Hummer H1 (1992-1998). Manual - part 6

Change 1          2-13

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

d. Exhaust Manifolds

NOT E

Early production vehicles may have a socket-head screw in place of stud.

1.

Remove stud (6) and washer (7) securing left exhaust manifold (8) to cylinder head (9).

NOT E

Turbo exhaust manifolds use hex-head capscrews and do not have gaskets
as indicated in steps 2 and 3.

2.

Using 8-mm hex-head driver, remove seven socket-head screws (12), washers (11), left exhaust
manifold (8), and gasket (10) from cylinder head (9). Discard gasket (10).

3.

Using 8-mm hex-head driver, remove eight socket-head screws (17), washers (16), right exhaust
manifold (15), and gasket (14) from cylinder head (13). Discard gasket (14).

LEFT EXHAUST MANIFOLD

TURBO LEFT EXHAUST MANIFOLD

TURBO RIGHT EXHAUST MANIFOLD

RIGHT EXHAUST MANIFOLD

2-14          Change 1

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

e. Intake Manifold

1.

Remove fuel filter line clamp (1) from stud (2).

NOTE

• Note location of studs for installation.
• Perform step 2 for 6.2L engines. Perform step 3 for 6.5L engines.

2.

Remove six intake manifold capscrews (5), ten studs (2), and sixteen washers (3).

3.

Remove four intake manifold capscrews (5), twelve studs (2), and sixteen washers (3).

4.

Remove four injection line clips (4).

5.

Remove intake manifold (6) and two gaskets (7) from cylinder heads (8). Discard gaskets (7).

NOTE

• Perform steps 6 through 8 for turbo engines.
• Outer intake manifold is removed before engine is removed from

vehicle.

6.

Remove eight intake manifold studs (8.1) from intake manifold (8.2).

.

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.

7.

Remove intake manifold (8.2) and gasket (8.3) from cylinder head (8.4).  Discard gasket (8.3).

8.

Repeat steps 6 and 7 for opposite side.

Change 1

2-15

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

f. Water Crossover

1.

Remove four capscrews (9) securing water crossover (14) to cylinder heads (8).

2.

Loosen hose clamp (12) and disconnect thermostat bypass hose (11) from water crossover nipple (13).

.

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.

3.

Remove water crossover (14) and two gaskets (10). Discard gaskets (10).

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

g. Fuel Injection Lines

WARNING

Diesel fuel is highly flammable. Do not perform this procedure
near fire, flame, or sparks. Severe injury or death by result.

1. Loosen and disconnect eight fuel injection line nuts (4) at injection nozzles (3).

2. Remove four screw-assembled washers (5) and clamps (6) from support brackets (2).

CAUTION

Plug fuel injection pump openings to prevent contamination.

NOTE

Tag lines by cylinder number for assembly.

3. Remove clamp (8) and boot (9) from fuel injection pump (1). Disconnect and remove eight fuel

injection lines (7) at fuel injection pump (1).

2-16