Removing and Installing/Replacing Inlet and Exhaust Adjustment Units

11 36 046 Removing And Installing Or Replacing Intake And Exhaust Camshaft Adjustment Units (N55)

Special tools required:







Necessary preliminary work:
- Remove cylinder head cover
- Check timing







IMPORTANT:
Only use special tool 11 4 280 to loosen central bolts (1 and 2) of Vanos unit.
Modify special tool 11 4 280 for N55 engine.

Release central bolts (1 and 2).







Release chain tensioner (1).
Tightening torque 11 31 6AZ.

IMPORTANT:
Have a cleaning cloth ready. A small quantity of engine oil will emerge after the screw connection has been released.
Make sure no engine oil runs onto belt drive.

Installation:
Replace sealing ring.







Slightly lift timing chain (1) and remove exhaust camshaft adjuster (2) from exhaust camshaft.
Slightly tilt exhaust camshaft adjuster (2) and remove upward.







Slightly lift timing chain (1) and remove intake adjuster (2) from intake camshaft.
Slightly tilt intake adjuster (2) and remove upward.







IMPORTANT:
Risk of mixing up the intake and exhaust camshaft adjusters.
Danger of engine damage.







Intake and exhaust adjustment units are different.
VANOS is marked with EX for the exhaust camshaft.
VANOS is marked with IN for the intake camshaft.
Camshaft sensor wheels can be fitted alternatively.







Installation:
Replace central bolts.

Place intake adjuster onto intake camshaft.
Place exhaust camshaft adjuster onto exhaust camshaft.
Installation position of intake and exhaust camshaft adjusters can be freely selected.
Insert central bolts (1) until stop.
Release central bolts (1) again by a 90° turn.







IMPORTANT: Incorrect installation possible.

Press tensioning rail (1) by hand against guide rail and make sure timing chain is guided in tensioning rail (1).

NOTE: Schematic representation of removed timing chain module.







Turn camshaft sensor wheels (2) in direction of arrow until retaining pins (1) 11 4 290 on special tool match up.
11 4 290 Slide on special tool in direction of arrow.







Special tool 11 4 280 must be mounted for fastening central bolts
Use bolts to fasten special tool 11 4 290.
11 9 340Screw special tool into cylinder head.







Pretension timing chain with special tool 11 9 340, 00 9 2500, 6 Nm







Use special tool 00 9 120 to tighten central bolts of intake adjuster.
Tightening torque 11 36 1AZ.







Use special tool 00 9 120 to tighten central bolts of exhaust camshaft adjuster.
Tightening torque 11 36 1AZ.







Remove all special tools.
Rev engine on the central bolt twice in the engine's direction of rotation and verify timing.
Assemble engine.