Inspect

For foreign material and determine source. Pump housing and oil pump cover assembly for:

Cracks
Scoring
Casting imperfections

Pressure regulator valve for:

Scoring
Sticking. Burrs may be removed with a fine oil stone.

Pressure regulator valve spring for:

Loss of tension
Bending
If in doubt, replace the spring

Screen assembly for:

Looseness
Broken wire mesh or screen

Gerotor oil pump for:

Chipping
Galling
Wear

Measure

Gerotor housing pocket depth
Gerotor thickness

Important:

When deciding pump serviceability based on pocket depth, consider depth of wear pattern in gear pocket and face oil pump cover assembly.