.
Scheme 245
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 246
Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.
Scheme 247
Lift timing chain and hold under tension.
Scheme 248
Turn engine from 30° before TDC position in direction of rotation as far as TDC position.
Secure crankshaft in firing TDC position with special tool 11 2 300.
Important!
Remove special tool 11 2 300 before starting engine.
Scheme 249
Automatic Transmissions Only
Illustration does not show automatic transmission.
Important!
On engines with automatic transmissions, there is shortly before the special tool bore (1) a large bore (2) which can be confused with the special tool bore.
Scheme 250
If special tool 11 2 300 is secured in the correct bore (1), the engine can no longer be cranked at the central bolt.
Position sensor gear on inlet camshaft.
Scheme 251
Fit thrust washer and tighten down with dowels.
Tightening torque, refer to 11 31 1AZ in CAMSHAFT .
Scheme 252
Feed chain wheel onto timing chain so that arrow on chain wheel faces separating face of upper side of cylinder head.
Scheme 253
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.
Check arrow on chain wheel to separating face of upper side of cylinder head, reposition chain wheel if necessary.
Scheme 254
Insert and tighten down screw-in pin.
Tightening torque, refer to 11 31 11AZ in CAMSHAFT .
Scheme 255
Install secondary chain tensioner.
Scheme 256
Fit toothed sleeve (6) and align to toothed shaft in camshaft so that tooth gaps are opposed.
Scheme 257
Secure toothed shaft (5).
Insert pin of toothed shaft (5) into tooth gaps of splines on camshaft and toothed sleeve (6).
Scheme 258
Push in toothed shaft (5) until the longitudinal holes in the toothed sleeve (6) are positioned centrally with respect to the thread.
Scheme 259
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 260
Important!
Do not alter position of chain wheels with respect to chain when removing from special tool 11 6 180.
Remove chain with sprocket wheels positioned from special tool 11 6 180 and so that tooth spaces oppose each other on inlet side.
Scheme 261
Align chain with sprocket wheels so that tooth spaces are positioned exactly over each other on inlet side.
Scheme 262
Secure toothed shaft (4).
Insert pin of toothed shaft (4) into tooth gaps of splines on camshaft and chain wheel.
Scheme 263
Push in toothed shaft (4) until approx. 1 mm of splines can still be seen.
Scheme 264
Note installation direction of corrugated washer (7), "FRONT" lettering must be visible.
Scheme 265
Install corrugated washer, tighten nuts by hand but do not tighten down fully yet.
Insert screws on exhaust side, initially tighten to approx. 5 Nm and then slacken off again half a turn.
Scheme 266
Fit thrust washer (3).
Scheme 267
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
Install cup spring (2) so that small locating diameter of spring (2) points to sensor gear.
Fit cup spring (2) in position.
Scheme 268
Position sensor gear (1) so that arrow on sensor gear faces separating face of upper side of cylinder head.
Install nuts and tighten by hand but do not tighten down fully yet.
Scheme 269
Withdraw toothed shaft (5) up to stop.
Scheme 270
Press down secondary chain tensioner at top and remove special tool 11 3 292.
Scheme 271
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 272
Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.
Scheme 273
Important!
Do not tighten down nuts fully.
Remove gasket.
Check dowel sleeves (1) for damage and correct installation position.
Scheme 274
Keep sealing face clean and free of oil.
Important!
Fit special tool 11 6 150 "without gasket" only.
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 6 160 is in full contact with cylinder head.
Scheme 275
Insert screws (1) on exhaust side and initially tighten to approx. 5 Nm.
Scheme 276
Initially tighten nuts (2) on exhaust side and nuts (3) on inlet side to approx. 5 Nm.
Scheme 277
Tighten down screws (1) on exhaust side.
Tightening torque, refer to 11 31 3AZ in CAMSHAFT .
Scheme 278
Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.
Tightening torque, refer to 11 31 11AZ in CAMSHAFT .
Scheme 279
Pull special tool 11 2 300 back until flywheel is no longer secured in position.
