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IH: Oiling & Lubrication - Sub-03A

77-85 Oil Pump Damage Pics


Oil pump from an 83 model ¹⁾	Gearshaft pin broke off into this 77 model ²⁾

Many used oil pumps have scratches on both the gerotors and pump surfaces that the gerotors ride on.
But, there is one certain spot that seems to be scratched more times than others. ³⁾
- It's on the larger of the two pads in the pump body and the cover seem to usually have more wear.
- Sometimes, the small pad is scratched or damaged also but not always.
- The gap between the inner and outer gerotors on both the feed and return sides tends to be scratched as in the pics below.
- Debris caught between these two gears cannot slide over and fall to the other cavity and out of the pump.
- It gets locked between the gears and ripped across the aluminum surface.