Camshaft Timing Chains

Camshaft Timing Chains

Special tools, testers and auxiliary items required

• Crankshaft Holder (3242)

• Key (T40049)

• Adjustment Pin (T40060) (Quantity: 2)

• Adapter (T40061)

• Adapter (T40062)

• 3.3 mm Diameter Drill Bit (Quantity: 2)

Removing

• Transmission removed.

CAUTION!
Risk of damaging valves and piston crowns.

• Turn the crankshaft and camshafts only with the chain drive completely installed.

- Remove the drive plate. Refer to => [ Drive Plate ] Service and Repair.

- Remove the timing chain covers. Refer to => [ Timing Chain Covers ] Service and Repair.

- Install the (T40049) at the rear of the crankshaft using two used drive plate bolts - arrows -.

• The (T40060) has a flat part - 2 - which makes it easier to insert if the camshaft and the cylinder head are slightly offset.

• Install the (T40060) so that the pin - 1 - is perpendicular to the camshaft axis.

• Rotate the (T40060) using the pin - 1 - 90° - arrow - so that it is perpendicular to the camshaft axis and it is possible to attain the correct Top Dead Center (TDC) position.

CAUTION!
Components could be destroyed by the camshaft timing chain jump off.

• Only rotate the crankshaft in engine rotation direction.

- Rotate the crankshaft to TDC:

• It must be possible to secure the camshafts using (T40060).

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the cylinder bank 1 (right) camshaft.

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the cylinder bank 2 (left) camshaft.

- Remove the plug - arrow - from the upper oil pan.

CAUTION!
Risk of injury when inserting your finger in the TDC hole.

• Do not rotate crankshaft - 1 -.

- Install the (3242) into the hole and tighten it to 20 Nm. Rotate the crankshaft back and forth slightly to center the (3242) completely, if necessary.

- To protect against cuts, wrap the point and the cutting edges of a 3.3 mm diameter drill bit with insulating tape.

- Push the chain tensioner tensioning rail for the left camshaft timing chain in the - direction of the arrow - and secure the chain tensioner using the 3.3 mm diameter drill bit - 1 -.

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.

- Remove the (T40060) from both camshafts.

- Remove the bolt - 3 - and remove the tensioning rail.

- Remove the bolts- 1 - for the guide rail and the bolts - 2 - for the camshaft chain sprocket.

- Remove the camshaft chain sprocket, guide rail and left camshaft timing chain.

- To protect against cuts, wrap the point and the cutting edges of a 3.3 mm diameter drill bit with insulating tape.

- Push the chain tensioner guide rail for the right camshaft timing chain in the - direction of the arrow - and secure the chain tensioner using the 3.3 mm diameter drill bit - 1 -.

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.

- Remove the chain tensioner bolts - 1 - and camshaft chain sprocket bolts - 2 and 3 -.

- Remove the camshaft chain sprocket, chain tensioning and right camshaft timing chain.

Installing

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

• Secure the crankshaft - 1 - in TDC position using (3242).

• Install the balance shaft and oil pump chain. Refer to => [ Balance Shaft and Oil Pump Chain ] Balance Shaft and Oil Pump Chain.

• Replace the plug in the upper oil pan for the TDC mark.

• Replace bolts which have been tightened to a angle specification.

CAUTION!
Risk of damaging valves and piston crowns.

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

- Check whether the camshafts for both cylinder heads are in the TDC position.

• It must be possible to secure the camshafts using (T40060).

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the cylinder bank 1 (right) camshaft.

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the cylinder bank 2 (left) camshaft.

- Remove the (T40060) from both camshafts.

CAUTION!
Risk of damaging valves and piston crowns.

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

• If the camshafts are not secured, it is possible to correct them slightly using (T40061) by installing the camshaft chain sprocket on the camshaft.

- Install the left camshaft timing chain with the camshaft chain sprocket, the guide rail and the tensioning rail.

• The slots in the camshaft chain sprocket must be at the middle position in relation to the threaded holes in the camshaft.

- Tighten the bolts - 1 and 3 - for the guide rail and the tensioning rail.

- Install both camshaft chain sprocket bolts - 2 - loosely.

• It must still be possible to rotate the camshaft chain sprocket on the camshaft and it must not tip.

- Secure the left camshaft using (T40060).

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the camshaft.

- Remove the drill bit - 4 - out of the alignment hole, thereby releasing the chain tensioner.

- Install the right camshaft timing chain with the chain sprocket and chain tensioner.

• The slots in the camshaft chain sprocket must be at the middle position in relation to the threaded holes in the camshaft.

- Tighten the chain tensioner bolts - 1 -.

- Install both camshaft chain sprocket bolts - 2 - loosely.

• It must still be possible to rotate the camshaft chain sprocket on the camshaft and it must not tip.

- Secure the right camshaft using (T40060).

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the camshaft.

- Remove the drill bit - 3 - out of the alignment hole, thereby releasing the right chain tensioner.

- Pre-tighten the right camshaft chain sprocket using (T40062) and a torque wrench to 20 Nm in the - direction of the arrow - and hold it.

- Tighten the bolts - 1 and 2 -.

- Remove the (T40062) and (T40060).

- Install and tighten the remaining bolts for the right camshaft chain sprocket.

- Tighten the left camshaft chain sprocket using (T40062) and a torque wrench to 15 Nm in the - direction of the arrow - and hold it.

- Tighten the bolts - 1 and 2 -.

- Remove the (T40062) and (T40060).

- Install and tighten the remaining bolts for the left camshaft chain sprocket.

- Remove the (3242).

Checking the Valve Timing

CAUTION!
Components could be destroyed by the camshaft timing chain jump off.

• Turn crankshaft only in direction of engine rotation - arrow -.

- Turn the crankshaft 2 turns using (T40049) until it is just in front of TDC.

- Lock the crankshaft - 1 - from turning using (3242) and tighten it to 20 Nm.

CAUTION!
An inaccurate TDC setting will cause an inaccurate setting.

• If the crankshaft was only rotated slightly past TDC, first rotate it back approximately 10° and then rotate it in engine rotation direction again to TDC.

- Check whether the camshafts for both cylinder heads are in TDC position.

Correcting the Valve Timing

- If one of the camshafts does not lock, loosen all the bolts - arrows - for that particular camshaft chain sprocket about 1 turn.

- Install the (T40061) over the bolt heads.

- Turn the camshaft using (T40061) just a little back and forth until it is possible to install the (T40060).

• The pin - arrow - on (T40060) must be perpendicular to the center axis of the camshaft.

- Tighten the bolts for the camshaft chain sprocket using (T40061) with the (T40060) still attached to approximately 5 Nm.

- Remove the (T40060) and (T40061).

- Tighten the camshaft chain sprocket bolts to the final specification.

- Repeat the procedure on the other cylinder bank if necessary.

- Remove the (3242).

- Check the valve timing once again.

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

- Install the plug - arrow - in the upper oil pan.

- Install the timing chain covers. Refer to => [ Timing Chain Covers ] Service and Repair.

- Install the drive plate. Refer to => [ Drive Plate ] Service and Repair.

- Fill the engine oil and check the oil level.