Scheme 280
Remove special tool 11 3 244 and special tool 11 3 240.
Scheme 281
Crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.
Scheme 282
Secure crankshaft in firing TDC position with special tool 11 2 300.
Important!
Do not turn the engine back.
Remove special tool 11 2 300 before switching on the engine.
Scheme 283
Fit special tool 11 3 240 to camshafts.
Scheme 284
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 285
Remove special tool 11 6 150.
Scheme 286
Install VANOS adjustment unit. Refer to 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)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 9 200
- 11 2 300
- 11 3 240
- 11 3 450
- 11 4 220
Necessary Preliminary Tasks
- Remove fan impeller with fan clutch. Refer to Refer to «11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56)»(ref-202354-S21527927182005102700000) .
- Remove cylinder head cover. Refer to «11 12 000 REMOVING AND INSTALLING, SEALING CYLINDER HEAD COVER (M52TU / M54 / M56)»(ref-202354-S16007865842005102700000) .
- Remove all spark plugs. Refer to «12 12 011 REPLACING ALL SPARK PLUGS»(ref-202355-S41420243292005102700000) .
Detach cover for inlet camshaft.
Scheme 287
Important!
Cylinder for chain tensioning piston is under spring pressure.
Remove cylinder for chain tensioning piston.
Scheme 288
Install special tool 11 4 220.
Fit adjusting screw to bow cover.
Scheme 289
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 290
Unscrew oil pressure pipe.
Scheme 291
Mount special tool 11 3 450 with banjo bolt of oil pressure line.
Scheme 292
Important!
Cover double VANOS adjustment unit; when the compressed air supply is connected, several drops of oil are sprayed out of the bore.
Scheme 293
Connect compressed air (2 to 8 bar).
Scheme 294
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 295
Pull dust guard out of the special tool bore.
Scheme 296
Secure crankshaft with special tool 11 2 300 in TDC firing position of 1st cylinder.
Important!
Do not turn the engine back.
Remove special tool 11 2 300 before starting engine.
Scheme 297
Automatic Transmissions Only
Illustration does not show automatic transmission.
Important!
On engines with automatic transmissions, there is shortly before the special tool bore (1) a large bore (2) which can be confused with the special tool bore (1)
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 298
Unscrew studs.
Scheme 299
Place special tool 11 3 240 on camshafts.
Scheme 300
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. If necessary, adjust camshaft timing. Refer to 11 31 505 ADJUSTING CAMSHAFT TIMING (M52TU / M54 / M56) .
Scheme 301
Detach compressed air connection.
Remove special tool 11 3 450.
Scheme 302
Fit oil pressure line with new seals.
Scheme 303
Tightening torque, refer to 11 36 2AZ in 11 36 VARIABLE CAMSHAFT CONTROL .
Remove special tool 11 3 240.
Scheme 304
Remove special tool 11 2 300.
Install dust guard from inspection bore.
Scheme 305
Unfasten and remove special tool 11 4 220.
Scheme 306
Install cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56) .
Scheme 307
Assemble engine.
11 31 090 Removing and installing/replacing chain tensioning piston (M52 / M52TU / M54 / M56)
Important!
Spring pressure!
Unfasten cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56) .
Scheme 308
Installation
Replace sealing ring.
Tightening torque, refer to 11 31 8AZ in CAMSHAFT .
Arrangement of components
- Cylinder for chain tensioning piston.
- Sealing ring.
- Spring.
- Piston.
Scheme 309
11 31 505 Adjusting camshaft timing (M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 9 250
- 11 2 300
- 11 3 240
- 11 3 244
- 11 3 292
- 11 4 220
- 11 5 180
- 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 310
Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.
Important!
Do not turn the engine back.
Remove special tools 11 2 300 /11 5 180 before starting engine.
Scheme 311
Unscrew studs.
Scheme 312
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 313
Important!
Cylinder for chain tensioning piston is under spring pressure.
Remove cylinder for chain tensioning piston.
Scheme 314
Install special tool 11 4 220.
