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DISASSEMBLY Dodge Pickup R1500

3.7l Engine - Overhaul 6 illustrations ~396 words

DISASSEMBLY

  1. Remove oil pump cover screws and lift off cover plate.
  2. Remove pump inner and outer rotors. NOTE: Once the oil pressure relief valve, cup plug, and pin are removed, the pump assembly must be replaced.
  3. If it is necessary to remove the pressure relief valve, drive the roll pin from pump housing and remove cup plug, spring and valve.
CAUTIONOil 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.

Scheme 131

Scheme 131
Scheme 131

Scheme 132

Scheme 132
Scheme 132

Scheme 133

Scheme 133
Scheme 133

Scheme 134

Scheme 134
Scheme 134

Scheme 135

Scheme 135
Scheme 135

Scheme 136

Scheme 136
Scheme 136
  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. (Scheme 132) 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. (Scheme 133) 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. (Scheme 134) 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. (Scheme 135) If the measurement is 0.235 mm (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. (Scheme 136) 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. (Scheme 137)

Note. The 4.7 Oil pump is released as an assembly. There are no Daimler-Chrysler 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.