Timing Chain: Service and Repair

Timing Chain and Sprocket Replacement

Tools Required
* J 44221 Camshaft Holding Tool
* J 45059 Angle Meter

Removal Procedure

1. Remove #1 cylinder spark plug. Refer to Spark Plug Replacement (Service and Repair).
2. Remove the camshaft cover. Refer to Camshaft Cover Replacement (Service and Repair).
3. Remove the exhaust camshaft position (CMP) sensor. Refer to Camshaft Position Sensor Replacement - Exhaust (Service and Repair).
4. Remove the intake CMP sensor. Refer to Camshaft Position Sensor Replacement - Intake (Service and Repair).
5. Remove the engine front cover. Refer to Engine Front Cover Replacement (Service and Repair).
6. Rotate the crankshaft in the engine rotational direction clockwise, until the #1 piston is at top dead center (TDC) on the compression stroke.




Caution: Refer to Camshaft Holding Tool Caution (Camshaft Holding Tool Caution).
7. Install the J 44221 to the rear of the camshafts.




8. Release the tension on the timing chain by moving the tensioner shoe in.




9. Place the tee into the tensioner to hold the shoe in place.




10. Remove and discard the exhaust camshaft position actuator bolt.
11. Remove the exhaust camshaft position actuator.




12. Remove and discard the intake camshaft sprocket bolt.
13. Remove the intake camshaft sprocket.
14. Remove the timing chain.
15. Remove the crankshaft sprocket.

Installation Procedure





Important: Ensure the #1 piston is at TDC. The pin on the crankshaft for the timing chain sprocket should be straight up.


1. Install the crankshaft sprocket to the crankshaft snout.

Important: Every 7th link of the timing chain is darkened to aid in aligning the timing marks.


2. Install the intake camshaft sprocket into the timing chain.
Aligning the dark link (1) of the timing chain with the timing mark on the intake camshaft sprocket.
3. Feed the timing chain down through the opening in the cylinder head.
4. Install the timing chain on the crankshaft sprocket.
Align the dark link (2) of the timing chain with the timing mark on to the crankshaft sprocket.

Important: Ensure the alignment pin is properly engaged with the camshaft


5. Install the intake camshaft sprocket onto the intake camshaft.





Notice: Refer to Fastener Notice (Fastener Notice).

6. Install the new intake camshaft sprocket bolt.

Tighten the bolt to 20 N.m (15 lb ft) plus an additional 100 degrees using the J 45059 .

7. Ensure the camshaft actuator is fully advanced prior to installation. Refer to Camshaft Position Actuator Diagnosis (Component Tests and General Diagnostics).




8. Install the exhaust camshaft actuator into the timing chain.
Aligning the dark link (1) of the timing chain with the timing mark (1) on the exhaust camshaft position actuator sprocket.

Important:
* To aid in aligning the actuator to the camshaft, use a 25 mm (1 in) wrench on the hex of the camshaft to rotate

* Ensure the alignment pin is properly engaged with the camshaft


9. Install the exhaust camshaft actuator onto the exhaust camshaft.




10. Install the new exhaust camshaft actuator bolt.

Tighten the bolt to 25 N.m (18 lb ft) plus an additional 135 degrees using the J 45059 .




11. Remove the tee in the timing chain tensioner to regain tension on the timing chain.




12. Remove the J 44221 from the camshafts.




13. The dark links (1) on the timing chain should be aligned with the marks on the sprockets as shown.
14. Install the engine front cover. Refer to Engine Front Cover Replacement (Service and Repair).
15. Install the intake CMP sensor. Refer to Camshaft Position Sensor Replacement - Intake (Service and Repair).
16. Install the exhaust CMP sensor. Refer to Camshaft Position Sensor Replacement - Exhaust (Service and Repair).
17. Install the camshaft cover. Refer to Camshaft Cover Replacement (Service and Repair).
18. Install #1 cylinder spark plug. Refer to Spark Plug Replacement (Service and Repair).