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Oil Pump: Inspection

  1. Ensure mating surface of oil pump housing is smooth. If oil pump housing cover is scratched or grooved, replace oil pump cover. Using a straightedge and a feeler gauge, check flatness of oil pump cover. Replace cover if it is equal to or exceeds specification. See OIL PUMP SPECIFICATIONS  table.
  2. Measure thickness of both rotors. Replace rotors if not within specification. See OIL PUMP SPECIFICATIONS  table.
  3. Install outer rotor into oil pump housing. Measure clearance between outer rotor and oil pump housing. If clearance is equal to or exceeds specification but outer rotor O.D. is within specification, replace timing belt cover.
  4. Install inner rotor, and measure clearance between inner and outer rotors. Replace pump assembly if clearance is equal to or exceeds specification. See OIL PUMP SPECIFICATIONS  table.
  5. Place a straightedge across oil pump housing, between bolt holes. Using a feeler gauge, check clearance between straightedge and oil pump rotors. If clearance is equal to or exceeds specification and rotors are at correct thickness, replace oil pump assembly.
  6. Ensure pressure relief valve slides freely in bore and is free from scoring. If small marks are present, they may be removed using 400-grit dry sandpaper. Check free length and pressure of pressure relief valve spring. Replace spring if it is not within specification. See OIL PUMP SPECIFICATIONS  table.
CAUTION: Oil pump pressure relief valve must be installed in same position as illustrated. See Figure.
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