Hummer H1 Service Manual page 114

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HUB BORE
KEYWAY
INSULATOR
BOLT HOLES
Figure 2-146: Torsional Damper Inspection Points
BODY
Figure 2-147: Flywheel Inspection Points
05745159
SEAL
SURFACE
RING GEAR TEETH
HUB
OIL PUMP AND PUMP DRIVE SERVICE
The oil pump can be disassembled for inspection if desired but
not overhauled. The pump is serviced only as a complete as-
sembly. Individual pump parts are not available.
The pump shaft, pickup tube clamp and bolt, and pump mount-
ing stud are all available as service parts (Figure 2-148).
Replace the oil pump under the following conditions:
• Pressure test indicates low or no pump pressure
• High mileage overhaul
• Overhaul cause by oil pump failure
• Overhaul to correct problem that generated sludge, var-
nish
• Overhaul due to failure that produced chips, debris
• Repair caused by insufficient oil in engine
Inspect the oil pump drive gear and housing. Replace the drive
as an assembly if damaged in any way; only the drive O-ring
seal is replaceable.
The sensor on the oil pump drive is not serviceable. It is avail-
able only as part of the drive assembly.
PUMP SHAFT
OIL PUMP
(ASSEMBLY ONLY)
MOUNTING STUD
Figure 2-148: Oil Pump Serviceable Parts
Engine 2-77
CLAMP