Fit adjusting screw to bow cover.
Scheme 315
Release screws (1) by half a turn.
Scheme 316
Release nuts (2) by two turns
Release nuts (3) by one turn.
Scheme 317
Important!
Toothed shaft (4) slips very easily from splines.
Pull out toothed shaft (4) until approx. 1 mm of splines can be seen.
Scheme 318
Withdraw toothed shaft (5) up to stop.
Scheme 319
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 320
Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.
Scheme 321
Press down chain tensioner at top and remove special tool 11 3 292.
Scheme 322
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 323
Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.
Important!
Do not tighten down nuts fully.
Scheme 324
Remove gasket.
Check dowel sleeves (1) for damage and correct installation position.
Scheme 325
Keep sealing face clean and free of oil.
Important!
Fit special tool 11 6 150 "without gasket" only.
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 326
Insert screws (1) on exhaust side and initially tighten to approx. 5 Nm.
Scheme 327
Initially tighten nuts (2) on exhaust side and nuts (3) on inlet side to approx. 5 Nm.
Scheme 328
Tighten down screws (1) on exhaust side.
Tightening torque, refer to 11 31 3AZ in CAMSHAFT .
Scheme 329
Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.
Tightening torque, refer to 11 31 11AZ in CAMSHAFT .
Scheme 330
Pull special tool 11 2 300/11 5 180 back until flywheel is no longer secured.
Scheme 331
Remove special tool 11 3 244 and special tool 11 3 240.
Scheme 332
Crank engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.
Scheme 333
Secure crankshaft in firing TDC position with special tool 11 2 300.
Important!
Do not turn the engine back.
Remove special tools 11 2 300 / 11 5 180 before starting engine.
Scheme 334
Fit special tool 11 3 240 to camshafts.
Scheme 335
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 336
Unfasten and remove special tool 11 4 220.
Scheme 337
Install cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56) .
Scheme 338
Remove special tool 11 2 300 / 11 5 180.
Scheme 339
Remove special tool 11 6 150.
Scheme 340
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
- Valve.
- Valve-stem seals.
- Lower plate spring.
- Valve spring.
- Top plate spring.
- Valve tapers.
Scheme 341
11 34 560 Replacing all valve stem seals (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 1 200
- 11 1 480
- 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 342
Lubricate valve stem with oil and insert valve. Fit special tool 11 1 960.
Coat new valve stem seal (1) with oil and install.
Scheme 343
Press valve stem seal firmly home by hand with special tool 11 1 200.
Scheme 344
11 34 715 Replacing all valve springs (M52 / S52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 0 342
- 11 0 345
- 11 1 045
- 11 1 065
- 11 1 441
- 11 3 030
- 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 345
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 346
Insert special tool 11 1 441 from below in special tool 11 1 065 and secure with special tool 11 1 045.
Scheme 347
Align special tool 11 0 345 in direction of valve shaft and select appropriate groove in special tool 11 0 342.
Scheme 348
Press down valve spring on spring cap, top, and remove valve keys.
Remove valve spring and plate spring.
Scheme 349
Arrangement
Scheme 350
- Valve.
- Valve-stem seal.
- Lower plate spring.
- Valve spring.
- Top plate spring.
- Valve tapers.
11 40 000 Checking engine oil pressure
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 4 050
- 13 3 061
- 13 3 063
- 13 6 051
- 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, refer to 11 42 2AZ in 11 42 OIL FILTER AND PIPES .
Remove oil pressure switch.
Installation
Tightening torque, refer to 12 61 1AZ in OIL PRESSURE, OIL TEMPERATURES .
Install special tool 11 4 050 with sealing ring (1) in place of oil pressure switch.
Scheme 351
Checking Engine Oil Pressure With DIS Tester
Attach special tool 13 6 054 with sealing ring (1) and special tool 136051 and connect to DIS Tester.
Scheme 352
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 OILS SUPPLY .
