Camshaft Timing Chains, Removing From Camshafts
Camshaft Timing Chains, Removing from Camshafts
Special tools, testers and auxiliary items required
• Crankshaft Holder (3242)
• Socket (T40058)
• Adjusting Pin (T40060) (quantity: 2)
• Adapter (T40061)
• Adapter (T40062)
• Two 3.3 mm drill bits
Removing
• Engine and transmission installed.
• If working on just one of the cylinder heads, it is not necessary to remove the timing chain cover on the opposite cylinder head.
- Remove the timing chain cover. Refer to => [ Left Timing Chain Cover ] Left Timing Chain Cover, => [ Right Timing Chain Cover ] Right Timing Chain Cover.
- Insert the (T40058) guide pins as follows:
• The large diameter - arrow 1 - faces the engine.
• Small diameter - arrow 2 - points to adapter.
Components could be destroyed by the camshaft timing chain jumping off.
• Turn crankshaft only in direction of engine rotation - arrow -.
- Use the (T40058) to rotate the crankshaft to "TDC".
• The (T40060) has a flat part - 2 - which makes it easier to insert if the camshaft and the cylinder head are slightly offset.
• Insert the pin so that the bolt - 1 - is perpendicular to the camshaft axle.
• Move the bolt - 1 - 90° - arrow - so that it is perpendicular to the camshaft axle and it is possible to attain the correct "TDC" position.
- Check whether camshafts of both cylinder heads stand in "TDC" position.
• It must be possible to secure the camshafts with the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 1 (right).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 2 (left).
• To collect escaping engine oil, place a clean cloth under the upper section of the oil pan.
- Remove the bolt - arrow - for the "TDC" marking from the upper section of the oil pan by using a long hex socket wrench with a ball head.
- Install the (3242) in the hole and tighten to 20 Nm. Turn the crankshaft - 1 - back and slightly to completely center the bolt, if necessary.
- To protect against cuts, wrap the point and the cutting edges on a 3.3 mm drill bit with insulating tape.
- Push the tensioning track of the chain tensioner for the left camshaft timing chain in direction of - arrow - and secure the chain tensioner with a 3.3 mm drill bit - 1 -.
The engine could be destroyed.
• To prevent small parts from accidentally entering the engine through the opening in the timing chain compartment, cover the opening with a clean cloth.
- Remove the bolt - 3 - and remove the tensioning rail.
- Remove the bolts - 1 - for the guide rail and bolts - 2 - for the camshaft chain sprocket.
- Remove the camshaft chain sprocket and guide rail.
- To protect against cuts, wrap the point and the cutting edges on a 3.3 mm drill bit with insulating tape.
- Push the chain tensioner guide rail for the right camshaft timing chain in direction of - arrow - and secure the chain tensioner with a 3.3 mm drill bit - 1 -.
The engine could be destroyed.
• To prevent small parts from accidentally entering the engine through the opening in the timing chain compartment, cover the opening with a clean cloth.
- Remove the chain tensioner bolts - 1 - and camshaft chain sprocket bolts - 3 - and - 2 -.
- Remove the camshaft chain sprocket and chain tensioner.
Installing
• For the correct tightening specifications, refer to => [ Camshaft Timing Chains Overview ] Camshaft Timing Chains Overview.
• Secure crankshaft - 1 - in Top Dead Center (TDC) position using (3242).
• Replace bolts which have been tightened to an additional torque.
Risk of damaging valves and piston crowns.
• If camshafts are rotated, crankshaft may not rest with any piston at TDC.
- Check whether camshafts of both cylinder heads stand in TDC position.
• It must be possible to secure the camshafts with the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 1 (right).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 2 (left).
- Remove the (T40060) from both camshafts.
Risk of damaging valves and piston crowns.
• If camshafts are rotated, crankshaft may not rest with any piston at TDC.
• If the camshafts are not secured, it is possible to correct them slightly with the (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 with the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft.
- Pull 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 with the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft.
- Pull the drill bit - 3 - out of the alignment hole, thereby releasing the right chain tensioner.
- Tighten the right camshaft chain sprocket using the (T40062) and torque wrench to 20 Nm in direction of - arrow - and hold.
- Fasten bolts - 1 and 2 -.
- Remove the (T40062) and (T40060).
- Tighten the remaining bolts for the right camshaft chain sprocket.
- Tighten the left camshaft chain sprocket using the (T40062) and torque wrench to 15 Nm in direction of - arrow - and hold.
- Fasten bolts - 1 - and - 2 -.
- Remove the (T40062) and (T40060).
- Tighten the remaining bolts for the left camshaft chain sprocket.
- Remove the (3242).
Checking the Valve Timing
Components could be destroyed by the camshaft timing chain jumping off.
• Turn crankshaft only in direction of engine rotation - arrow -.
- Turn the crankshaft two turns until the crankshaft is just in front of TDC.
- Lock the crankshaft - 1 - from turning using the (3242) to 20 Nm.
An inaccurate TDC setting will cause an inaccurate setting.
• If the crankshaft was turned past TDC: Turn the crankshaft again 2 turns until it is just in front of TDC, then lock it from moving with the (3242).
- Check whether camshafts of both cylinder heads stand in TDC position.
• It must be possible to secure the camshafts with the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 1 (right).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft on cylinder bank 2 (left).
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.
- Mount the (T40061) over the bolt heads.
- Turn the camshaft by the (T40061) just a little back and forth until it is possible to insert the (T40060).
• The bolt - arrow - in the (T40060) must be perpendicular to the center axle of the camshaft.
- Tighten the bolts for the camshaft chain sprocket with the (T40061) and the (T40060) still attached to approximately 5 Nm.
- Remove the (T40060) and (T40061).
- Tighten the camshaft chain sprocket bolts to final torque.
- 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:
- Tighten the bolt for the TDC marking in the upper section of the oil pan. Refer to => [ Upper Oil Pan Overview ] Upper Oil Pan Overview.
- Install the timing chain cover. Refer to => [ Left Timing Chain Cover ] Left Timing Chain Cover, => [ Right Timing Chain Cover ] Right Timing Chain Cover.