Hummer H1 (1992-1998). Manual - part 20

2-21. CYLINDER HEAD AND VALVE REPAIR (Cont’d)

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 2-21. CYLINDER HEAD AND VALVE REPAIR (Cont’d)

10. Apply pipe sealing compound to cold start advance switch (1) and install in right cylinder head (2).
11. Install water jacket cover gasket (5) and water jacket cover (4) on right cylinder head (2) and secure

with two capscrews (3). Tighten capscrews (3) to 25-37 lb-ft (3450 Nžm).

12. Apply pipe sealing compound to engine temperature sending unit (6) and install in left cylinder

head (2).

13. Install four precombustion chambers (7) in cylinder head (2) flush to +0.002 in. (0.050 mm).
14. Repeat step 13 for opposite cylinder head.

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2-21. CYLINDER HEAD AND VALVE REPAIR (Cont’d)

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2-22. VALVE TRAIN REPAIR

This task covers:

a. Disassembly

c. Inspection

b. Cleaning

d. Assembly

INITIAL SETUP

Tools

Equipment Condition

General mechanic’s tool kit:

Engine disassembled into subassemblies

autmotive (Appendix E, Item 1)

(para. 2-15).

Materials/Parts

Four retainers (Appendix D, Item 36)

Manual References

a. Disassembly

NOTE

Tag rocker arms for assembly.

1. Remove four retainers (2) and rocker arms (3) from rocker shaft (1). Discard retainers (2).

2. Repeat step 1 for remaining rocker arm and shaft assemblies.

Clean all components in accordance with para. 2-9.

c. Inspection

NOTE

For general inspection instructions, refer to para. 2-10.

1. Inspect rocker shaft (1) for damage. Replace if damaged.

2. Inspect rocker arms (3) for damage. Replace if damaged.
3. Inspect pushrods (4) for blocked oil passages and damage. Replace if damaged or oil passages

are blocked.

4. Inspect lifters (5) for damage. Replace if damaged.
5. Inspect roller (6) on lifter (5) for scoring and binding. Replace lifter (5) if scored or binding.

d. Assembly

NOTE

For general assembly instructions, refer to para. 2-12.

1. Install four rocker arms (3) on rocker shaft (1) with four retainers (2).

2. Repeat step 1 for remaining rocker arm and shaft assemblies.

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