Chevrolet Full-size Cars 1968-1978 Repair Guide

Timing Gear Cover

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REMOVAL & INSTALLATION





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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 six-cylinder engine shown



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Fig. Fig. 2 Apply sealer to the two front oil pan pads at the area shown-V8 engines



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Fig. Fig. 3 Whenever the timing cover is being replaced on most engines, the front oil pan seal must be modified



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Fig. Fig. 4 Using the proper tool to install the harmonic balancer on the inline six-cylinder engine



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Fig. Fig. 5 Using the proper tool to install the harmonic balancer on V8 engines-never hammer on the balancer itself, as this can unbalance or damage it



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Fig. Fig. 6 After removing the water pump, loosen and remove the crankshaft pulley bolts and ...



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Fig. Fig. 7 ... remove the crankshaft pulley



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Fig. Fig. 8 Using a suitable puller, ...



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Fig. Fig. 9 ... remove the harmonic balancer from the engine



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Fig. Fig. 10 Loosen and remove the timing cover bolts ...



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Fig. Fig. 11 ... and pry out gently, ...



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Fig. Fig. 12 ... then remove the timing cover from the engine

Inline 6-Cylinder Engines
  1. Disconnect the negative battery cable. Drain the engine oil. Remove the oil pan on 1968-72 vehicles.
  2.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

an environmental tip. Used oil contains heavy metals, and has been determined to be hazardous to the environment. Recycling oil is the best way for disposal. Check local laws and recycle whenever possible.

  1. Drain the radiator. Remove the radiator from the vehicle.
  2.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. 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.
  2.  
  3. Remove the crankshaft pulley and damper. Use the puller tool No. J-16516 to remove the damper. do not attempt to pry or hammer the damper off, or it will be damaged.
  4.  
  5. Remove the retaining bolts, and remove the cover on 1968-72 vehicles.
  6.  
  7. On 1973-78 vehicles, 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.
  8.  
  9. On installation, coat the gasket with sealer and use a 1 / 8 " 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 using installation tool J-22197. Hammering it will destroy it.
  10.  

When installing the timing cover, place the centering tool J-23042 inside the oil seal, slide the timing cover into position, install 2 screws and remove the tool.

  1. Replace the oil pan if it was removed, and fill the crankcase with oil.
  2.  

V8 Engines
1968-74 VEHICLES
  1. Drain the oil and remove the oil pan. The pan need not be removed on 1974 and later small block engines.
  2.  


CAUTION
The EPA warns that prolonged contact with used engine oil may cause a number of skin disorders, including cancer! You should make every effort to minimize your exposure to used engine oil. Protective gloves should be worn when changing the oil. Wash your hands and any other exposed skin areas as soon as possible after exposure to used engine oil. Soap and water, or waterless hand cleaner should be used.

an environmental tip. Used oil contains heavy metals, and has been determined to be hazardous to the environment. Recycling oil is the best way for disposal. Check local laws and recycle whenever possible.

  1. Drain and remove the radiator.
  2.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. 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.
  2.  
  3. Remove the water pump. Remove the crankshaft pulley and damper. Use a puller on the damper. Do not attempt to pry or hammer the damper off.
  4.  
  5. Remove the retaining bolts, and remove the timing cover.
  6.  
  7. Installation is the reverse of the removal procedure. Be sure to use new gaskets or RTV sealant, as required.
  8.  
  9. Use a damper installation tool to pull the damper on. Apply an 1 / 8 " 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.
  10.  

1975-78 VEHICLES
  1. Disconnect the negative battery cable. Drain the cooling system.
  2.  


CAUTION
When draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.

  1. Remove the fan assembly, the drive belts and the fan pulley.
  2.  
  3. Raise and support the vehicle safely.
  4.  
  5. Remove the crankshaft pulley and the damper pulley bolt.
  6.  
  7. Using tool J-23523, remove the damper pulley.
  8.  
  9. Remove the alternator and the brackets. If equipped with power steering, remove the lower pump bracket and swing aside.
  10.  
  11. Remove the heater and the lower radiator hoses from the water pump.
  12.  
  13. Remove the water pump bolts and the pump from the engine.
  14.  
  15. Remove the timing cover bolts and the timing cover.
  16.  
  17. Using a gasket scraper, clean the gasket mounting surfaces.
  18.  

To install:

  1. Install the timing cover. Be sure to use a new gasket or RTV sealant, as required.
  2.  
  3. Install the water pump. Install the heater and the lower radiator hoses to the water pump.
  4.  
  5. Install the alternator and the brackets. If equipped with power steering, install the lower pump bracket. Using the proper tool install the damper pulley.
  6.  
  7. Install the crankshaft pulley and the damper pulley bolt.
  8.  
  9. Install the fan assembly, the drive belts and the fan pulley.
  10.  
  11. Install the negative battery cable. Refill the cooling system. Start the engine and check for leaks.
  12.  

 
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