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.
- Clean all parts thoroughly. Mating surface of the oil pump should be smooth. See Fig 1. Replace pump cover if scratched or grooved.
- 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.
- Measure thickness and diameter of outer rotor. If outer rotor thickness measures 9.40 mm (0.370 in.) or less, or if the diameter is 79.95 mm (3.148 in.) or less, replace outer rotor. See Fig 3.
- If inner rotor measures 9.40 mm (0.370 in.) or less replace inner rotor. See Fig 4.
Courtesy of DAIMLERCHRYSLER CORP.
| 1 - O-RING |
| 2 - SEAL |
| 3 - INNER ROTOR |
| 4 - OIL PUMP COVER |
| 5 - FASTENER |
| 6 - OUTER ROTOR |
| 7 - OIL PUMP BODY |
Courtesy of DAIMLERCHRYSLER CORP.
| 1 - STRAIGHT EDGE |
| 2 - FEELER GAUGE |
| 3 - OIL PUMP COVER |
- Slide outer rotor into pump housing, press to one side with fingers and measure clearance between rotor and housing. See Fig 5. If measurement is 0.39 mm (0.015 in.) or more, replace housing only if outer rotor is in specification.
- Install inner rotor into pump housing. If clearance between inner and outer rotors is 0.203 mm (0.008 in.) or more, replace both rotors. See Fig 6.
- Place a straightedge across the face of the pump housing, between bolt holes. If a feeler gauge of 0.102 mm (0.004 in.), or more can be inserted between rotors and the straightedge, replace pump assembly. See Fig 7, ONLY
if rotors are in specifications.
- 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 has a free length of approximately 60.7 mm (2.39 inches) it should test between 18 and 19 pounds when compressed to 40.5 mm (1.60 inches). Replace spring that fails to meet specifications.
Courtesy of DAIMLERCHRYSLER CORP.
Courtesy of DAIMLERCHRYSLER CORP.
- If oil pressure is low and pump is within specifications, inspect for worn engine bearings or other reasons for oil pressure loss.
Courtesy of DAIMLERCHRYSLER CORP.
| 1 - FEELER GAUGE |
| 2 - OUTER ROTOR |
Courtesy of DAIMLERCHRYSLER CORP.
| 1 - FEELER GAUGE |
| 2 - INNER ROTOR |
| 3 - OUTER ROTOR |
Courtesy of DAIMLERCHRYSLER CORP.
| 1 - FEELER GAUGE |
| 2 - STRAIGHT EDGE |