Chrysler Full-Size Trucks 1997-2000 Repair Guide

Oil Pump

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REMOVAL & INSTALLATION



2.5L Engine
  1. Remove the oil pan.
  2.  
  3. Remove the two pump attaching bolts. Remove the pump and gasket.
  4.  


WARNING
If the pump is not to be serviced, do NOT disturb the position of the oil inlet tube and strainer assembly in the pump body. If the tube is moved within the pump body, a replacement tube and strainer assembly must be installed to ensure an airtight seal.

  1. Installation is the reverse of removal. Use a new gasket and tighten the pump attaching bolts to 17 ft. lbs. (23 Nm).
  2.  



Click image to see an enlarged view

Fig. Oil pump assembly-2.5L

3.9L, 5.2L, 5.9L Gasoline Engines
  1. Remove the oil pan.
  2.  
  3. Remove the oil pump from the rear main bearing cap.
  4.  

To install:

  1. Install while slowly rotating the pump body to ensure drive shaft engagement.
  2.  
  3. Use a new gasket.
  4.  
  5. Hold the pump base flush against the mating surface on the main bearing cap and tighten the bolts to 30 ft. lbs. (41 Nm).
  6.  



Click image to see an enlarged view

Fig. Exploded view of oil pump-3.9L, 5.2L, 5.9L gasoline engines

4.7L Engine
  1. Remove the oil pan and pickup tube.
  2.  
  3. Remove the timing chain cover.
  4.  
  5. Remove the timing chains and tensioners.
  6.  
  7. Remove the four bolts, primary timing chain tensioner and oil pump.
  8.  

To install:

  1. Position the oil pump onto the crankshaft and install two mounting bolts.
  2.  
  3. Position the primary timing chain tensioner and install the two retaining bolts.
  4.  
  5. Tighten the pump and tensioner retaining bolts to 21 ft. lbs. (28 Nm) in the sequence shown.
  6.  
  7. Install the secondary timing chain tensioners, chains, cover, pickup tube and oil pan.
  8.  



Click image to see an enlarged view

Fig. Oil pump and primary timing chain tensioner tightening sequence-4.7L

8.0L Engine
  1. Remove the timing chain cover.
  2.  
  3. Remove the mounting screws and the oil pump cover.
  4.  

To install:

  1. Lubricate all of the pump internals with petroleum jelly or Lubriplate®.
  2.  
  3. Install the pump and tighten the pump cover to 10 ft. lbs. (14 Nm).
  4.  
  5. Make sure that the inner ring moves freely after the cover is installed.
  6.  
  7. Install the timing chain cover.
  8.  
  9. Squirt oil into the relief valve hole until the oil runs out.
  10.  
  11. Install the relief valve and spring.
  12.  
  13. Using a new pressure relief valve gasket, install the relief valve plug. Tighten it to 15 ft. lbs. (20 Nm).
  14.  
  15. Remember to fill the filter with oil before installation.
  16.  



Click image to see an enlarged view

Fig. Oil pump rotors-8.0L engine

Diesel
  1. Disconnect the battery negative cables.
  2.  
  3. On 1997-99 models, remove the radiator.
  4.  
  5. Remove the oil fill tube, if necessary.
  6.  
  7. Remove the fan/drive assembly.
  8.  
  9. Remove the accessory drive belt.
  10.  
  11. Remove the fan support/hub assembly.
  12.  
  13. Remove the crankshaft damper.
  14.  
  15. Remove the gear cover-to-housing bolts and pry the cover away from the housing, taking care NOT to mar the gasket surface.
  16.  
  17. Remove the oil pump mounting bolts and remove the pump.
  18.  

To install:

  1. Fill the pump with clean engine oil.
  2.  
  3. Check that the idler gear pin is installed in the locating bore in the cylinder block.
  4.  
  5. Tighten the pump mounting bolts in two steps: first to 44 inch lbs. (5 Nm), and then to 18 ft. lbs. (24 Nm).
  6.  
  7. The back plate on the pump seats against the bottom of the bore in the cylinder block. When the pump is correctly installed, the flange on the pump will not touch the cylinder block.
  8.  
  9. Check the idler gear to pump drive gear backlash and the idler gear to crankshaft gear backlash. Replace the pump assembly if it exceeds 0.003-0.013 in. (0.080-0.330mm).
  10.  
  11. Tighten cover bolts to 18 ft. lbs. (24 Nm). Tighten vibration damper bolts to 92 ft. lbs. (125 Nm).
  12.  



Click image to see an enlarged view

Fig. Check backlash at each oil pump gear in turn-diesel

 
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