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Oil Pump: 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.
  1. Inspect the mating surface of the oil pump. Surface should be smooth. See Fig 1. Replace pump cover if scratched or grooved.
  2. Lay a straightedge across the pump cover surface. See Fig 2. If a 0.025 mm (0.001 in.) feeler gauge can be inserted between cover and straight edge, cover should be replaced.
  3. Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.40 mm (0.370 in.) or less (See Fig 3), or if the diameter is 79.95 mm (3.148 in.) or less, replace outer rotor.
  4. If inner rotor measures 9.40 mm (0.370 in.) or less replace inner rotor. See Fig 4.
Fig 1: Oil Pump
GC0021256Courtesy of DAIMLERCHRYSLER CORP.
1 - O-RING
2 - SEAL
3 - INNER ROTOR
4 - OIL PUMP COVER
5 - FASTENER
6 - OUTER ROTOR
7 - OIL PUMP BODY
Fig 2: Checking Oil Pump Cover Flatness
GC0021258Courtesy of DAIMLERCHRYSLER CORP.
1 - STRAIGHT EDGE
2 - FEELER GAUGE
3 - OIL PUMP COVER
Fig 3: Measuring Outer Rotor Thickness
GC0021124Courtesy of DAIMLERCHRYSLER CORP.
Fig 4: Measuring Inner Rotor Thickness
GC0021125Courtesy of DAIMLERCHRYSLER CORP.
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