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.