57. Timing Chain Housing Installation

^ Tool Required
- J 36008-A Camshaft Sprocket Alignment

Important: Ensure that the alignment pins are in the cylinder block and the timing chain housing, before installing the timing chain housing. The alignment pins ensure proper chain housing and front cover location for correct front oil seal-to-crankshaft alignment.

Important: Ensure that the timing chain housing to camshaft housing gaskets are properly oriented. If the gaskets are not properly oriented an oil leak will result.





1. Install the timing chain housing gaskets.
2. Install the timing chain housing. No sealer is needed.
3. Install the timing chain housing to the camshaft housing bolts and hand tighten.
4. Install the timing chain housing to the block fasteners and hand tighten.

Notice: Refer to Fastener Notice in Service Precautions.

5. Install the chain housing to the oil pan bolts and hand tighten.





6. Tighten the bolts.
^ Tighten the (M8 X 1.25 X 25) (1) to 26 Nm (19 ft. lbs.).
^ Tighten the (M10 X 1.25 X 55) (2) to 50 Nm (37 ft. lbs.).
^ Tighten the (M8 X 1.25 X 25) (3) to 29 Nm (21 ft. lbs.).





7. Install the camshaft sprockets. Sprockets are identical and interchangeable.
8. Clean the old sealer off of the bolt with a wire brush.
9. Clean the threaded hole in the camshaft with a nylon bristle brush.
10. Install the camshaft sprocket bolts and washers while holding the sprockets with J 36008-A.
^ Tighten the bolts to 70 Nm (52 ft. lbs.).
11. Use Adhesive/Sealant Compound GM P/N 12345493 or equivalent on the camshaft sprocket bolts.