Pontiac Fiero 1984-1988 Repair Guide

Force Balancer Assembly

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Fig. Fig. 1 Exploded view of the force balancer/oil pump assembly-1987-88 2.5L engine

The 1987-88 2.5L engine uses a force balancer assembly that is driven directly from the crankshaft. Two eccentrically weighted shafts and gears are counter rotated by a concentric gear on the crankshaft at twice the crankshaft speed. The balancer helps dampen engine vibration and includes a sump pick-up screen, a gerotor-type oil pump and an oil filter. The filter is serviced through an opening in the bottom of the oil pan.

REMOVAL & INSTALLATION





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Fig. Fig. 2 Exploded view of the force balancer/oil filter assembly and location-1987-88 2.5L engine



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Fig. Fig. 3 Force balancer adjustments and counterweight locations-1987-88 2.5L engine

  1. Disconnect the negative (-) battery cable.
  2.  
  3. Drain the engine oil and remove the oil filter assembly.
  4.  
  5. Remove the oil pan assembly as outlined in the Oil Pan removal procedures in this section.
  6.  
  7. Remove the four force balancer attaching bolts and remove the balancer assembly. Refer to the force balancer illustrations in this section.
  8.  
  9. Before installation, perform the following procedures:
  10.  
    1. Rotate the engine to Top Dead Center (TDC) on the No. 1 and No. 4 cylinders.
    2.  
    3. Measure from the block to the first cut of the double notch on the reluctor ring as shown in the Force Balancer Adjustments illustration in this section.
    4.  
    5. The dimension should be 43mm.
    6.  
    7. Mount the force balancer with the counterweights parallel and pointing away from the crankshaft. Do not move the crankshaft.
    8.  

  11. Install the oil pan assembly as outlined in the Oil Pan installation procedures in this section.
  12.  
  13. Refill the crankcase with the specified engine oil. Start the engine and check for oil leaks.
  14.  

 
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