REMOVAL & INSTALLATION
See Figures 1 through 10
- Disconnect the negative battery cable.
- Remove the timing belt, as outlined later in this section.
- Raise and safely support the vehicle.
- Drain the engine oil into a suitable container.
- Remove the oil pan, as outlined earlier.
- Remove the crankshaft sprocket using a suitable puller.
- Remove the oil pickup tube.
- Remove the oil pump and the front crankshaft seal.
- Remove the oil pump cover screws, then lift the cover off.
- Remove the oil pump rotors.
Wash all parts in a suitable solvent, then inspect carefully for damage or wear, as follows:
Clean all parts thoroughly. The mating surface of the oil pump should be smooth. Replace the pump cover if it is scratched or grooved.
Lay a straightedge across the pump cover surface. If a 0.003 in. (0.076mm) feeler gauge can be inserted between the cover and the straight edge, the cover should be replaced.
Measure the thickness and diameter of the outer rotor. If the outer rotor thickness measures 0.21 in. (7.64mm) or less, or if the diameter is 3.148 in. (79.95mm) or less, replace the outer rotor.
- If the inner rotor measures 0.21 in. (7.64mm) or less, replace the inner rotor.
Slide the outer rotor into the pump housing, press to one side with your fingers and measure the clearance between the rotor and the housing. If the measurement is 0.015 in. (0.39mm) or more, replace the housing only f the outer rotor is within specification.
- Install the inner rotor into the pump housing, If the clearance between the inner and outer rotors is 0.008 ion. (0.203mm) or more, replace both rotors.
- Place a straightedge across the face of the pump housing, between the bolt holes. If a feeler gauge of 0.004 in. (0.102mm) or more can be inserted between the rotors and the straightedge. replace the pump assembly ONLY if the rotors are within specifications.
- Inspect the 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 about 2.39 in. (60.7mm) and should test between 18-19 lbs. when compressed to 1.60 in. (4.05mm). Replace the spring if it falls outside of specifications.
- If the oil pressure is low and the pump is within specifications, inspect for worn engine bearings or other reasons for oil pressure loss.
- Clean all parts thoroughly. The mating surface of the oil pump should be smooth. Replace the pump cover if it is scratched or grooved.
- Assemble the pump, using new parts as required. Install the inner rotor with the chamfer facing the cast iron oil pump cover.
- Apply Mopar or equivalent gasket maker to the oil pump as shown in the accompanying figure. Install the oil ring into the oil pump body discharge passage.
- Prime the oil pump before installation by filling the rotor cavity with engine oil.
- Align the oil pump rotor flats with the flats on the crankshaft as your install the oil pump to the block.
The front crankshaft seal MUST be out of the pump to align, or damage may result.