Tools Required

J 35268-A Camshaft/Front Main Seal Installer

Important: 

•	The intake is marked with green paint between bearings 2 & 3 and has a code A cast into it near the number one bearing surface.

•	The exhaust is marked with gray paint between bearings 2 & 3 and has a code E cast into it near the number one bearing surface.




1. Install the camshafts to the cylinder head:

1.1.	Ensure the sprocket pin on the LH exhaust camshaft is approximately in the 12 o'clock position.

1.2.	Ensure the sprocket pin on the LH intake camshaft is approximately in the 7 o'clock position.





Important: DO NOT allow the sealer to get into the oil journal of the cap.

2. Apply a small amount of Loctite® 518, or equivalent, on the forward edge of the front bearing caps ONLY to ensure an adequate seal between the bearing cap and the cylinder head.



3. Install the bearing caps for the LH side cylinder head.

The bearing caps for the LH side are marked with an R1, R2, R3, etc. followed by a number

4. Install the camshaft bearing cap bolts.

Tighten
Tighten the camshaft bearing cap bolts evenly, starting from the center cap moving outward to 8 N·m (71 lb in).

5. Coat the lip of the camshaft seal with a small amount of GM P/N 12377985, chassis grease or equivalent, to aid in installation.
6. Use the J 35268-A to tap the camshaft seal into place.

Ensure the camshaft seal is fully and evenly seated.