Disassembly & Reassembly: Inspection
- Disassemble the oil pump. See DISASSEMBLY .
- Clean all oil pump components. See CLEANING .
- Inspect mating surface of the oil pump housing and cover. Replace oil pump if deeply scratched or grooved (minor surface scratches and polishing is normal).
- Lay a straightedge across the pump cover surface. If a 0.025 mm (0.001") feeler gauge can be inserted between cover and straight edge, cover should be replaced.
Courtesy of CHRYSLER CORP.
- Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.474 mm (0.373") or less, or if the diameter is 89.174 mm (3.5108") or less, replace outer rotor.
Courtesy of CHRYSLER CORP.
- If inner rotor measures 9.474 mm (0.373") or less replace inner rotor.
Courtesy of CHRYSLER CORP.
- Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body. If measurement is 0.39 mm (0.015") or more, replace body only if outer rotor is in specifications.
Courtesy of CHRYSLER CORP.
- Install inner rotor into body. If clearance between inner and outer rotors is 0.20 mm (0.008") or more, replace both rotors.
Courtesy of CHRYSLER CORP.
- Place a straightedge across the face of the body, between bolt holes. If a feeler gauge of 0.077 mm (0.003") or more can be inserted between rotors and the straightedge, replace pump assembly ONLY if rotors are in specification.
Courtesy of CHRYSLER CORP.
- Inspect oil pressure relief valve plunger for scoring and free operation in its bore. Small marks may be removed with 400-grit wet or dry sandpaper.
- The relief valve spring has a free length of approximately 49.5 mm (1.95") it should test between 23 - 25 pounds when compressed to 34 mm (1.34"). Replace spring that fails to meet specifications.
- Assemble oil pump. See REASSEMBLY .