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How to change the oil pump? - 1996 Dodge Dakota

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What engine size are there?

Posted on Aug 08, 2010

  • ZJ Limited
    ZJ Limited Aug 08, 2010

    3.9L Engine

    1. Disassemble the pump.

    2. Replace the pump assembly if the cover is scratched or grooved or if the cover is warped more than 0.0015 in. (0.038mm).

    3. The minimum thickness of the outer rotor is 0.825 in. (20.96mm).
      The minimum diameter of the outer rotor is 2.469 in. (62.70mm). The
      minimum thickness of the inner rotor is 0.825 in. (20.96mm). If any of
      the above measurements are not within specifications, replace the shaft
      and both rotors.

    Fig. 12: Exploded view of the V6 engine oil pump

    1. The maximum clearance between the outer rotor and the pump body is
      0.014 in (0.356mm). Replace the pump assembly if not within

    2. Install the inner rotor and place a straightedge across the bolt
      holes. If a feeler gauge of 0.004 in. (0.101mm) or more fits, replace
      the pump assembly.

    3. The maximum clearance between the rotors is 0.010 in. (0.254mm). Replace the shaft and both rotors if not within specifications.

    Fig. 13: Exploded view of the oil pressure relief valve-V6 and V8 engines

    Fig. 14: Retainer cap installation-V6 and V8 engines

    1. Inspect the relief valve plunger for scoring. Small marks may be removed with 400 grit wet or dry sandpaper.

    2. The relief valve spring should have a free length of about 2 in. (50mm). Replace the spring if it fails to meet specifications.

    3. Assemble the pump using new parts where necessary.

    5.2L and 5.9L Engine

    1. Remove the relief valve by drilling a 1/8 in. (3mm) hole into the
      relief valve retainer cap and insert a self-threading sheet metal screw
      into the cap. Clamp the screw into a vise and while supporting the oil
      pump, remove the cap by tapping the pump body with a soft hammer.
      Discard the retainer cap and remove the spring and the relief valve.

    2. Remove the oil pump cover and lockwashers, and lift off the cover.
      Discard the oil ring seal. Remove the pump rotor and shaft, and lift
      out the outer rotor.

    Wash all parts in solvent and inspect for damage or wear. The mating
    surfaces of the oil pump cover should be smooth. Replace the pump
    assembly if this is not the case.

    1. Lay a straightedge across the pump cover surface and if a 0.0015
      in. (0.038mm) feeler gauge can be inserted between the cover and the
      straightedge, the pump assembly should be replaced. Measure the
      thickness and the diameter of the outer rotor. If the outer rotor
      thickness measures 0.825 in. (21mm) or less on 5.2L engines, or 0.943 in
      (24mm) or less on 5.9L engines, or if the diameter is 2.469 in.
      (62.7mm) or less, replace the outer rotor. If the inner rotor measures
      0.825 in. (21mm) or less on 5.2L engines, or 0.943 in (0.24mm) or less
      on 5.9L engines, then the inner rotor and shaft assembly must be

    2. Slide the outer rotor into the pump body, do this by pressing it
      to one side with your fingers and measure the clearance between the
      rotor and the pump body. If the measurement is 0.014 in (0.355mm) or
      more, replace the oil pump assembly. Install the inner rotor and shaft
      into the pump body. If the clearance between the inner and outer rotors
      is 0.010 in. (0.25mm) or more, replace the soft and both rotors.

    3. Place a straightedge across the face of he pump, between the bolt
      holes. If a feeler gauge of 0.004 in. (0.10mm) or more can be inserted
      between the rotors and the straightedge, replace the pump assembly.

    4. 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.

    5. The relief valve spring has a free length of 2
      in. (51.5-52.0mm) and should test between 16.2 and 17.2 lbs. (72-76 N) when compressed to 1
      in. (34mm). Replace the spring if it fails to meet this specification.

    Hope helps (remember rated and comment this).



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