Oil Pump: Inspection
WARNING: This page is about a different car, the 2004 Chrysler Pacifica. However, it is still accessible from the selected car via links, so may be relevant.
- Disassemble oil pump. (Refer to DISASSEMBLY )
- Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. Replace pump cover if scratched or grooved.
- Lay a straightedge across the pump cover surface (Fig 1 ). If a 0.025 mm (0,001 in.) feeler gauge can be inserted between cover and straight edge, cover should be replaced.
- Measure thickness and diameter of outer rotor. If outer rotor thickness measures 14.299 mm (0.563 in.) or less (Fig 2 ), or if the diameter is 79.78 mm (3.141 inches.) or less, replace outer rotor.
- If inner rotor measures 14.299 mm (0.563 in.) or less replace inner rotor (Fig 3 ).
- Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body (Fig 4 ). If measurement is 0.39 mm (0.015 inch.) or more, replace body only if outer rotor is in specifications.
- Install inner rotor into body. If clearance between inner and outer rotors (Fig 5 ) is 0.20 mm (0.008 inch.) or more, replace both rotors.
- Place a straightedge across the face of the body, between bolt holes. If a feeler gauge of 0.077 mm (0.003 in.) or more can be inserted between rotors and the straightedge, replace pump assembly (Fig 6 ) ONLY if rotors are in specs.
- 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 (Fig 7 ) has a free length of approximately 49.5 mm (1.95 in.) it should test between 101-110 N (23-25 lbs.) when compressed to 34 mm (1-11/32 in.). Replace spring that fails to meet specifications.
- Assemble oil pump. (Refer to ASSEMBLY )