11 31 051 Replacing timing chain (M62 VANOS from 9/98): Removal

WARNING: This page is about a different car, the 2003 BMW X5, 2002 BMW X5, 2001 BMW X5, and 2000 BMW X5. However, it is still accessible from the selected car via links, so may be relevant.

Removal of timing chain is described separately from installation. Assembly sequence for removal and installation is different.

Remove spark plugs. See 12 12 011 REPLACING ALL SPARK PLUGS

Remove both cylinder head covers.

NOTE: In firing TDC position, the inlet camshaft 1 to 4 rotates in the teeth of the camshaft adjustment unit.

CAUTION: This twisting is caused by the position of the cams and is not an indication for incorrect timing.

Fig 1: Identifying Camshaft Rotating Position

Courtesy of BMW OF NORTH AMERICA, INC.

Remove oil lines on left and right of cylinder head.

Fig 2: Removing Oil Lines On Left And Right Of Cylinder Head

Courtesy of BMW OF NORTH AMERICA, INC.

Remove vibration damper.

Slacken central screw of hub for vibration damper. This task is described in the section "Removing and installing hub for vibration damper".

Rotate engine at slackened central bolt in direction of rotation until the first cylinder is in TDC firing position.

Fig 3: Identifying Direction Of Rotation Of Cam

Courtesy of BMW OF NORTH AMERICA, INC.

NOTE: When the first cylinder is in TDC firing position, the camshaft markings face upwards.

Fig 4: Identifying Camshaft Markings Face Upwards

Courtesy of BMW OF NORTH AMERICA, INC.