11 41 000 Removing and installing/replacing oil pump (M52TU / M54 / M56)
Remove oil sump. Refer to 11 13 000 REMOVING AND INSTALLING OIL SUMP (M52 / S52 / M52TU / M54) or 11 13 000 REMOVING AND INSTALLING, SEALING OR REPLACING OIL SUMP (M52TU / M54 / M56) .
| CAUTION | Left-hand threads. Unfasten nut. |
Scheme 353
Installation
Tightening torque, refer to 11 41 4AZ in OIL PUMP WITH FILTER .
Remove sprocket with chain.
Scheme 354
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. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56) .
Scheme 355
Version 2
Oil pump and oil scraper - two parts
Release screws and remove oil pump intake pipe. Refer to 11 41 000 REMOVING AND INSTALLING/REPLACING OIL PUMP (M52TU / M54 / M56) .
Scheme 356
Version 2
Oil pump and oil scraper - two parts
Release screws and remove oil pump.
Scheme 357
Installation
Check dowel sleeves (1) for damage and correct installation position.
Scheme 358
Installation
Replace O-ring on intake pipe.
Scheme 359
If necessary, remove control piston.
Scheme 360
Press sleeve downwards with suitable drift.
| CAUTION | The sleeve for the control plunger is under spring pressure. |
Remove circlip.
Installation
Scheme 361
- Control plunger.
- Spring.
- Sleeve.
- O-ring (replace).
- 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 engine oil service instructions, 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 (M52, M52TU, S50US, S52, M54, M56)
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. Refer to 11 28 010 REPLACING ALTERNATOR DRIVE BELT (M52 / S52 / M52TU / M54 / M56) .
Scheme 362
Remove connector for oil pressure switch.
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 363
Installation
Replace seal.
Scheme 364
Top up engine oil.
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) .
Scheme 365
Note. M52TU / M54 / M56: Water drain plug is located on exhaust side on cylinder 2 in engine block.
Drain and dispose of coolant.
Installation
Replace seal.
Tightening torque, refer to 11 11 5AZ in 11 11 ENGINE BLOCK .
Release belt pulley.
Scheme 366
Release water pump.
Scheme 367
Tighten two screws (M 6) into thread of water pump and remove water pump out of timing case.
Scheme 368
Installation
Replace O-ring and coat with coolant as anti-friction agent.
Scheme 369
11 52 020 Removing and installing/replacing fan clutch (S52 / S54 / M52 / M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 5 030
- 11 5 040
If necessary, remove air duct.
Scheme 370
Important!
Left-hand threads.
Using special tool 11 5 030. Grip pulley and unfasten cap nut from water pump using special tool 11 5 040.
Scheme 371
If necessary, unfasten fan cowl.
Take the fan wheel with fan coupling off the water pump and remove.
Installation
Tighten down fan impeller using special tool 11 5 040.
Tightening torque, refer to 11 52 1AZ in FAN .
Note. When using special tool 11 5 040. 30 Nm on the torque wrench scale are equivalent to a tightening torque of 40 Nm.
Scheme 372
Unfasten screws and detach fan from fan coupling.
11 53 000 Removing and installing/replacing coolant thermostat (M52TU / M54 / M56)
Remove fan clutch with fan impeller and fan cowl. Refer to 11 52 020 REMOVING AND INSTALLING/REPLACING FAN CLUTCH (S52 / S54 / M52 / M52TU / M54 / M56) .
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, refer to 11 11 5AZ in 11 11 ENGINE BLOCK .
Scheme 373
Pull locks and disconnect water hoses.
Installation
Refer to 17 00 ...INSTRUCTIONS FOR WORKING ON COOLING SYSTEM for general instructions for working on cooling systems.
Loosen nut (1).
Scheme 374
Release screws on thermostat housing, remove thermostat housing.
Installation
Keep sealing faces clean and free of oil.
Scheme 375
Note. Coolant thermostat is integrated in coolant thermostat housing and can only be replaced as a single unit.
Installation
Replace seal (1).
Scheme 376
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.
| CAUTION | 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 plug connections (1) from holders.
