Oil Pump: Inspection
- 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.
Courtesy of DAIMLERCHRYSLER CORP.
- 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.
Courtesy of DAIMLERCHRYSLER CORP.
- If inner rotor measures 14.299 mm (0.563 in.) or less replace inner rotor (Fig 3).
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- 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.
Courtesy of DAIMLERCHRYSLER CORP.
- 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.
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- 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.
Courtesy of DAIMLERCHRYSLER 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 (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 (1-1/32 in.). Replace spring that fails to meet specifications.
Courtesy of DAIMLERCHRYSLER CORP.
- Assemble oil pump. (Refer to ASSEMBLY ).