Hummer H1 (1992-1998). Instruction - page 27

2-32. FUEL INJECTION PUMP REPAIR (Cont’d)

60. Remove terminal (2), washer (3), and shell (4) from stud (9).

61. Remove nut (5), lockwasher (6), washer (7), and fiber washer (8) from stud (9). Discard lockwasher (6).
62. Remove locknut (14), ground strap (13), lockwasher (6), nut (5), lockwasher (6), washer (7), and fiber

washer (8) from stud (11). Discard locknut (14) and lockwashers (6).

63. Remove electrical shutoff solenoid (10) from cover (12).
64. Remove check valve (1) and O-ring (15) from cover (12). Discard O-ring (15).

2-96

2-32. FUEL INJECTION PUMP REPAIR (Cont’d)

65. Remove terminal (2), washer (3), and shell (16) fromstud (20).
66. Remove nut (5), lockwasher (6), washer (7), and fiber washer (8) from stud (20). Discard

lockwasher (6).

67. Remove locknut (14), nut (5), lockwasher (6), washer (7), and fiber washer (8) from stud (17). Discard

lockwasher (6) and locknut (14).

68. Remove cold advance solenoid (18) and plunger (19) from cover (12).
69. Remove plunger (19) from cold advance solenoid (18).

2-97

2-32. FUEL INJECTION PUMP REPAIR (Cont’d)

CAUTION

Do not handle precision ground surface of rotor to avoid

contamination.

Handle all parts carefully with clean hands wet with calibrating

fluid to avoid contamination.

Do not immerse hydraulic head in solvent or sealant damage

may result.

1. Clean all fuel injection pump components in accordance with instructions in para. 2-9.

2. Rinse hydraulic head (1) and rotor (2) in calibrating fluid.

c. Inspection

NOTE

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

1. Inspect housing (5) for damage. Replace injection pump if damaged.

2. Inspect pilot tube (4) in housing (5) for scoring or damage. If scored or damaged, perform steps 3

through 7, if not, go to step 8.

3. Remove pilot tube (4) and drive shaft bearing (3) from housing (5) using pilot tube mandrel.

Discard pilot tube (4).

4. Inspect drive shaft bearing (3) for roughness or damage. Discard if rough or damaged.

2-98

2-32. FUEL INJECTION PUMP REPAIR (Cont’d)

5.
6.

7.
8.

9.

10.

Apply sealing compound to outside diameter of pilot tube (4).
Using pilot tube mandrel, install pilot tube (4) in housing (5) until groove (6) in pilot tube (4) aligns
with vent hole (7) in housing (5).
Using drive shaft bearing installer, install drive shaft bearing (3) in housing (5). Go to step 11.

Inspect drive shaft bearing (3) for roughness or damage. If rough or damaged, perform steps 9
and 10. If not, go to step 11.
Remove drive shaft bearing (3) from housing (5) and discard bearing (3).
Using drive shaft bearing installer, install driveshaft bearing (3) in housing (5).

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