CAP-VALVE 5203016 - Caterpillar

Illustration 1. Oil pump cover specifications.2. Check for grooves on the face. Grooves which connect the oil passages are not acceptable because they will permit oil to leak between the passages. See Illustration 2. The face of this cover must be machined.
Illustration 2. Grooves that connect the oil passages; cover must be machined.If small grooves are present and they do not connect the oil passages, the cover can be used again. See Illustration 3.
Later oil pump covers have an O-ring groove in the face. If more than .13 mm (.005") of material is removed from the face of one of these covers, the O-ring groove will also have to be machined. See Illustration 1.3. Check the pressure valve seat area. Cracks or gouges (deep scratches) are not permitted in this area. See Illustration 4.
Illustration 3. Normal wear; use again.
Illustration 4. Cracks or gouges; do not use again.Even wear in the seat area is acceptable and the cover can be used again. See Illustration 5. Some oil leakage in the seat area is permitted.
This article is only to be used as a general guide to find if oil pump covers can be used again. Remember, each part may not be exactly like those shown.
Illustration 5. Normal wear; use again.