Removal
Disassembled Upper Engine:
Legend:
Disassembled Lower Engine:
Legend:
REMOVE OR DISCONNECT
1. Negative battery cable.
2. Coolant surge tank using hose clamp tool J 37097 or equivalent.
3. Drain coolant.
4. Serpentine drive belt.
WARNING: To avoid personal injury when rotating the serpentine belt tensioner, use a tight fitting 13 mm wrench that is at least 61 cm (24") long. This operation can be done using available tool J 36059 (or equivalent).
NOTE : If Re-using the same timing chain housing, skip steps 5, 6, 7, 8, 9, 15, 16, 17, 18 and 19.
5. Oxygen sensor electrical connection.
6. Exhaust heat shields.
7. Exhaust manifold brace to manifold bolt.
8. Break loose the manifold to exhaust pipe spring loaded nuts using a 13 mm box wrench.
9. Raise vehicle.
10. Right front wheel and tire assembly.
11. Right lower splash shield.
12. Balancer bolt using tool J 38122 or equivalent to prevent crankshaft rotation when loosening bolt.
13. Balancer using tool J 24420-B or equivalent.
14. Engine front cover lower bolts and nut.
15. Thread the manifold to exhaust pipe nuts out of the exhaust pipe flange by using a 5.5 mm (7/32") socket and rotate clockwise (as if tightening a nut with right hand threads or removing a nut with left hand threads).
It is necessary to relieve the spring pressure from one nut prior to removing the second nut. If the spring pressure is not relieved it will cause the exhaust pipe to twist and bind up the nut as it is removed. Relieve the spring pressure by:
- Thread one nut out 4 turns.
- Move to the other nut and turn it all the way out of the exhaust pipe flange.
- Return to the first nut and rotate it the rest of the way out of the exhaust pipe flange.
16. Pull down and back on the exhaust manifold.
17. Lower vehicle.
Exhaust Manifold:
18. Exhaust manifold to cylinder head retaining nuts (Item 160).
19. If installing a replacement timing chain housing:
- Drain engine coolant.
- Heater hose from thermostat housing using J 37097 or equivalent.
(this allows the cylinder block to more completely drain).
- Radiator outlet pipe inlet to coolant pump cover bolts (2).
- Coolant pump cover to cylinder block bolts (2).
- Coolant pump cover to coolant pump assembly bolts (5).
- Coolant pump cover.
- Coolant pump assembly to timing chain housing nuts.
- Coolant pump assembly.
20. Coolant pump assembly to timing chain housing nuts (if not previously removed).
21. Front cover upper bolts and nuts.
22. Oil/Air separator hose from front cover.
23. Front cover.
24. Timing chain.
25. Chain housing to belt tensioner bracket brace.
Timing Chain Housing Fasteners:
26. Timing chain housing to block lower fasteners.
27. Four (4) oil pan to front cover bolts.
On operations that only require disconnecting the timing chain housing skip disassembly steps 27, 28, 30 and 35.
28. Lowest front cover retaining stud from timing chain housing
- This stud catches on the body rail if not removed.
29. Rear engine mount nut.
30. Lower vehicle.
Skip Step 31 if only disconnecting the chain housing.
31. Front engine mount upper nut, reinstall nut and tighten approximately three turns.
32. Oil/air separator hose from chain housing.
33. Camshaft sprocket retaining bolts and washers while holding sprockets with tool J 36013 or equivalent camshaft sprocket wrench.
34. Camshaft sprockets.
- Sprockets are identical and interchangeable, no marking is necessary.
35. Eight (8) chain housing to camshaft housing bolts.
- Skip Step 35 if only disconnecting the chain housing
36. Raise the engine off the front and rear mounts using a floor jack and a 46cm x 51mm x 10cm (18" x 2" x 4") piece of wood across the oil pan.
36. Position the wood to get maximum oil pan contact.
- Operate the floor jack from the right front wheel opening.
- Raise the engine until the front mount bracket contacts the nut.
37. Timing chain housing and gaskets.
NOTE: Prior to installing timing chain housing, be sure the alignment dowel pins are in the cylinder block and the timing chain housing. The dowel pins ensure proper chain housing and front cover location for correct front oil seal-to-crank shaft alignment
38. Inspect the oil pan gasket silicone bead for:
- Cuts or nicks.
- Deformation.
- Separation from the aluminum carrier. If any of these conditions are found, replace the pan gasket.
39. Inspect the silicone bead across the top of the aluminum carrier at the oil pan, to cylinder block, to timing chain housing three way joint. If the bead is damaged it may be repaired using Silicone Sealant GM P/N 1052915 or equivalent.
Use only enough sealant to restore the silicone bead to its original dimension.
NOTE: Excess application of sealant may cause part misalignment and oil leaks.