Removing and installing or replacing chain module for oil pump/vacuum pump (S55 engine)
Special tools required:
- 00 9 140
- 11 0 290
- 11 0 300
- 11 4 120
- 11 4 280
- 11 8 640
- 11 8 650
- 11 9 260
- 2 303 793
Attention!
Aluminium screws/bolts must be replaced each time they are released .
Aluminium screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminium screws/bolts are not magnetic .
Jointing torque and angle of rotation must be observed without fail (risk of damage) .
Attention!
After each release of the central bolt on the crankshaft, the following components must be replaced without fail.
- Central bolt
- Eka grip disc
- Camshaft sprocket with the welded-on Eka grip discs
- Camshaft sprocket for the timing chain drive
Necessary preliminary work:
- Remove CYLINDER HEAD COVER .
- Remove all SPARK PLUGS .
- Remove OIL SUMP .
- Remove DRIVE BELT .
- Remove drive belt TENSIONING DEVICE .
- Remove VIBRATION DAMPER .
- Remove SEALING CAP for vacuum pump
- Remove SEALING CAP for oil pump chain tensioner
- Remove TIMING CHAIN .
- Remove COOLANT PUMP .
Screw in special tool 11 8 650 on screw connection of belt tensioner on crankcase.
Turn camshaft sprocket with central bolt at crankshaft into position until special tool 11 0 290 can be secured.
Simultaneously secure special tool 11 0 290 to sprocket and special tool 11 8 650.
Central bolt for camshaft sprocket.
Tightening torque 11 66 2AZ .
Attention!
Before releasing the central bolt on the oil pump, the hydraulic chain tensioner must be drained.
Carefully press tensioning rail (1) with a suitable screwdriver (2) in direction of arrow.
As the oil pressure in the chain tensioner can only be drained pulsating, the tensioning rail (1) must be pressed several times.
Press the tensioning rail (1) and hold down.
Chain tensioner piston with a suitable lock pin (2) with a diameter of 2.5 to 3 mm.
Loosen screws (3).
Tightening torque: 11 41 8AZ .
Secure special tool 2 303 793 to crankcase.
Release oil pump central bolt (1).
Tightening torque 11 41 9AZ .
Remove fastener (1) in direction of arrow.
Position flywheel with special tool 11 0 300 in TDC setting.
Release screws (1).
Remove oil pump drive gear from the drive shaft.
Open screw plug (1).
Tightening torque: 11 11 7AZ .
Installation note:
Replace the sealing ring.
Lock flywheel (1) with special tool 11 9 260.
Attention!
Do not remove special tools 11 0 300 and 11 4 280 to release central bolt (1).
Release central bolt (1).
Installation note:
Release central bolt (1) with 3/4 tool (2).
Breakaway torque approx. 500 Nm.
Screw in two screws (1) and remove hub (2) in direction of arrow.
Installation note:
Replace front CRANKSHAFT SEAL .
Release aluminium screw (1) with special tool 11 8 640.
Remove chain module (1) in direction of arrow.
Installation:
Attention!
Note installation direction of sprocket (2).
Collar (see arrow in illustration) on sprocket (2) points to engine .
Incorrect assembly will result in engine damage .
Insert chain module.
Secure screw (1) with special tool 11 8 640.
Tightening torque: 11 41 7AZ .
Insert aluminium screws (1) for chain module.
Tightening torque 11 41 9AZ .
Installation note:
Replace aluminium screws .
Pay attention to mounting flats on oil pump drive.
Position module (1) for oil pump drive.
Position module (2) for camshaft drive.
Insert hub (3) for vibration absorber with grip disc.
Fit central bolt (1).
Secure central bolt with special tool 100 9 140.
Tightening torque 11 21 1AZ .
Assemble engine.