Installation
TOOL REQUIRED^ J 38122 Crankshaft Balancer Holder
1. Prior to installing the timing chain housing, ensure that the alignment dowel pins are in the cylinder block and the timing chain housing. The dowel pins ensure proper chain housing and the front cover location for correct front oil seal-to-crankshaft alignment.
2. Install the timing chain housing and the new gaskets. Gasket sealer is unnecessary.
NOTE: Hand tighten all chain housing bolts before tightening to specifications.
3. Install the chain housing to the camshaft housing bolts and hand tighten.
4. Raise and support the vehicle.
5. Install the timing chain housing block fasteners and hand tighten.
6. Install the oil pan to the timing chain housing bolts and hand tighten.
7. Tighten the timing chain housing block fasteners.
^ (1) (M8 X 1.25 X 25) 26 Nm (19 ft. lbs.).
^ (2) (M8 X 1.55 X 55) 50 Nm (37 ft. lbs.).
^ (3) (M10 X 1.25 X 35) 29 Nm (21 ft. lbs.).
8. Tighten the oil pan to the timing chain housing bolts.
^ (1) (M8 X 1.25 X 80) 24 Nm (18 ft. lbs.).
^ (2) (M8 X 1.24 X 22) 24 Nm (18 ft. lbs.).
^ (3) (M6 X 1.00 X 25) 12 Nm (106 ft. lbs.).
^ (4) 26 Nm (19 ft. lbs.).
9. Install the lowest front cover retaining stud into the timing chain housing.
10. Install the coolant pump to the timing chain housing and the timing chain housing nuts. Tighten the timing chain housing nuts to 26 Nm (19 ft. lbs.).
11. Lower the vehicle.
12. Tighten the timing chain housing to the camshaft housing bolts.
^ (1) (M8 X 1.25 X 25) 26 Nm (19 ft. lbs.).
^ (2) (M10 X 1.55 X 55) 50 Nm (37 ft. lbs.).
^ (3) (M8 X 1.25 X 35) 29 Nm (21 ft. lbs.).
13. Install the camshaft sprockets. The camshaft sprockets are identical and interchangeable.
14. Install the camshaft sprocket bolts and the washers.
15. Tighten the camshaft sprocket bolts and the washers while holding the sprocket with the crankshaft balancer holder. Tighten the camshaft sprocket bolts to 70 Nm (52 ft. lbs.).
16. Use the Adhesive/Sealant Compound GM P/N 12345493 or the equivalent on the camshaft sprocket bolts.
17. Clean the old sealant off of the bolt with a wire brush.
18. Clean the threaded hole in the camshaft with a round nylon brush.
19. Clean the threaded hole in the camshaft with a round nylon brush.
NOTE: The side of the timing chain that was marked during the removal must be showing when the chain is installed.
20. Install the timing chain and the tensioner.
21. Install the front cover and the gaskets.
22. Connect the negative battery cable.