Saturn Coupes/Sedans/Wagons 1991-1998 Repair Guide

Oil Pump

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The oil pump is located in a housing built into the lower portion of the timing chain/engine front cover. The pump may be serviced after the cover has been removed from the vehicle.

REMOVAL



See Figures 1 and 2

  1. Disconnect the negative battery cable and drain the engine oil.
  2.  
  3. Remove the timing chain front cover. See the procedure in this section.
  4.  
  5. Remove the oil pump cover Torx® bolts using a suitable impact driver. Because the pump cover screws are coated with a sealant to prevent oil leakage, they must be replaced when removed.
  6.  
  7. Remove the driven and drive rotors.
  8.  
  9. If necessary, remove the relief valve using regulator valve removal tool SA9103E or an equivalent puller, to withdraw the valve from the bore. Whenever the valve is removed, it must be replaced because the puller jaws will damage the valve sealing seat.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the oil pump assembly



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Fig. Fig. 2: Only use SA9103E or an equivalent puller to remove the relief valve, if replacement is necessary

INSPECTION



See Figures 3, 4 and 5

  1. With the timing chain front cover and the oil pump body cover removed, use a feeler gauge to measure the clearance between the driven rotor and pump body. Clearance should not exceed 0.011 in. (0.277mm).
  2.  
  3. Use a feeler gauge to measure the clearance between the both rotor tips. Clearance should not exceed 0.006 in. (0.150mm).
  4.  
  5. Using Plastigage® or a feeler gauge, temporarily install the pump cover and measure the rotor-to-cover clearance. Clearance should not exceed 0.005 in. (0.128mm).
  6.  
  7. If necessary, replace the pump components and/or the front cover assembly.
  8.  



Click image to see an enlarged view

Fig. Fig. 3: Use a feeler gauge to measure the clearance between the driven rotor and pump body



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Fig. Fig. 4: Use a feeler gauge to measure the clearance between both rotor tips



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Fig. Fig. 5: Temporarily install the pump cover and measure the rotor-to-cover clearance

INSTALLATION



See Figure 6

  1. If removed, install a new relief valve into the cover bore. Coat the valve with clean engine oil and tap it into the bore using a hammer and SA9103E or an equivalent installer tool.
  2.  

Whenever the oil pump is installed, the assembly must be packed with petroleum jelly in order to prime the pump.

  1. Install the driven and drive rotors into the pump with the chamfer toward the front oil seal.
  2.  
  3. Install the pump body cover and secure with new bolts which are covered with a sealant to prevent oil leakage. Tighten the bolts to 97 inch lbs. (11 Nm).
  4.  
  5. Install the timing chain front cover.
  6.  
  7. Properly fill the engine crankcase, start the engine and check for leaks.
  8.  



Click image to see an enlarged view

Fig. Fig. 6: Install a new pressure relief valve, using a hammer and suitable installation tool

 
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