11 41 010 Removing and Installing/Replacing Chain Module For Oil Pump/Vacuum Pump
11 41 010 Removing and installing or replacing chain module for oil pump/vacuum pump (N52T)Special tools required:
Important!
Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminium screws/bolts exclusively.
Aluminium screws/bolts must be replaced each time they are released.
Aluminium screws/bolts are permitted with and without colour 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).
Necessary preliminary work:
^ Remove cylinder head cover
^ Remove oil sump
^ Remove drive belt
^ Remove drive belt tensioner
^ Remove vibration absorber
^ Remove sealing cap for vacuum pump
^ Check timing
^ Remove chain tensioner.
Procedure on installed engine:
Turn sprocket (3) 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 (3) and special tool 11 4 362.
Release screw (2) for sprocket (3).
Tightening torque 11 66 2AZ.
Press timing chain with chain tensioner (1) in direction of arrow.
Disconnect timing chain with special tool 11 4 120.
Feed out camshaft sprocket (3) at hexagon head (4) of vacuum pump.
Installation note:
If the chain module is replaced, a mounting bar (2) is already pre-installed.
Note:
To release bolt (1), insert a 6 mm drill bit between sprocket and oil pump housing.
Release screw (1) for camshaft sprocket.
Tightening torque 11 41 6AZ.
Release screws (2) for chain module.
Tightening torque 11 41 5AZ.
Installation note:
Replace aluminium screws.
Important!
To release central bolt (1), remove special tool 11 0 300.
Employ a second person for gripping when releasing central bolt (1).
Screw special tool 11 9 280 onto hub of vibration absorber.
Release central bolt (1).
Tightening torque 11 21 1AZ.
Installation note:
Replace central bolt (1).
Remove hub (2) towards front.
Installation note:
Replace crankshaft seal at front.
Open screw plug on bedplate.
Tightening torque 11 11 8AZ.
Graphic N42.
Release aluminium screw (1) with special tool 11 8 640.
Tightening torque 11 41 4AZ.
Installation note:
Replace aluminium screws.
Remove chain module (1) in direction of arrow.
Important!
Note direction of installation of camshaft sprocket (2).
Collar (see arrow) on camshaft sprocket (2) points to engine.
Incorrect assembly will result in engine damage.
Procedure on removed engine:
Note:
Engine is mounted on special tool 11 4 440.
Release screw (1) for vacuum pump sprocket.
Tightening torque 11 66 2AZ.
Release screw (2) for oil pump sprocket.
Tightening torque 11 41 6AZ.
Release central bolt (3).
Tightening torque 11 21 1AZ.
Installation note:
Replace central bolt (3).
Remove hub (4) towards front.
Install hub with new central bolt.
Tighten down special tool 11 5 200 with screws (1) to hub.
Remove tensioner for drive belt.
Screw in special tool 11 4 362 from special tool set 11 4 360.
Mount special tool 11 9 280 on 11 5 200.
Support special tool 11 9 280 on special tool 11 4 362.
Tighten central bolt to jointing torque.
Tightening torque 11 21 1AZ.
Mark central bolt and hub with paint.
Special tool 11 0 300 secures crankshaft.
Mark special tools with colored line (1).
See picture.
Important!
Do not remove the special tool while tightening the central bolt to angle of rotation.
Risk of damage!
If necessary, tighten central bolt to angle of rotation with special tool 00 9 140.
Tightening torque 11 21 1AZ.
Rotate crankshaft at central bolt into TDC setting.
Slide special tool 11 0 300 in direction of arrow into dowel hole and secure crankshaft.
Important!
On vehicles with automatic transmission, there is a large bore hole for the TDC position shortly before the dowel bore. This bore can be confused with the dowel hole.
If the flywheel is secured in the correct dowel hole with special tool 11 0 300, the engine can no longer be moved at the central bolt.
Installation note:
Replace crankshaft seal at front.
Adjust valve timing
Assemble engine.
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