Camshaft: Testing and Inspection

11 31 005 Checking Camshaft Timing (N55)

Special tools required:







IMPORTANT:
For the positioning of the special tool 11 4 281 on the mounting flats of the intake camshaft, a collision with the cylinder throttle return spring 1 can occur.
Special tool 11 4 281 reconditions at following description.







Check for freedom of movement of throttle return spring at intermediate lever cylinder 1.
Recondition special tool 11 4 281.
Rework chamfer on special tool 11 4 281 as shown in the range of 50 millimeters long and 8.5 millimeters wide.







Recondition chamfer on special tool 11 4 281 to 8.5 millimeters (see picture).







Necessary preliminary tasks:
- Remove cylinder head cover.
- Remove underbody protection.







Remove fastener (1) in direction of arrow.

Installation note:
Install fastener (1) with bore facing outwards.







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: 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.







NOTE: Vehicles with automatic transmission can only be secured to the specified position on flywheel (1) (see arrow).







With 1st cylinder in TDC firing position, cams of intake camshaft (1) point upward at an angle.







With 1st cylinder in TDC firing position, cams of the exhaust camshaft (1) point upwards at an angle.







The timings are correct when the part numbers or read code (1) and the intake and exhaust camshafts point upwards.







Secure special tool 11 4 285 with bolts (1) to cylinder head.

NOTE: Fit special tool 11 4 282 underneath on side of intake camshaft.

Mount reworked special tool 11 4 281 on the intake camshaft.
Mount special tool 11 4 281 on the exhaust camshaft.







If necessary, adjust valve timing.
Assemble engine.