Hummer H1 (1992-1998). Manual - part 22

2-26. OIL PAN REPAIR

This task covers:

a. Cleaning

b. Inspection

INITIAL SETUP

Tools

Equipment Condition

General mechanic’s tool kit:

Engine disassembled into subassemblies

automotive (Appendix E, Item 1)

(para. 2-15).

Manual References

Clean oil pan (3) in accordance with para. 2-9.

b. Inspection

NOTE

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

1. Inspect oil pan (3) for cracks, damage, and sealing surface distortion. Replace if cracked, damaged,

or sealing surface is distorted.

2. Inspect drainplug (1) for damage. Replace if damaged.
3. Inspect gasket (2) for damage. Replace if damaged.

2-27. OIL PUMP REPAIR

This task covers:

a. Disassembly

c. Inspection

b. Cleaning

d. Assembly

INITIAL SETUP:

Tools

Equipment Condition

General mechanic’s tool kit:

Engine disassembled

automotive (Appendix E, Item 1)

(para. 2-15).

Hammer, soft head (Appendix E, Item 30)

Materials/Parts

Lubricating oil, OE/HDO (Appendix B,
Item 13)

Manual References

into subassemblies

a. Disassembly

1. Remove shaft extension (10) and coupling (9) from pump body (8).
2. Remove four capscrews (3) and pump cover (5) from pump body (8).

3. Mark drive gear (7) and idler gear (6) for assembly and remove.
4. Remove retaining pin (4), regulator spring (l), and pressure regulator valve (2).

b. Cleaning

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

c. Inspection

NOTE

● 

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

● 

Pump body, pump cover, and pump gears are not serviced

separately. If any of these parts require replacement, replace
entire oil pump.

1. Inspect pump body (8) and pump cover (5) for damage. Replace oil pump if damaged.

2. Inspect drive gear (7) and idler gear (6) for damage. Replace oil pump if damaged.
3. Inspect regulator valve (2) for scoring or nicks. Replace if scored or nicked.
4. Inspect regulator spring (1) for damage. Replace if damaged.

5. Inspect shaft extension (10) and coupling (9) for damage. Replace if damaged.

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2-27. OIL PUMP REPAIR (Cont’d)

2-79

2-27. OIL PUMP REPAIR (Cont’d)

6.

7.

8.
9.

10.
11.

12.

13.

Inspect oil screen (7) for damage or blockage. If blocked or damaged, perform steps 8 through 12;
if not, go to next step.
Inspect pickup tube bracket (9) for damage. If damaged, perform steps 8 and 12; if not, go to step

Remove capscrew (8) and pickup tube bracket (9) from oil screen (7).
Place pump cover (5) in soft-jawed vise.
Using soft-head hammer, remove oil screen (7) from pump cover (5).

Using soft-head hammer, install oil screen (7) in pump cover (5) until bead (6) seats on pump
cover (5).
Install pickup tube bracket (9) on oil screen (7) and install capscrew (8). Finger tighten
capscrew (8).
Inspect regulator valve plug (10) for damage. Replace if damaged.

13.

d. Assembly

NOTE

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

1. Install regulator valve (2) and regulator spring (1) in pump cover (5) with retaining pin (4).

2. Install drive gear (15) and idler gear (11) into pump body (14) and aline reference marks.
3, Apply small amount of OE/HDO into pump body (14).
4. Install pump cover (5) on pump body (14) with four capscrews (3). Tighten capscrews (3) to 120 lb-in.

(14 Nžm).

5. Install coupling (12) and shaft extension (13) on end of drive gear (15).

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