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Oil Pump: Inspection

WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
  1. Disassemble the oil pump. (Refer to ENGINE/LUBRICATION/OIL PUMP - DISASSEMBLY) 
  2. Clean all oil pump components. (Refer to ENGINE/LUBRICATION/OIL PUMP - CLEANING) 
  3. 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).
  4. Lay a straightedge across the pump cover surface. See Fig 1. If a 0.025 mm (0.001 in.) feeler gauge can be inserted between cover and straight edge, cover should be replaced.
    Fig 1: Checking Oil Pump Cover Flatness
    GC0003858Courtesy of DAIMLERCHRYSLER CORP.
    1 - STRAIGHT EDGE
    2 - FEELER GAUGE
    3 - OIL PUMP COVER
  5. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.474 mm (0.373 in.) or less, or if the diameter is 89.174 mm (3.5108 in.) or less, replace outer rotor. See Fig 2.
    Fig 2: Measuring Outer Rotor Thickness
    GC0015367Courtesy of DAIMLERCHRYSLER CORP.
    Fig 3: Measuring Inner Rotor Thickness
    GC0015366Courtesy of DAIMLERCHRYSLER CORP.
    Fig 4: Measuring Outer Rotor Clearance In Housing
    GC0015368Courtesy of DAIMLERCHRYSLER CORP.
    1 - FEELER GAUGE
    2 - OUTER ROTOR
    Fig 5: Measuring Clearance Between Rotors
    GC0015369Courtesy of DAIMLERCHRYSLER CORP.
    1 - OUTER ROTOR
    2 - FEELER GAUGE
    3 - INNER ROTOR
  6. If inner rotor measures 9.474 mm (0.373 in.) or less replace inner rotor. See Fig 3.
  7. Slide outer rotor into body, press to one side with fingers and measure clearance between rotor and body. See Fig 4. If measurement is 0.39 mm (0.015 in.) or more, replace body only if outer rotor is in specifications.
  8. Install inner rotor into body. If clearance between inner and outer rotors is 0.20 mm (0.008 in.) or more, replace both rotors. See Fig 5.
  9. 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. See Fig 6ONLY  if rotors are in specification.
    Fig 6: Measuring Clearance Over Rotors
    GC0015370Courtesy of DAIMLERCHRYSLER CORP.
    1 - STRAIGHT EDGE
    2 - FEELER GAUGE
  10. 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.
  11. The relief valve spring has a free length of approximately 49.5 mm (1.95 in.) it should test between 23 - 25 pounds when compressed to 34 mm (1.34 in.). Replace spring that fails to meet specifications.
  12. Assemble oil pump. (Refer to ENGINE/LUBRICATION/OIL PUMP - ASSEMBLY) 
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