Scheme 377
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.
Pull off retainer (1).
Scheme 378
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 379
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.
| CAUTION | Catch and dispose of fuel as it escapes. |
Instructions for removing and installing fuel hoses, refer to INJECTION NOZZLE AND L... .
Unclip fuel line (1) from holder (2).
Scheme 380
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 THROTTLE AND OPERATION .
Disconnect plug connections and lay cable duct to one side.
Unclip plug connection (1) for knock sensors from holder.
Scheme 381
Release nut (2) on manifold support.
Release nuts on manifold.
Scheme 382
Note. Engines with air injection: Detach vacuum line on reverse side of intake air manifold.
Remove intake air manifold. Refer to 11 61 050 REMOVING AND INSTALLING INTAKE AIR MANIFOLD (M54) .
Installation
Check gaskets on all cylinders and replace if necessary.
Scheme 383
Installation
Check rubber dampers and if necessary replace together with manifold support.
Scheme 384
11 62 140 Removing and installing both exhaust manifolds with catalytic converter (M52TU / M54)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 00 0 200
- 00 0 201
- 00 0 202
- 00 0 204
- 00 0 206
Remove reservoir for windshield cleaning system.
Remove suction-filter housing.
Scheme 385
Prepare special tool 00 0 200 comprising special tools 00 0 201/00 0 202/00 0 204/00 0 206.
Scheme 386
| CAUTION | Risk of damage. Do not damage lines, cables or hoses. |
Version with air conditioning
A/C system lines remain connected. Detach drier bottle on mounting to body.
Place special tool 00 0 206 on engine carrier.
Scheme 387
Carefully lift engine approx. 5 mm.
Scheme 388
Remove cover from injection valves.
| CAUTION | 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 connection. Unclip cable on rear side of engine from cable guide.
Remove engine splash guard.
Remove exhaust system.
Note. The oxygen sensors are in danger of being damaged when the exhaust manifolds are removed and installed.
Remove oxygen monitor sensors. Refer to 11 78 613 REPLACING BOTH OXYGEN MONITOR SENSORS (M52TU / M54 / M56) .
Remove oxygen control sensors. Refer to 11 78 510 REPLACING OXYGEN CONTROL SENSOR (M52TU / M54 / M56) .
Remove right engine support arm from engine block.
Remove right engine mount from front axle support.
Note. Rear exhaust manifold with catalytic converter can only be removed after front exhaust manifold with catalytic converter has first been removed. Remove front exhaust manifold with catalytic converter. Remove rear exhaust manifold with catalytic converter.
Installation
Clean sealing faces, replace gaskets.
Coat thread with copper paste -CRC-.
Replace nuts.
Tightening torque, refer to 11 62 1AZ in EXHAUST MANIFOLD .
11 78 510 Replacing oxygen control sensor (M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 7 020
Check function of Digital Engine Electronics (DME). Refer to CHECKING - SETTING ENGINE .
Read out fault memory, clear if necessary.
Scheme 389
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.
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 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.
Scheme 390
Installation
Secure oxygen control sensor with special tool 11 7 020.
Tightening torque, refer to 11 78 1AZ in EMISSIONS CONTROL OXYGEN .
Pay attention to cable routing of oxygen control sensor.
11 78 613 Replacing both oxygen monitor sensors (M52TU / M54 / M56)
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 7 020
- 11 7 030
Check function of Digital Engine Electronics (DME). Refer to CHECKING - SETTING ENGINE .
Read out fault memory, clear if necessary.
Illustrations show M54.
Remove cover from fuel injectors.
Scheme 391
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.
Release oxygen monitor sensor from cylinders 1 to 3 with special tool 11 7 030.
Scheme 392
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 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 393
Secure oxygen monitor sensor for cylinders 4 to 6 with special tool 11 7 020.
Tightening torque, refer to 11 78 1AZ in EMISSIONS CONTROL OXYGEN .
Cover oxygen monitor sensors when applying underseal.
Pay attention to cable routing of oxygen monitor sensors.
