GM Firebird 1982-1992 Repair Guide

Timing Chain and Gear Cover

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REMOVAL & INSTALLATION



4-Cylinder Engines

See Figures 1 and 2



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Fig. Fig. 1: Timing cover removal-2.5L



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Fig. Fig. 2: Apply sealer to these points prior to assembly

  1. Remove the drive belts. Remove the hub center bolt, then slide the hub and pulleys from the crankshaft.
  2.  

If only removing the oil seal, simply pry the oil seal from the front cover using a large screwdriver. Be careful not to distort the sheet metal timing gear cover.

  1. Remove the oil pan-to-front cover screws and the front cover-to-block screws. Pull the cover forward enough to permit the cutting of the oil pan front seal. Using a sharp knife, cut the seal close to the block at both corners.
  2.  
  3. Remove the front cover and clean any portion of old gasket from the sealing surfaces. Clean portions of the old gasket from the block.
  4.  

To install:
  1. Use a new front oil pan gasket, cut the tabs from the gasket. Replace the crankshaft oil seal.
  2.  
  3. Place RTV sealer in the corners of the new oil pan gasket and the new timing gear cover gasket.
  4.  
  5. Install the front cover and install the oil pan-to-front cover screws and the front cover-to-block screws. Torque screws to 90 inch lbs. (10 Nm).
  6.  
  7. Install the hub and pulleys onto the crankshaft. Install the hub center bolt and torque to 162 ft lbs. (220 Nm).
  8.  
  9. Install the drive belts and adjust.
  10.  

2.8L-3.1L and V8 Engines

See Figures 3 and 4



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Fig. Fig. 3: Damper removal-V8



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Fig. Fig. 4: Removing the timing cover bolts

  1. Disconnect the battery ground cable. Drain the cooling system.
  2.  
  3. Remove the fan shroud or the upper radiator support and drive belts. Remove the fan and pulley from the water pump.
  4.  
  5. Remove the alternator upper and lower brackets, air brace with brackets, and power steering lower bracket (move it aside).
  6.  
  7. Remove the radiator lower hose and the heater hose from the water pump. Remove the water pump bolts and the water pump.
  8.  
  9. If A/C equipped, remove the compressor and move aside. Remove the compressor mounting bracket.
  10.  
  11. Remove the damper pulley retaining bolt and the damper pulley.
  12.  
  13. Remove the timing gear cover bolts and the timing gear cover.
  14.  

With the timing gear cover removed, use a large screwdriver to pry the oil seal from the cover. To install the new oil seal, lubricate it with engine oil and drive it into place.

To install:
  1. Prepare the mating surfaces for reinstallation of the timing gear cover. Coat the new gasket with RTV sealer.
  2.  
  3. Install the timing gear cover and timing gear cover bolts. Torque the cover bolts to specifications:

    V6 engines (M8 x 1.25 bolts): 13-22 ft. lbs. (18-30 Nm)
     
    V6 engines (M10 x 1.5 bolts): 20-35 ft. lbs. (27-48 Nm)
     
    V8 engines (all bolts): 69-130 inch lbs. (8-14 Nm)
     

  4.  
  5. Install the damper pulley by pulling the damper onto the crankshaft. Use tool J-23523 or equivalent. Install the damper pulley retaining bolt and torque bolts to 67-85 ft lbs. (90-110 Nm).
  6.  
  7. If A/C equipped, install the compressor mounting bracket and compressor.
  8.  
  9. Install the water pump and the water pump bolts.
  10.  
  11. Install the radiator lower hose and the heater hose to the water pump.
  12.  
  13. Install the alternator upper and lower brackets, air brace with brackets and the power steering lower bracket.
  14.  
  15. Install the fan and pulley to the water pump. Install the fan shroud or the upper radiator support and drive belts and adjust.
  16.  
  17. Connect the battery ground cable.
  18.  
  19. Fill the cooling system, start the engine and check for leaks.
  20.  

3.8L Turbo Engine

See Figure 5

  1. Remove the oil cooler and adapter.
  2.  
  3. Remove the water pump.
  4.  
  5. Remove the radiator inlet hose from the intake manifold.
  6.  
  7. Remove the clamp on the coolant bypass hose.
  8.  
  9. Remove the crankshaft balancer.
  10.  
  11. Unplug the sensor electrical connectors.
  12.  
  13. Remove the oil pan-to-front cover bolts.
  14.  
  15. Remove the bolts attaching the front cover to the cylinder block.
  16.  
  17. Remove the crankshaft sensor.
  18.  

To install:
  1. Clean the gasket mating surfaces.
  2.  
  3. Remove the oil pump cover and pack the space around the pump gears completely with petroleum jelly. Reinstall the cover using a new gasket.
  4.  
  5. Install a new gasket to the front cover.
  6.  
  7. Install the crankshaft sensor.
  8.  
  9. Install the front cover to the cylinder block.
  10.  
  11. Coat the front cover bolts with sealer and tighten them to 22 ft lbs. (30 Nm).
  12.  
  13. Install the oil pan-to-front cover bolts and tighten to 89 inch lbs. (10 Nm).
  14.  
  15. Engage the sensor electrical connectors.
  16.  
  17. Install the crankshaft damper.
  18.  
  19. Install the front clamp on the coolant bypass hose.
  20.  
  21. Connect the radiator hose to the intake manifold.
  22.  
  23. Install the water pump.
  24.  
  25. Install the oil cooler and adapter.
  26.  
  27. Fill the cooling system.
  28.  
  29. Adjust the camshaft position sensor. Refer to Engine Performance & Tune-Up .
  30.  



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Fig. Fig. 5: Engine front cover on 3.8L engines

TIMING GEAR COVER OIL SEAL REPLACEMENT



See Figures 6 and 7



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Fig. Fig. 6: Installing the oil seal with the cover installed



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Fig. Fig. 7: Installing the oil seal with the cover removed

  1. After removing the gear cover, pry or drive the oil seal out of the cover with a small prybar or an oil seal removal tool.
  2.  
  3. Install a new lip seal with the lip (open side of seal) inside and drive or press the seal into place.
  4.  
  5. Lightly coat seal with engine oil before installing cover on block.
  6.  

 
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