Camshaft Timing Chain

Camshaft Timing Chain

Special tools, testers and auxiliary items required

• Crankshaft Holder (3242)

• Key (T40049)

• Adjustment Pin (T40060) (Qty: 2)

• Adapter (T40061)

• Adapter (T40062)

• Two 3.3 mm Drill Bits

Requirement

• Transmission is removed.

Removing

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 ] Drive Plate.

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

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

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

• Insert the pin so that the lever - 1 - is perpendicular to the camshaft axis.

• Move the lever - 1 - 90° (1/4) turn - arrow - so that it is perpendicular to the camshaft axis and it is possible to attain the correct Top Dead Center (TDC) position.

Components could be destroyed by the camshaft timing chain jumping off.

• Only rotate the crankshaft in engine rotation direction.

- Rotate the crankshaft to TDC:

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

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

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

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

Risk of injury when touching the TDC hole with finger.

• Do not rotate the crankshaft - 1 -.

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

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

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

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 adjustment pin (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 sprocket.

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

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

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

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 the camshaft sprocket bolts - 2 and 3 -.

- Remove the camshaft sprocket, chain tensioner 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 the TDC position using the crankshaft holder (3242).

• The balance shaft and oil pump drive chain is installed. Refer to => [ Balance Shaft and Oil Pump Chain ] Balance Shaft and Oil Pump Chain.

• Replace the TDC plug seal.

• Replace any bolts that were 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 TDC.

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

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

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

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

- Remove the adjustment pin (T40060) from both camshafts.

Risk of damaging valves and piston crowns.

• If the 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 the adapter (T40061) by installing the camshaft sprocket on the camshaft.

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

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

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

- Install two camshaft sprocket bolts - 2 - loosely.

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

- Secure the left camshaft using the adjustment pin (T40060).

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

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

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

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

- Tighten the chain tensioner bolts - 1 -.

- Install two camshaft sprocket bolts - 2 - loosely.

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

- Secure the right camshaft using the adjustment pin (T40060).

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

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

- Install the right camshaft sprocket using the adapter (T40062) and a torque wrench.

- Tighten the bolts - 1 and 2 - to 20 Nm in the - direction of the arrow - and hold.

- Remove the adapter (T40062) and the adjustment pin (T40060).

- Tighten the remaining bolts for the right camshaft sprocket.

- Install the left camshaft sprocket using the adapter (T40062) and torque wrench.

- Tighten bolts - 1 and 2 - to 15 Nm in the - direction of the arrow - and hold.

- Remove the adapter (T40062) and adjustment pin (T40060).

- Tighten the remaining bolts for the left camshaft sprocket.

- Remove the crankshaft holder (3242).

Checking the Valve Timing

Components could be destroyed by the camshaft timing chain jumping off.

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

- Rotate the crankshaft 2 revolutions using the key (T40049) until it is just in front of TDC.

- Secure the crankshaft - 1 - from turning using the crankshaft holder (3242) , tighten it to 20 Nm.

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 the TDC position.

Correcting the Valve Timing

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

- Install the adapter (T40061) over the bolt heads.

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

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

- Tighten the bolts for the camshaft sprocket with the adapter (T40061) and the adjustment pin (T40060) still installed to approximately 5 Nm.

- Remove the adjustment pin (T40060) and the adapter (T40061).

- Tighten the camshaft sprocket bolts to their final torque.

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

- Remove the crankshaft holder (3242).

- Check the valve timing once again.

Further installation is in the reverse order of removal. Note the following:

- Install the plug - arrow - for the TDC mark in the upper oil pan. Refer to => [ Upper Oil Pan Overview ] Upper Oil Pan Overview.

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

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

- Fill the oil and then check the level.