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Oil Pump: Inspection

  1. Check gear end play by placing straightedge across pump housing. Using feeler gauge, clearance between gear and straightedge should be .001-.003" (.03-.08 mm).
  2. Using micrometer, rotor minimum thickness is .944" (23.97 mm). Rotor minimum diameter is 2.469" (62.70 mm).
  3. Using feeler gauge, gear-to-rotor maximum clearance is .008" (.20 mm). Rotor-to-pump housing maximum clearance is .014" (.35 mm). Using a straightedge across pump cover, pump cover wear maximum clearance is .003" (.08 mm).
  4. Relief valve spring free length is 1.95" (49.5 mm) and loaded is 20 lbs. at 1.34" (89 N. at 34 mm). If any measurement is not within specification, replace oil pump as an assembly.
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