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:
โข Pressure test indicates low or no pump pressure
โข High mileage overhaul
โข Overhaul cause by oil pump failure
โข Overhaul to correct problem that generated sludge, varnish
โข Overhaul due to failure that produced chips, debris
โข 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.
