Replacing Both Camshafts
11 31 001 Replacing camshafts (M57T2- SCR)Special tools required:
Necessary preliminary work:
^ Remove vacuum pump
^ Removing 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.
Undo screw plug in 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).
Release bearing journals (2) of guide rails.
Installation Note:
Replace bearing journals (2).
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.
Release screws (1) of camshaft bearing cap in 1/2 revolution increments evenly from outside to inside.
Remove bearing caps and camshafts.
All bearing caps are marked.
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
Align camshafts so that cam peaks of intake and exhaust camshafts of 1st cylinder point in direction of travel to right.
Note:
See graphic.
Install camshaft.
Align marking (1) on intake camshaft flush with cylinder head.
Marking (2) on exhaust camshaft flush with cylinder head.
Mark (1) on intake camshaft must be between marks (2) on exhaust camshaft.
See graphic.
The intake camshaft bearing caps are marked E 1 ... E 7 from the exhaust side.
The exhaust camshaft bearing caps are marked A 1 ... A 7 from the exhaust side.
Fit bearing caps.
Insert all screws (1) and initially tighten so that they are free of play.
Tighten down camshaft bearing caps in 1/2 revolution increments evenly from inside to outside.
Screw special tool 11 6 254 onto cylinder head.
Note:
See graphic.
Check intake camshaft side clearance.
Set up special tool 11 6 250 with dial gauge.
Refer to Technical Data.
Adjust valve timing.
Assemble engine.
