Camshaft: Adjustments

Adjusting Camshaft Timing:

Before performing the adjustment work, check timing of camshaft, refer to Testing and Inspection, Procedures. Testing and Inspection





Rotate engine engine-wise until cam tips on intake and exhaust camshafts on 1st cylinder face one another.





Secure crankshaft with special tool 11 2 300 in TDC position of 1st cylinder.

Caution:
^ Do not turn the engine back.
^ Remove special tool 11 2 300 before switching on the engine.





Unscrew studs.
Remove double VANOS adjustment unit, refer to Service and Repair, Removing and Installing or Replacing VANOS Adjustment Unit.





Press down secondary chain tensioner at top and lock with special tool 11 3 292.





Caution:
^ Cylinder for chain tensioning piston is under spring pressure.
^ Remove cylinder for chain tensioning piston.





Install special tool 11 4 220.
Fit adjusting screw to bow cover.





Release screws (1) by half a turn.





Release nuts (2) by two turns.
Release nuts (3) by one turn.





Caution: Toothed shaft (4) slips very easily from splines.

Carefully withdraw toothed shaft (4) until approx. 1 mm of splines can be seen.





Withdraw toothed shaft (5) up to stop.





Fit special tool 11 3 240 to camshafts on cylinder 6.
Align camshafts until special tool 11 3 240 locates on cylinder head without gap.





Attach special tool 11 3 244 to special tool 11 3 240 and locate by way of spark plug thread.





Press down secondary chain tensioner at top and remove special tool 11 3 292.





Preload tensioning rail cover with special tool 11 4 220 by rotating the adjusting screw with special tool 00 9 250 or standard torque wrench to 0.7 Nm.





Preload cup spring slightly by pressing on sensor gear (1) and tighten nuts by hand.

Caution: Do not tighten down nuts fully.





Remove gasket.
Pay attention to adapter sleeves (1).
Keep sealing face clean and free of oil.





Caution:
^ The special tool 11 6 150 may only be attached "without the gasket".
^ If the gasket remains underneath the special tool 11 6 150, the camshaft timing will be "incorrectly" set.
^ Attach special tool 11 6 150 "without gasket", tighten nuts by hand and then tighten down uniformly until special tool 11 6 150 is in full contact with cylinder head.





Bring screws (1) on exhaust side into contact by initially tightening to approx. 5 Nm.





Bring nuts (2) on exhaust side and nuts (3) on inlet side into contact by initially tightening to approx. 5 Nm.





Tighten down screws (1) on exhaust side.
Tightening Torque, refer to Engine, Specifications, Mechanical.





Tighten down nuts (2) on exhaust side and nuts (3) on inlet side.
Tightening Torque, refer to Engine, Specifications, Mechanical.





Pull back special tool 11 2 300 until flywheel is no longer located in position.





Remove special tools 11 3 244 and 11 3 240.





Rotate engine twice in direction of rotation until cam tips on inlet and exhaust camshafts on 1st cylinder face one another.





Secure crankshaft in TDC position with special tool 11 2 300.

Caution:
^ Do not turn the engine back.
^ Remove special tool 11 2 300 before starting engine.





Apply special tool 11 3 240 on camshafts.





Note: Due to the rubberized chain wheel, tolerances, and running clearances in the splines, the special tool 11 3 240 can protrude up to 1 mm above the inlet side in spite of the camshafts being correctly set.

If the special tool 11 3 240 protrudes above the exhaust side, it will be necessary to readjust the timing.





Relieve tension on special tool 11 4 220 and remove.





Install cylinder for chain tensioning piston, refer to Engine, Timing Components, Timing Chain Tensioner, Service and repair.





Remove special tool 11 2 300 (setting mandrel).





Remove special too] 11 6 150. Install VANOS adjustment unit.
Assemble engine.