Camshaft Timing Chain
Camshaft Timing Chain
Special tools, testers and auxiliary items required
• Old Oil Collecting and Extracting Device (V.A.G 1782)
Removing
• Even if work is performed only on one of the cylinder heads, the procedure described must be followed, since then the valve timing at both cylinder heads must be adjusted.
- Remove rear noise insulation by loosening fasteners - 1 and 2 -.
• Ignore items - 3 and 4 -.
- Place Old Oil Collecting and Extracting Device (V.A.G 1782) under engine and drain engine oil.
- Remove automatic transmission.
- Remove drive plate. Refer to => [ Drive Plate ] Drive Plate.
- Remove cylinder head cover. Refer to: Left => [ Left Cylinder Head Cover ] Left Cylinder Head Cover, right => [ 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 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 ] Camshaft Timing Chains.
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 camshaft timing chain with punch, notch or something similar.
- Remove bolts - 1 and 2 - and remove left chain tensioner and left camshaft timing chain.
- Identify running direction of right camshaft timing chain with paint for reinstallation.
- 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 was removed from the chain tensioner, note installation 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.
CAUTION!
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 Locking Pin (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.
- Install lower timing chain cover. Refer to => [ Lower Timing Chain Cover ] Lower Timing Chain Cover.
- Install crankshaft seal, transmission side. Refer to => [ Transmission-Side Crankshaft Sealing Ring, Replacing ] Service and Repair.
- Install oil filter housing. Refer to => [ Oil Filter Housing ] Oil Filter Housing.
- Install intake manifold.
- Install left and right timing chain covers => [ ] Left and Right Timing Chain Covers.
- Install cylinder head cover. Refer to: Left => [ 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.
- Install automatic transmission.
- Add engine oil and check oil level. Refer to => [ Oil Level, Checking ] Component Tests and General Diagnostics.