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Pump - Engine Oil: Inspection

WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
CAUTION: Oil pump pressure relief valve and spring should not be removed from the oil pump. If these components are disassembled and or removed from the pump the entire oil pump assembly must be replaced.
  1. Clean all parts thoroughly. Mating surface of the oil pump housing should be smooth. If the pump cover is scratched or grooved the oil pump assembly should be replaced.
  2. Lay a straight edge across the pump cover surface. See Fig 1. If a 0.025 mm (0.001 in.) feeler gauge can be inserted between the cover and the straight edge the oil pump assembly should be replaced.
  3. Measure the thickness of the outer rotor. See Fig 2. If the outer rotor thickness measures at 12.005 mm (0.472 in.) or less the oil pump assembly must be replaced.
  4. Measure the diameter of the outer rotor. If the outer rotor diameter measures at 85.925 mm (3.382 in.) or less the oil pump assembly must be replaced.
  5. Measure the thickness of the inner rotor. See Fig 3. If the inner rotor thickness measures at 12.005 mm (0.472 in.) or less then the oil pump assembly must be replaced.
  6. Slide outer rotor into the body of the oil pump. Press the outer rotor to one side of the oil pump body and measure clearance between the outer rotor and the body. See Fig 4. If the measurement is 0.235mm (0.009 in.) or more the oil pump assembly must be replaced.
  7. Install the inner rotor in the into the oil pump body. Measure the clearance between the inner and outer rotors. See Fig 5. If the clearance between the rotors is.150 mm (0.006 in.) or more the oil pump assembly must be replaced.
  8. Place a straight edge across the body of the oil pump (between the bolt holes), if a feeler gauge of.095 mm (0.0038 in.) or greater can be inserted between the straightedge and the rotors, the pump must be replaced. See Fig 6.
NOTE: The 3.7L Oil pump is released as an assembly. There are no DaimlerChrysler part numbers for Sub-Assembly components. In the event the oil pump is not functioning or out of specification it must be replaced as an assembly.
Fig 1: Checking Oil Pump Cover Flatness
GC0003858Courtesy of DAIMLERCHRYSLER CORP.
1 - STRAIGHT EDGE
2 - FEELER GAUGE
3 - OIL PUMP COVER
Fig 2: Measuring Outer Rotor Thickness
GC0003859Courtesy of DAIMLERCHRYSLER CORP.
Fig 3: Measuring Inner Rotor Thickness
GC0003860Courtesy of DAIMLERCHRYSLER CORP.
Fig 4: Measuring Outer Rotor Clearance
GC0003861Courtesy of DAIMLERCHRYSLER CORP.
1 - FEELER GAUGE
2 - OUTER ROTOR
Fig 5: Measuring Clearance Between Rotors
GC0003862Courtesy of DAIMLERCHRYSLER CORP.
1 - OUTER ROTOR
2 - FEELER GAUGE
3 - INNER ROTOR
Fig 6: Measuring Clearance Over Rotors
GC0003863Courtesy of DAIMLERCHRYSLER CORP.
1 - STRAIGHT EDGE
2 - FEELER GAUGE
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