MonteCarlo 2000

Oil Pump

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Inspection




NOTE
The oil pump is responsible for providing constant lubrication to the whole engine and so it is recommended that a new oil pump be installed when rebuilding the engine.

Completely disassemble the oil pump and thoroughly clean all of the components. Inspect the oil pump gears and housing for wear and/or damage. Insure that the pressure relief valve operates properly and there is no binding or sticking due to varnish or debris. If all of the parts are in proper working condition, lubricate the gears and relief valve, and assemble the pump.

Removal & Installation



3.1L & 3.4L Engines

Specific to:

Buick Century 1997-2000

Buick Regal 1997-2000

Chevrolet Lumina 1997-2000

Chevrolet Monte Carlo 1997-2000

Oldsmobile Cutlass Supreme 1997

Oldsmobile Intrigue 1998-2000

Pontiac Grand Prix 1997-2000


NOTE
The oil pump is located in the oil pan.

  1. Remove the oil pan using the procedure found in this section.
  2.  
  3. Some engines, such as the may have a crankshaft oil deflector (also called a "windage tray"). Remove the retaining nuts and remove the oil deflector.
  4.  
  5. Remove the bolt attaching the oil pump to the rear crankshaft bearing cap.
  6.  
  7. Remove the oil pump and driveshaft.
  8.  



Click image to see an enlarged view

Fig. Oil pump arrangement-3.1L and 3.4L engines

To install:

  1. Clean all parts well. Inspect the driveshaft at both ends for rounding of the corners. Replace, if necessary. If the original pump is being considered for reuse, inspect the pump body and the pump cover for cracks, scoring, casting imperfections, or any obvious damage.
  2.  
  3. Rotate the pump driveshaft as necessary to engage the with the oil pump. Make sure it turns smoothly. Some technicians will fill the oil pump through the opening next to the driveshaft to shorten the time it take the engine to buildup oil pressure on initial startup after an oil pump replacement. Turning the driveshaft as oil is being added fills the pump cavity.
  4.  
  5. Install the pump and driveshaft assembly to the engine. Install the retaining bolt and tighten to:
    1. 3.1L engines: 30 ft. lbs. (41 Nm)
    2.  
    3. 3.4L engines: 40 ft. lbs. (54 Nm)
    4.  

  6.  
  7. Install the oil pan using the procedure found in this section.
  8.  

3.8L Engine

Specific to:

Buick Century 1997-2000

Buick Regal 1997-2000

Chevrolet Lumina 1997-2000

Chevrolet Monte Carlo 1997-2000

Oldsmobile Cutlass Supreme 1997

Oldsmobile Intrigue 1998-2000

Pontiac Grand Prix 1997-2000


NOTE
The oil pump is located inside the engine front cover.


WARNING
When troubleshooting a low oil pressure complaint, another possibility is a clogged screen on the oil pickup pipe, damaged pipe or gasket. The oil pan will have to be removed to check this. Running the engine without measurable oil pressure will cause extensive and expensive damage.

  1. Remove the engine front cover using the procedure found in this section.
  2.  
  3. Remove the oil pump cover attaching screws and remove the cover.
  4.  
  5. Remove the oil pump gears.
  6.  
  7. If desired, remove the oil filter adapter and remove the pressure regulator valve and the spring for cleaning.
  8.  



Click image to see an enlarged view

Fig. Oil pump and engine front cover arrangement-3.8L engines

To install:

  1. Clean all parts well.
  2.  
  3. Lubricate the gears with petroleum jelly, packing all the spaces around the gears, filling the pump cavity. This is important. The petroleum jelly seals the pump cavity to help "prime" the pump. The reduces the time the engine will run with little oil pressure on initial start up after oil pump installation. DO NOT use chassis grease. Petroleum jelly melts at a low temperature and will "go away" as the engine warms.
  4.  
  5. If the oil pressure relief valve was removed, inspect the valve and bore for burrs. Check the spring for loss of tension. Replace the spring if in doubt.
  6.  
  7. Install the pump cover and tighten the screws evenly to 98 inch lbs. (11 Nm).
  8.  
  9. If removed, thoroughly clean the oil pressure relief valve of all varnish and install the spring first, the valve. Use a new oil filter adapter gasket. Install the adapter. Tighten the oil filter adapter bolts evenly to 22 ft. lbs. (30 Nm).
  10.  
  11. Install the engine front cover using the procedures found in this section.
  12.  

 
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