Camshaft Timing Chains

Camshaft Timing Chains

Special tools, testers and auxiliary items required

• Locking Pin (T40071)

Removing

• Engine remove, transmission separated from the engine. Refer to => [ Engine and Transmission, Separating ] Engine and Transmission, Separating.

• Secure the engine to the scissor lift platform (VAS 6131 A) or to an engine/transmission holder. Refer to => [ Engine, Securing to Engine and Transmission Holder ] Engine, Securing to Engine and Transmission Holder.

- Remove timing chain lower cover. Refer to => [ Lower Timing Chain Cover ] Lower Timing Chain Cover.

- Remove the camshaft timing chains from the camshafts. Refer to => [ Camshaft Timing Chains, Removing from Camshafts ] Camshaft Timing Chains, Removing From Camshafts.

CAUTION!
If the running direction is reversed on a used camshaft timing chain, it could be destroyed.

• Paint arrows to mark the timing chain running direction so it can be installed again. Do not mark the camshaft timing chain with a punch, notch or something similar.

Left Camshaft Timing Chain:

- Remove bolts - 1 - and - 2 - and remove the left chain tension and left camshaft timing chain.





Right Camshaft Timing Chain:

- Push the chain tensioner guide rail for the camshaft timing chain in direction of - arrow - and secure the chain tensioner (T40071).





- Loosen the bolt - 1 - for the camshaft timing chain drive sprocket just 11/2 turns but do not remove the bolt.

- Remove bolts - 1 - and - 2 - and remove the right chain tension and right camshaft timing chain.





Installing

• Tightening specifications, refer to => [ Camshaft Timing Chains Assembly Overview ] Camshaft Timing Chains Assembly Overview.

• If the tensioner was removed from the chain tensioner, then pay close attention to the installed position: the hole in the bottom of the housing faces the chain tensioner and the piston faces the tensioning rail.

• Replace bolts which have been tightened to an additional torque.

• Replace the chain tensioner seals.

CAUTION!
Risk of damaging valves and piston crowns.

• If camshafts are rotated, crankshaft may not rest with any piston at TDC.

- Press the guide rails for the left and right camshaft timing chain tensioner in - arrow - as far as the stop and secure the chain tensioner with a (T40071).





- Clean the oil strainer - 2 - in both chain tensioners if necessary.





• Pay close attention when installing the oil screen on the groove in the chain tensioner.

- Mount and attach the rear seal - 3 - onto the chain tensioner - 1 -.

Left Camshaft Timing Chain:

- Position the left camshaft timing chain according to the markings made during removal as shown in the illustration.

- Fasten bolts - 1 - and - 2 -.





Right Camshaft Timing Chain:

- Insert the chain tensioner on the right cylinder head and position the camshaft timing chain according to the markings made during removal, as shown in the illustration.

- Fasten bolts - 1 - and - 2 -.





- Tighten the bolt - 1 - for the right camshaft timing chain drive sprocket.





Continued for Both Sides:

- Remove the (T40071).

The rest of the installation is in reverse order of removal, note the following:

- Position the camshaft timing chain on the camshafts => [ Installing ] Camshaft Timing Chains, Removing From Camshafts.

- Install timing chain lower cover. Refer to => [ Lower Timing Chain Cover ] Lower Timing Chain Cover.