Removing and Installing Guide Rail In Cylinder Head

Preceding work:
- Cylinder head cover removed




- Remove chain tensioner (1).
- Rotate exhaust camshaft in direction of rotation of camshaft, slacken timing chain at guide rail (42).



- With wrench (25) 119 589 00 01 00 (WAF 27) or



- With wrench 104 589 01 01 00 (WAF 29).

WARNING If the curved guide rail (42) is taken out of its mounting, the thrust pin in the chain tensioner is moved in the pressure direction by one detent. The chain tensioner must then be removed to avoid the timing chain being over- tensioned.

- Pull off guide rail (42) at bearing pin.

A First Version, B Second Version:

- Guide rail with three bearing points replaces guide rail with two bearing points. Standardization with engines 104.942/992.

- Turn exhaust camshaft back with wrench (25) in opposite direction of rotation of camshaft.
- Install chain tensioner (1).