Toyota Prius 2002-06

Oil Pump

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Inspection



  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the oil pump from the engine and disassemble it.
  4.  
  5. Coat the relief valve with engine oil and check that it falls smoothly into the valve hole by its own weight.
  6.  
  7. If it doesn-t, replace the relief valve. If necessary, replace the oil pump assembly.

    Click image to see an enlarged view

    Fig. Relief valve inspection

  8.  
  9. Place the drive and driven rotors into the oil pump body.
  10.  
  11. Using a feeler gauge, measure the clearance between the drive and driven rotor tips.
  12.  
  13. Standard tip clearance is 0.060 to 0.180 mm (0.0024 to 0.0071 in.). Maximum clearance is 0.425 mm (0.0167 in.).
  14.  
  15. If the tip clearance is greater than maximum, replace the rotors as a set.

    Click image to see an enlarged view

    Fig. Measuring rotor tip clearance

  16.  
  17. Using a feeler gauge and precision straight edge, measure the clearance between the rotors and precision straight edge.
  18.  
  19. Standard side clearance is 0.030 to 0.090 mm (0.0012 to 0.0035 in.).
  20.  
  21. If the side clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

    Click image to see an enlarged view

    Fig. Measuring side clearance

  22.  
  23. Using a feeler gauge, measure the clearance between the driven rotor and body.
  24.  
  25. Standard body clearance is 0.250 to 0.325 mm (0.0098 to 0.0128 in.). Maximum clearance is 0.425 mm (0.0167 in).
  26.  
  27. If the body clearance is greater than maximum, replace the rotors as a set. If necessary, replace the oil pump assembly.

    Click image to see an enlarged view

    Fig. Measuring body clearance

  28.  

Removal & Installation





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Fig. Exploded view of the oil pump assembly-1.5L hybrid engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable. Wait at least 90 seconds after disconnecting the negative battery cable to prevent possible airbag and seat belt pretensioner activation.
  4.  
  5. Drain the engine oil.
  6.  
  7. Remove the timing chain cover (refer to the timing chain procedure).
  8.  
  9. Remove the 2 bolts, 3 screws and oil pump cover from the timing chain cover.
  10.  
  11. Remove the drive and driven rotors.
  12.  
  13. Remove the plug, spring and relief valve.
  14.  

To install:

  1. Insert the relief valve and spring into the pump body hole, and install the plug. Torque the plug to 18 ft. lbs. (25 Nm).

    Click image to see an enlarged view

    Fig. Install the rotors into timing chain cover with the marks facing the oil pump cover side-1.5L hybrid engine

  2.  
  3. Place the drive and driven rotors into timing chain cover with the marks facing the oil pump cover side.
  4.  
  5. Install the oil pump cover to the timing chain cover with the 2 bolts and 3 screws. Torque the bolts to 78 inch lbs. (8.8 Nm), and the screws to 8 ft. lbs. (10.3 Nm).
  6.  
  7. Install the timing chain cover (refer to the timing chain procedure).
  8.  
  9. Refill engine with engine oil.
  10.  
  11. Connect the negative battery cable.
  12.  
  13. Start the engine and check the engine oil pressure.
  14.  
  15. Check that no leaks are present.
  16.  

 
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