For 1990-2009 cars

1. Disassemble the pressure relief valve.
2. Remove the oil pump gerotor cover and bolts.
3. Clean all of the parts in cleaning solvent. Remove varnish, sludge, and dirt.
4. Inspect the oil pump for wear and scoring. Ensure that all components are within specifications. Refer to Engine Mechanical Specifications.
5. Replace the front cover and oil pump assembly if it is out of specification or damaged.