Camshaft Timing Chains

Camshaft Timing Chains

Requirements:

• The engine is removed. Refer to => [ Engine, Removing ] Engine, Removing.

• The engine and electro-drive drive motor are separated. Refer to => [ Electro-Drive Drive Motor and Transmission, Separating from and Installing to Engine ] Electro-Drive Drive Motor and Transmission, Separating from and Installing to Engine.

Removing

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

- Remove the camshaft adjusters. Refer to => [ Camshaft Adjusters ] Service and Repair.

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

• Paint arrows to mark the left and right camshaft timing chain running direction so they can be reinstalled again. Do not mark the camshaft timing chain with a punch, notch or something similar.

- Remove the locking pin (T40071) and the left camshaft timing chain.






- Remove the bolts - 1 and 2 - and the right chain tensioner.






- Press the timing mechanism chain tensioner guide rail in the - direction of the arrow - and secure the chain tensioner using a locking pin (T40071).






- Remove the drive chain sprocket pin bolt - 1 -.

- Remove the drive chain sprocket and remove the right camshaft timing chain.

Installing

• For the correct tightening specifications, refer to => [ Camshaft Timing Chain Overview ] Camshaft Timing Chain Overview.

• If the tensioning element was removed from the chain tensioner, note the installed position: The hole in the housing floor faces toward the chain tensioner, the piston faces toward the tensioning rail.

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

Risk of damaging valves and piston crowns.

• If the camshafts are rotated, the crankshaft may not rest with any piston at Top Dead Center (TDC).

- Install the left camshaft timing chain on the drive chain sprocket according to the mark that was made earlier when it was removed and guide it upward toward the cylinder head.






- Press the guide rail for the left camshaft timing chain tensioner down and secure the chain tensioner using a locking pin (T40071).

- Install the right camshaft timing chain on the drive chain sprocket according to the mark that was made earlier when it was removed and guide it upward toward the cylinder head.






- Install the drive chain sprocket, refer to => [ Installed Position of the Pin for the Right Camshaft Timing Chain Drive Sprocket ] Timing Mechanism Drive Chain Overview.

- Tighten the drive chain sprocket pin bolt - 1 -.

- Remove the locking pin (T40071).

• Ignore the - arrow -.

- Install the chain tensioner to the right cylinder head.






- Tighten the bolts - 1 and 2 -.

Further installation is performed in reverse order of removal, noting the following:

- Install the camshaft adjusters, refer to the following:

=> [ Installing, Cylinder Bank 1 (Right Side) ] Service and Repair.

=> [ Installing, Cylinder Bank 2 (Left Side) ] Service and Repair.

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