The oil pump can be disassembled for inspection if desired but not overhauled. The pump is serviced only as a complete assembly. Individual pump parts are not available. The pump shaft, pickup tube clamp and bolt, and pump mounting 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, varnish
• 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 available only as part of the drive assembly.
