Camshaft Timing Chain

Camshaft Timing Chain

Removing

• Engine-transmission assembly removed and separated on the scissor lift table (VAS 6131 A). Refer to => [ Engine and Transmission, Separating ] Engine and Transmission, Separating.

• Engine oil drained.

- Remove drive plate. Refer to => [ Drive Plate ] Drive Plate.

- Remove the cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.

- Remove left and right timing chain covers. Refer to => [ Left and Right Timing Chain Covers ] Left and Right Timing Chain Covers.

- Remove the intake manifold.

- Remove oil filter housing. Refer to => [ Oil Filter Housing ] Oil Filter Housing.

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

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

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 camshaft timing chain with punch, notch or something similar.

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





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 camshaft timing chain with punch, notch or something similar.

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





Installing

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

• If the tensioning element is to be removed from the chain tensioner, observe the installed position: Hole in housing floor faces toward chain tensioner, piston faces toward tensioning rail.

• Replace bolts which have been tightened to torque.

• Replace the gasket.

Risk of damaging valves and piston crowns.

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

- Press left and right camshaft timing chain guide rail inward - arrow - as far as stop and secure chain tensioner with (T40071).





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





- Place a new gasket - 3 - onto the rear of the chain tensioner - 1 -.

- Insert chain tensioner in left cylinder head and position camshaft timing chain according to mark applied during removal, as shown in illustration.

- Tighten bolts - 1 - and - 2 -.





- Insert chain tensioner in right cylinder head and position camshaft timing chain according to mark applied during removal, as shown in illustration.





- Tighten bolts - 1 - and - 2 -.

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

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

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

- Install oil filter housing. Refer to => [ Oil Filter Housing ] Oil Filter Housing.

- Install intake manifold.

- Install left and right timing chain covers => [ Installing ] Left and Right Timing Chain Covers.

- Install cylinder head cover. Refer to => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, right => [ Right Cylinder Head Cover ] Right Cylinder Head Cover.

- Install drive plate. Refer to => [ Drive Plate ] Drive Plate.