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Home >> BMW >> 1989 >> 735iL >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Overhaul - ZF 4HP 22H/Eh & ZF 4HP 24-E >> Component Disassembly & Reassembly >> Primary (Oil) Pump >> Inspection

Primary (Oil) Pump: Inspection

  1. Clean all parts and check for signs of damage or scoring. Check clearance between pump driven gear and pump body. Pump driven gear-to-pump body clearance should be .003-.006" (.07-.15 mm).
  2. Check pump body-to-pump driven gear radial play while rotating pump driven gear 360 degrees. Pump body-to-pump driven gear radial play should be .0008-.0016" (.020-.040 mm). Check clearance of primary pump with Engaging Bushing (243140).
  3. Using depth micrometer, measure gear axial clearance from surface of pump body to surface on pump gear on both pump drive and driven gears. Gear axial clearance should be .008-.016" (.20-.40 mm). If any component is defective or measurement is not within specification, replace oil pump assembly.
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