Saturn Coupes/Sedans/Wagons 1991-1998 Repair Guide

Oil Pump

Imprimir

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



Click image to see an enlarged view

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 th