Hummer H1 (1992-1998). Manual - part 7

2-15. ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

h. Fuel Supply and Return Lines

1. Loosen clamp (11) and remove fuel filter inlet hose (12) from fuel supplY line (10).

2. Disconnect fuel supply line (10) at fuel pump (27).

3. Remove stud (24), washer (25), two clamps (28) and fuel supply line (10) from fuel return line (18)

and cylinder block (29).

4. Remove nut (19), washer (20), and clamp (21) from fuel return line (18) and rocker arm cover

stud (22).

5. Remove capscrew (13), washer (14), and clamp (15) from fuel return line (18) and timing gear

cover (26).

6. Loosen three clamps (16) and disconnect three hoses (17) at fuel injection pump (1) and front fuel

injection nozzles (23).

7. Remove fuel return line (18).

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Change 1

2 - 1 5 . ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

i. Modulator Link

NOT E

Removal of the modulator link is applicable only to 6.2L engines.

1.

Remove two capscrews (2) securing modulator link bracket (3) to cylinder head (6).

.

WARNING

.

Gaskets installed on some 6.2L engines assembled prior to 1991
may contain asbestos.  Gaskets should be removed with a scraper
or putty knife and then be disposed of IAW current directives.
Inhalation of asbestos fibers can cause respiratory ailments.

2.

Slide modulator link (1) forward and disconnect from fuel injection pump (7) and remove bracket (3),
modulator link (1), water jacket cover (4), and gasket (5). Discard gasket (5).

2-15. ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

j. Rocker Arm Covers

1. Remove two nuts (8) and injection line support bracket (9) from rocker arm cover studs (14).

2. Remove a combination of three capscrews (10), five studs (14), eight washers (11), rocker arm

cover (12), and gasket (13) (if applicable) from cylinder head (6).

3. Repeat steps 1 and 2 for opposite side.

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 2-15. ENGINE DISASSEMBLY INTO SUBASSEMBLIES (Cont’d)

 k. Rocker Arm Shafts and Pushrods 

1. Remove four capscrews (3) and four retainers (2) from rocker arm and shaft assembly (4) and

cylinder head (5).

NOTE

Tag rocker arm and shaft assembly for assembly.

2. Remove two rocker arm and shaft assemblies (4).

NOTE

Tops of pushrods are hardened and must be tagged for assembly.

3. Remove eight pushrods (1).

4. Repeat steps 1 through 3 for opposite side.

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