Intake Camshaft and Lifter Replacement

Intake Camshaft and Lifter Replacement
^ Tools Required
- J 43655 Camshaft Sprocket Holding Tool

Removal Procedure
1. Remove the camshaft cover.





2. Remove the upper timing chain guide.





3. Install the J 43655.





4. Remove both the intake and exhaust camshaft sprocket bolts and discard.
5. Slide the camshaft sprockets forward.





6. Mark the caps to ensure they are installed in the original position.

7. Important: Remove each bolt on each cap one turn at a time until there is no spring tension on the camshaft.

Remove the caps.
8. Remove the camshaft.





9. Remove the camshaft roller followers.





10. Remove the hydraulic lash adjusters.

Installation Procedure





1. Lubricate the valve tips.





2. Install the hydraulic lash adjusters.





3. Install the camshaft roller followers.





4. Ensure that the alignment notches are aligned with the camshaft sprocket.





5. Install the camshaft.
6. Install the caps.

7. Notice: Refer to Fastener Notice in Service Precautions.

Tighten the camshaft bearing cap bolts in increments of 3 turns until they are seated.
^ Tighten the camshaft bearing cap bolts to 10 Nm (89 inch lbs.).





8. Apply a 3.5 mm (0.138 inch) bead of GM P/N 12378521 (Canadian P/N 88901148) to the rear cap.
9. Install the rear intake camshaft bearing cap bolts.
^ Tighten the bolts to 25 Nm (18 ft. lbs.).
10. Install camshaft sprockets onto the camshafts.
11. Hand tighten NEW camshaft sprocket bolts.
12. Remove the J 43655.





13. Tighten the camshaft sprocket bolts.
^ Tighten the bolts to 85 Nm (63 ft. lbs.) plus 30 degrees.





14. Install the upper timing chain guide.
^ Tighten the upper timing chain guide to 10 Nm (89 inch lbs.).
15. Install the camshaft cover.