GM Camaro 1967-1981 Repair Guide

Timing Chain or Gear Cover

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REMOVAL & INSTALLATION



230 and 250 cid Engines

See Figure 1



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Fig. Fig. 1: Use sealer at the timing cover-to-oil pan and the oil pan-to-cylinder block joints-inline 6-cylinder engine shown

  1. Drain the oil and remove the oil pan on models through 1972.
  2.  
  3. Remove the radiator after draining it.
  4.  
  5. Remove the fan, pulley, and belt. Remove any power steering and/or AIR pump drive belts. Remove any braces for the above pumps which will interfere with cover removal, and position the pumps out of the way.
  6.  
  7. Remove the crankshaft pulley and damper. Use a puller to remove the damper. Do not attempt to pry or hammer the damper off, or it will be damaged.
  8.  
  9. Remove the retaining bolts, and remove the cover on 1968-72 models.
  10.  
  11. On 1973-79 models, pull the cover forward slightly and cut the oil pan front seal off flush with the block. Remove the cover. On installation, cut the tabs off a new oil pan front seal and install it on the cover.
  12.  

To install:
  1. Coat the gasket with sealer and use a 1 / 8 in. bead of silicone sealer at the oil pan-to-cylinder block joint. Replace the damper before tightening the cover bolts down, so that the cover seal will align. The damper must be drawn into place. Hammering it will destroy it.
  2.  
  3. Replace the oil pan, if it was removed, and fill the crankcase with oil.
  4.  

Except 230, 231 and 250 cid Engines

See Figures 2 through 13



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Fig. Fig. 2: When removing the front cover without first removing the oil pan, cut the pan seal flush with the front of the engine block



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Fig. Fig. 3: When the front cover was removed without also removing the oil pan, the oil pan front seal must be modified as shown prior to installation



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Fig. Fig. 4: During installation, apply sealer to the front pads-V8 engine shown



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Fig. Fig. 5: When removing the front pulley and damper, position the engine at TDC on No. 1 cylinder's compression stroke-many engine procedures require the engine to be in this position



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Fig. Fig. 6: Remove the front pulley-to-damper bolts ...



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Fig. Fig. 7: ... then pull the front pulley off of the damper



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Fig. Fig. 8: Use a damper puller to remove the damper from the crankshaft-note that if a flywheel holding tool is not available, a prybar can prevent the crankshaft from rotating



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Fig. Fig. 9: Lift the damper, with the puller attached, off of the crankshaft



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Fig. Fig. 10: Remove the front cover mounting bolts ...



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Fig. Fig. 11: ... carefully pry the front cover loose from the engine ...



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Fig. Fig. 12: ... and remove the front cover, exposing the timing chain and gears



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Fig. Fig. 13: Make certain not to lose the crankshaft key-it will be needed during installation

REMOVAL
  1. Drain the oil and remove the oil pan. The pan need not be removed on 1974 and later small block engines.
  2.  
  3. Drain and remove the radiator.
  4.  
  5. Remove the fan, pulley, and belt. Remove any power steering and/or AIR pump drive belts. Remove any braces for these pumps which will interfere with cover removal, and position the pumps out of the way.
  6.  
  7. Remove the water pump.
  8.  
  9. Remove the crankshaft pulley and damper. Use a puller on the damper. Do not attempt to pry or hammer the damper off.
  10.  
  11. Remove the retaining bolts, and remove the timing cover.
  12.  

INSTALLATION-1967-74 ENGINES

Reverse the preceding steps to install the cover. Use a damper installation tool to pull the damper on. Apply an 1 / 8 in. bead of silicone rubber sealer to the oil pan and cylinder block joint faces. Lightly coat the bottom of the seal with engine oil.

Refill the engine with oil.

INSTALLATION-1975-81 ENGINES
  1. Clean the gasket mating surfaces.
  2.  
  3. Remove any oil pan gasket material that may still be adhering to the oil pan-engine block joint face.
  4.  
  5. Apply a 1 / 8 in. bead of silicone sealant (Part No. 1051435) or the equivalent to the joint formed by the oil pan and cylinder block, as well as to the entire oil pan front lip.
  6.  
  7. Coat the cover gasket with gasket sealer and place it in position on the front cover.
  8.  
  9. Loosely install the front cover on the block. Install the 4 top bolts loosely (about 3 turns). Install two 1 / 41 / 2 in. screws in the hole at each side of the front cover and apply a bead of sealant on the bottom of the seal and install it on the cover.
  10.  
  11. Tighten the screws evenly while aligning the dowel pins and holes in the front cover.
  12.  
  13. Remove the 1 / 4 -20X 1 / 2 in. screws and install the rest of the cover screws.
  14.  
  15. Further installation is the reverse of removal. Refill the engine with oil.
  16.  

231 cid Engine
  1. Drain the cooling system. Remove the radiator hoses. Remove the radiator
  2.  
  3. Remove all the drive belts. Remove the fan and fan pulley. Remove the bypass hose.
  4.  
  5. Remove the crank pulley, the fuel pump and the distributor. Note the position of the distributor rotor before you remove the distributor
  6.  
  7. Remove the alternator and its bracket.
  8.  
  9. Remove the harmonic balancer. You'll need a puller.
  10.  
  11. Remove the two bolts which attach the oil pan to the front cover. Remove the bolts which attach the cover to the block.
  12.  
  13. Remove the cover and remove the gasket material.
  14.  

To install:
  1. It is first necessary to remove the oil pump cover and pack the space around the oil pump gears completely full of petroleum jelly. [cf2]Do not use gear lube. There must be no air space left inside the pump. Reinstall the pump cover using a new gasket. This step is very important since the oil pump may lose its prime any time the pump, pump cover or timing cover is disturbed. If the pump is not packed, it may not begin to pump oil as soon as the engine is started.
  2.  
  3. Install the cover, using a sealer and new gaskets. Make sure the dowel pins engage the dowel pin holes before starting the bolts. Apply sealer to the bolt threads.
  4.  
  5. Install the harmonic balancer, bolt and washer. It will be necessary to lock the flywheel in some way to tighten the balancer bolt to specifications. Most mechanics remove the flywheel cover and lock the flywheel with a bolt-on or hand-held locking device.
  6.  
  7. The rest of the installation is in the reverse order of removal.
  8.  

TIMING CHAIN OR GEAR COVER OIL SEAL REPLACEMENT



All Engines

See Figures 14 and 15



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Fig. Fig. 14: When the cover is removed from the engine, place it on a sturdy, clean work surface and install the new oil seal



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Fig. Fig. 15: The oil seal can, however, also be installed while the front cover is mounted on the engine, as shown

  1. After removing the chain or gear cover, pry the oil seal out of the front 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 the seal with engine oil before replacing the cover on block.
  6.  

 
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