Camshaft Timing Chains, Removing from Camshafts
Camshaft Timing Chains, Removing from Camshafts
Special tools, testers and auxiliary items required
• Crankshaft Holder (3242)
• Socket (T40058)
• Adjustment Pin (T40060) (Quantity: 2)
• Adapter (T40061)
• Adapter (T40062)
• 3.3 mm Diameter Drill Bit (Quantity: 2)
Removing
• Engine and transmission installed.
• If work will only be done on one cylinder head, it is only necessary to adjust the valve timing on the cylinder bank that was repaired.
- Drain the coolant. Refer to => [ Draining and Filling ] Draining and Filling.
- Remove the primary catalytic converter. Refer to => [ Exhaust System Components ] Exhaust System Components.
- Remove the vacuum pump. Refer to => [ Vacuum Pump Overview ] Description and Operation.
- Remove the rear right coolant pipe. Refer to => [ Rear Coolant Pipe ] Rear Coolant Pipe.
- Remove the left rear coolant pipe. Refer to => [ Left Rear Coolant Pipe ] Left Rear Coolant Pipe.
• The following illustrations shows the steps on the drive chains from behind with the engine removed.
- Remove bolts - 1 through 4 - and remove the left timing chain cover.
- Remove the bolts - 1 through 4 - and remove the right timing chain cover.
- Insert the (T40058) guide pin as follows:
• The large diameter - arrow 1 - faces the engine.
• The small diameter - arrow 2 - points to the adapter.
CAUTION!
Components could be destroyed by the camshaft timing chain jump off.
• Turn the crankshaft only in engine rotation direction - arrow -.
- Using (T40058), rotate the crankshaft to Top Dead Center (TDC).
• 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 TDC position.
- Check whether the camshafts for both cylinder heads are in 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.
• To collect any leaking engine oil, place a clean cloth under the upper oil pan.
- Remove the plug - arrow - from the upper oil pan.
CAUTION!
Risk of injury when inserting your finger in the TDC hole.
• Do not rotate the 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!
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 the 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 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!
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 - 2 and 3 -.
- Remove the camshaft chain sprocket and chain tensioner.
Installing
• Tightening specifications, refer to => [ Left Camshaft Timing Chain Overview ] Left Camshaft Timing Chain Overview.
• Secure the crankshaft - 1 - in TDC position using (3242).
• Replace bolts which have been tightened to an angle specification.
• Replace the plug in the upper oil pan.
CAUTION!
Risk of damaging valves and piston crowns.
• If the camshafts are rotated, crankshaft may not rest with any piston at TDC.
- Check whether the camshafts for both cylinder heads are in 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 the 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 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 - 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 and tighten 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.
- Pre-tighten the left camshaft chain sprocket using (T40062) and a torque wrench and tighten 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 the crankshaft only in engine rotation direction - arrow -.
- Turn the crankshaft two turns until the crankshaft 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.
• 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.
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 by the (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 - to the upper oil pan.
- Install the timing chain covers. Refer to => [ Timing Chain Covers ] Service and Repair.