Installation

Disassembled Upper Engine:

Legend:

Disassembled Lower Engine:

Legend:

INSTALL OR CONNECT

NOTE: Prior to installing timing chain housing, be sure the alignment dowel pins are in the cylinder lock and the timing chain housing. The dowel pins ensure proper chain housing and front cover location for correct front oil seal-to-crankshaft alignment.

1. Timing chain housing and new gaskets (no sealer needed).
2. Chain housing to camshaft housing bolts hand tight.
3. Raise the vehicle.
4. Timing chain housing to block fasteners (48 and 49) hand tight.
5. Oil pan to timing chain housing bolts (36) hand tight.

Timing Chain Housing Fasteners:

6. Tighten timing chain housing to block fasteners (48 and 49) to 26 Nm (19 lbs. ft.).

7. Oil/air separator hose to chain housing.
8. Tighten oil pan to timing chain housing bolts to 12 Nm (106 lbs. in.).
9. Chain housing to belt tensioner bracket brace (147). Torque bolt (149) to 26 Nm (19 lbs. in.). Torque bolt (150) to 28 Nm (21 lbs. ft.).
10. Lowest front cover retaining stud into timing chain housing.
11. Lower the vehicle.
12. Tighten timing chain housing to camshaft housing bolts (49) 26 Nm (19 lbs. ft.).
13. Camshaft sprocket(s).
- Sprockets are identical and interchangeable.
14. Camshaft sprocket bolt(s) and washer(s). Tighten to 70 Nm (52 lbs. ft.) while holding sprocket(s) with J 39579 or equivalent camshaft sprocket wrench. Use Adhesive/Sealant Compound GM P/N 12345493 or equivalent on camshaft sprocket bolt(s).
- Clean old sealant off of the bolt with a wire brush.
- Clean the threaded hole in the camshaft with a M10 x 1.25 tap.
15. Coolant pump assembly to timing chain housing and install nuts hand tight. Lubricate splines with Chassis Grease GM P/N 1051344 or equivalent.

If installing a replacement timing chain housing lube "0" ring with an anti-freeze solution, then slide coolant pump cover over radiator outlet pipe (Do not damage "0" ring). Install and rotate bolts just enough to close all gaps in this order:
- Cover to pump assembly.
- Cover to block.
- Cover to inlet.
- Tighten bolts/nuts completely to specifications in order:
- Pump assembly to chain housing nuts and torque to 26 Nm (19 lbs. in.)
- Pump cover to pump assembly and torque 14 Nm (124 lbs. in.).
- Cover to block, bottom bolt first and torque to 26 Nm (19 lbs. in.).
- Inlet to cover.

Exhaust Manifold:

- Exhaust manifold to cylinder head retaining nuts (160), follow the tightening sequence and tighten to 42 Nm (31 lbs. ft.).
- Exhaust manifold brace to manifold bolt and torque to 54 Nm (40 lbs. ft.).
16. Timing chain.
17. Front cover and new gaskets and tighten to 12 Nm (106 lbs. in.).
18. Coolant pump assembly to timing chain nuts (if not previously installed). Tighten to 26 Nm (19 lbs. ft.). If re-using the same timing chain housing, skip steps 18, 20 and 21.
19. Exhaust manifold nuts into exhaust pipe flange.
- Turn both nuts in evenly to avoid cocking the exhaust pipe and binding the nuts.
20. Manifold to exhaust pipe nuts and torque to 26 Nm (19 lbs. ft.).
21. Exhaust manifold heat shields.
22. Oxygen sensor connector.
23. Negative battery cable.
24. Start engine.
25. Inspect for oil and coolant leaks.