Removing and Installing/Replacing Inlet Camshaft
11 31 025 Removing and installing or replacing the intake camshaft (M57T2- SCR)Special tools required:
Necessary preliminary work:
^ Remove cylinder head cover
Crank engine at crankshaft with special tool 11 6 480.
The cams on the intake camshaft at the 1st cylinder point downwards.
Release screw (1).
Note:
Bolt (1) must be removed beforehand as it is no longer accessible in TDC setting.
Camshaft sprocket classification (0) value from 0 to 9
Tightening torque 11 31 1AZ.
Unscrew the screw plug in the gear case cover at bottom.
Important!
No piston is permitted to be in the TDC setting Risk of damage.
Crank engine back at crankshaft through 45°.
Turn exhaust camshaft at hexagon head in direction of arrow.
The hydraulic chain tensioner can be secured in place in this position with special tool 11 3 340.
Note:
The hydraulic chain tensioner is forced back by rotating the exhaust and intake camshafts.
Lock hydraulic chain tensioner with special tool 11 3 340.
Note:
If the camshaft sprocket is removed without the hydraulic chain tensioner being locked, the chain tensioner piston will slip out and can then only be pressed back again with a considerable amount of effort.
Remove protective cap in direction of arrow.
Installation Note:
Reinstall protective cap with some grease.
Crank engine at crankshaft with special tool 11 6 480.
Secure crankshaft at flywheel with special tool 11 6 080.
Release camshaft sprocket bolts (1).
Tightening torque 11 31 1AZ.
Release bearing journal (2) of guide rails.
Release camshaft sprocket with chain (1) from intake camshaft in direction of arrow.
Release guide rail (2) from bracket and pull out in direction of arrow.
Remove camshaft sprocket (2) in direction of arrow to right from timing chain (3) and remove towards top.
Loosen screws (1) of intake camshaft bearing cap in 1/2 revolution increments evenly from outside to inside.
Note:
Illustration shows M57TU.
Remove bearing caps of intake camshaft and lift out intake camshaft (1).
All bearing caps are marked.
E= intake camshaft.
A = exhaust camshaft.
Note:
Worn rocker arms may only be reused on the same grooves of the camshaft.
Important!
These screws must "not" be removed.
Note:
E Intake camshaft
A Exhaust camshaft
Insert intake camshaft.
Position (1) of intake camshaft gear flush with cylinder head.
Position (2) of exhaust camshaft gear flush with cylinder head.
If necessary, re-secure camshafts.
Mark (1) on intake camshaft must be between marks (2) on exhaust camshaft.
See graphic.
The intake camshaft bearing caps are legibly marked E 1 ... E 7 from the exhaust side.
Fit bearing caps.
Insert all screws (1) and initially tighten so that they are free of play.
Tighten down intake camshaft bearing caps in 1/2 revolution increments evenly from inside to outside.
Mount camshaft sprocket and release chain tensioner.
Cams of both camshafts must point to top right.
Fit special tool 11 6 321 on intake camshaft.
Secure special tool 11 6 321 with special tool 11 6 322.
Installation Note:
The exhaust camshaft only has to be checked, setting is not possible.
Secure special tool 11 6 254 on the cylinder head with screws (1).
Note:
See graphic.
Check intake camshaft side clearance.
Set up special tool 11 6 252 with dial gauge.
Refer to Technical Data.
Procedure for exhaust camshaft is identical.
Adjust valve timing.
Assemble engine.
