11 36 010 Removing and installing or replacing double VANOS adjustment unit (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 3 450
- 11 4 220
- 11 6 170
Necessary Preliminary Tasks
- Remove intake filter housing with air-mass flow sensor
- Remove fan impeller with fan clutch and fan cowl. 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 spark plugs. Refer to «12 12 011 REPLACING ALL SPARK PLUGS»(ref-202355-S41420243292005102700000).
Removal
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 1
Unscrew oil pressure pipe.
Scheme 2
Mount special tool 11 3 450 with banjo bolt of oil pressure line.
Scheme 3
Important!
Cover double VANOS adjustment unit.
When the compressed air supply is connected, several drops of oil are sprayed out of the bore.
Scheme 4
Connect compressed air (2 to 8 bar).
Scheme 5
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 6
Pull dust guard out of the special tool bore.
Scheme 7
Secure crankshaft in firing TDC position with special tool 11 2 300.
Important!
Remove special tool 11 2 300 before switching on the engine.
Scheme 8
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.
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 9
Unscrew studs.
Scheme 10
Secure camshafts with special tool 11 3 240.
Scheme 11
Detach compressed air connection.
Note. Special tool 11 3 450 still remains fitted.
Scheme 12
Important!
Oil escapes after screw plugs have been removed. Have cleaning cloths and container ready.
Make sure no oil runs onto belt drive. Remove any remnants of oil immediately with cleaning cloth.
Remove screw plugs, catch escaping oil on inlet and exhaust sides.
Scheme 13
Remove sealing caps with special tool 11 6 170 or with commercially available short flat nose pliers.
Scheme 14
Important!
Left-hand threads.
Release fitting screws on inlet and exhaust sides.
Scheme 15
Detach plug connections from camshaft sensor and solenoid valves on exhaust and inlet sides.
Scheme 16
Unscrew suspension eye.
Scheme 17
Release nuts and remove double VANOS adjustment unit. Refer to 11 36 010 REMOVING AND INSTALLING OR REPLACING DOUBLE VANOS ADJUSTMENT UNIT (M52TU / M54 / M56).
Scheme 18
Important!
With double VANOS adjustment unit removed
Do not crank engine.
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
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 19
Keep sealing faces clean and free of oil. Apply a thin and even coat of sealing compound Drei Bond 1209 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 20
Attach plug connections of camshaft sensor and solenoid valves on exhaust and inlet sides.
Scheme 21
Important!
Left-hand threads.
Insert fitting screws for hydraulic piston on toothed shaft on inlet and exhaust sides and tighten down.
Tightening torque, refer to 11 36 4AZ in VARIABLE CAMSHAFT TIMING.
Scheme 22
Replace sealing caps and install with special tool 11 6 170 or with commercially available short flat nose pliers.
Scheme 23
Insert screw plugs with new sealing rings and tighten down.
Tightening torque, refer to 11 36 3AZ in VARIABLE CAMSHAFT TIMING.
Scheme 24
Fit suspension lug.
Scheme 25
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.
Important!
Cylinder for chain tensioning piston is under spring pressure.
Remove cylinder for chain tensioning piston. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56).
Scheme 26
Insert special tool 11 4 220 in cylinder head and bring adjustment screw into contact with tensioning rail.
Scheme 27
Preload tensioning rail with special tool 11 4 220 by rotating adjusting screw with special tool 11 9 250 or standard torque wrench to 0.7 Nm.
Scheme 28
Pull special tool 11 2 300 back until flywheel is no longer secured in position.
Scheme 29
Remove special tool 11 3 240.
Scheme 30
Important!
Cover double VANOS adjustment unit; when the compressed air supply is connected, several drops of oil are sprayed out of the bore.
Scheme 31
Connect compressed air (2 to 8 bar).
Scheme 32
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 33
Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.
Important!
Do not turn the engine back.
Remove special tool 11 2 300 before switching on the engine.
Scheme 34
Check camshaft setting
Fit special tool 11 3 240 to camshafts.
Scheme 35
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 36
Detach compressed air connection.
Remove special tool 11 3 450.
Scheme 37
Fit oil pressure line with new seals.
Tightening torque, refer to 11 36 2AZ in 11 36 VARIABLE CAMSHAFT CONTROL.
Scheme 38
Unfasten and remove special tool 11 4 220.
Scheme 39
Install cylinder for chain tensioning pistons. Refer to 11 31 090 REMOVING AND INSTALLING/REPLACING CHAIN TENSIONING PISTON (M52 / M52TU / M54 / M56).
Scheme 40
Remove special tool 11 3 240.
Scheme 41
Remove special tool 11 2 300.
Scheme 42
Assemble engine.
11 36 570 Replacing solenoid valve for inlet side on VANOS adjustment unit
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 32 2 110
Necessary Preliminary Tasks
- Read out fault memory of DME control unit.
- Check stored fault messages.
- Switch off ignition.
Unlock hose (1) and detach.
Unlock plug (2) and remove.
Scheme 43
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.
Installation
Release solenoid valve with special tool 32 2 110.
Scheme 44
Tightening torque, refer to 11 36 1AZ in VARIABLE CAMSHAFT TIMING.
Now clear the fault memory.
11 36 575 Replacing solenoid valve for exhaust side on VANOS adjustment unit
Note. For Special Tool identification, see SPECIAL TOOLS - Z3 .
Special Tools Required
- 11 6 420
Necessary Preliminary Tasks
- Read out fault memory of DME control unit.
- Check stored fault messages.
- Switch off ignition.
Unlock plug (1) and remove.
Cut through cable tie (2).
Scheme 45
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 11 6 420.
Scheme 46
Installation
Tightening torque, refer to 11 36 1AZ in VARIABLE CAMSHAFT TIMING.
Now clear the fault memory.
See also:
• REMOVAL & INSTALLATION