Variable Valve Timing Actuator: Service and Repair

Exhaust Camshaft Position Actuator Replacement

^ Tools Required
- J 36660-A Torque Angle Meter
- J 44217 Timing Chain Retention Tool

Removal Procedure
1. Remove the camshaft cover.
2. Rotate the engine until the word Delphi on the exhaust camshaft position actuator is lined up parallel with the cylinder head to cam cover mating surface.





3. Remove the top chain guide bolts.
4. Remove the top chain guide.
5. Using the timing mark on the exhaust camshaft position actuator sprocket as a reference, make a mark on the timing chain link across from it.





6. Install the J-44217 (1).
1. Install the hook portion of the timing chain retention tools into one of the timing chain links near the timing chain shoe on both sides of the engine.
2. Tighten the wingnuts.
3. Ensure the hooks are still in one of the links and the gage blocks of the tool are firmly in place on the edge of the head.





7. Remove the exhaust camshaft position actuator bolt.
8. Remove the exhaust camshaft position actuator.

Installation Procedure





1. Install the exhaust camshaft actuator into the timing chain.
2. Align the marked link of the timing chain with the timing mark on the exhaust camshaft position actuator sprocket (1).

3. Install the exhaust camshaft actuator onto the exhaust camshaft.

Important: Ensure the alignment pin is engaged between the camshaft and the exhaust camshaft position actuator.






4. Install the exhaust camshaft actuator bolt.
^ Tighten the exhaust camshaft actuator bolt the first pass to 25 Nm (18 lb ft).
^ Use the J 36660-A to tighten the exhaust camshaft actuator bolt the final pass an additional 135 degrees.

Notice: The camshaft actuator must be fully advanced during installation. Engine damage may occur if the camshaft actuator is not fully advanced. Refer to Fastener Notice in Service Precautions.

Important: Ensure the camshaft actuator is rotated clockwise relative to the camshaft prior to tightening the bolt. Do not force the camshaft actuator to rotate clockwise. If it does not move easily, it is already fully advanced. New camshaft actuators are already packaged in the fully advanced (clockwise) position.

5. Remove the J-44217.





6. Install the top chain guide.
7. Add threadlocker GM P/N 12345493 (Canadian P/N 10953488) to the top chain guide bolt threads.
8. Install the top chain guide bolts.
Tighten the top chain guide bolts to 10 Nm (89 lb in).
9. Install the camshaft cover.