GM Corvette 1984-1996 Repair Guide

Timing Chain Cover

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REMOVAL & INSTALLATION



5.7L (VIN 8) Engine

See Figure 1

  1. Disconnect the negative battery cable. Properly relieve the fuel system pressure.
  2.  
  3. Drain the engine cooling system and engine oil into suitable containers.
  4.  
  5. Remove the oil pan.
  6.  
  7. Remove the AIR pump pulley.
  8.  
  9. Remove the air management valve adapter.
  10.  
  11. Unfasten the AIR pump bolts, then remove the AIR pump.
  12.  
  13. Disconnect the fuel inlet and return lines from the TBI units. Plug the lines to avoid getting dirt or debris in the fuel system.
  14.  
  15. Remove the rear A/C compressor braces.
  16.  
  17. Remove the lower A/C compressor mounting bolt.
  18.  
  19. Remove the compressor bracket nuts from the water pump.
  20.  
  21. Slide the mounting bracket forward, then remove the compressor mounting bolt.
  22.  
  23. Detach the wires, then position the compressor aside. Do NOT disconnect the refrigerant lines!
  24.  
  25. Disconnect the AIR hose from the right exhaust manifold.
  26.  
  27. Remove the compressor mounting bracket.
  28.  
  29. Remove the upper AIR pump bracket with the power steering reservoir.
  30.  
  31. Remove the lower AIR pump bracket.
  32.  
  33. Disconnect the radiator and heater hoses from the water pump.
  34.  
  35. Remove the front cover bolts, then remove the front cover.
  36.  
  37. Thoroughly clean the gasket mating surfaces.
  38.  



Click image to see an enlarged view

Fig. Fig. 1: Exploded view of the timing chain cover-5.7L (VIN 8) engine shown

To install:
  1. Use a sharp knife or other suitable cutting tool to remove any excess oil pan gasket material that may be protruding at the oil-to-engine block junction.
  2.  
  3. Check the front cover for any damage or distortion, and replace if necessary. Apply a 1 / 8 in. (3mm) bead of RTV sealant to the joint formed at the oil pan and cylinder block. Coat the cover gasket with gasket sealant and position it on the cover.
  4.  
  5. Install the cover and loosely install the cover-to-block upper attaching bolts.
  6.  
  7. Tighten the bolts alternately and evenly while pressing downward on the cover so the dowels in the block align with their corresponding holes in the cover. You must position the cover so the dowels enter the holes in the cover without binding. Do not force the cover over the dowels and cause the cover flange or holes to be distorted.
  8.  
  9. Install the remaining cover bolts and tighten to 80 inch lbs. (9 Nm).
  10.  
  11. Install the oil pan.
  12.  
  13. Install the water pump and crankshaft damper.
  14.  
  15. The remainder of installation is the reverse of the removal procedure.
  16.  
  17. Fill the engine crankcase with the proper type and amount of oil.
  18.  
  19. Connect the negative battery cable, properly fill the engine cooling system and check for leaks.
  20.  
  21. Check the coolant and oil levels, and add if necessary.
  22.  

5.7L (VIN J) Engine

See Figure 2

  1. Take the vehicle to a reputable repair shop and have the A/C system properly discharged and recovered, using the proper tools.
  2.  
  3. Disconnect the negative battery cable and drain the engine coolant into a suitable container.
  4.  
  5. Remove the water pump assembly.
  6.  
  7. Remove the air conditioning compressor as follows:
    1. Remove the throttle body.
    2.  
    3. Remove the serpentine drive belt.
    4.  
    5. Remove the engine oil temperature sensor.
    6.  
    7. Remove the alternator.
    8.  
    9. Remove the refrigerant hose from the A/C compressor, then immediately cap or plug the openings to prevent system contamination and damage.
    10.  
    11. Remove the compressor mounting bolts and electrical connection.
    12.  
    13. Remove the compressor from the vehicle.
    14.  

  8.  
  9. Remove the steering gear for access to the damper.
  10.  
  11. Remove the bolt and washer attaching the torsional damper to the crankshaft.
  12.  
  13. Using tool J-24420-C, or an equivalent torsional damper puller, remove the damper from the crankshaft.
  14.  
  15. Remove the drift key, from the crankshaft.
  16.  
  17. Remove the nuts and/or bolts attaching the front cover to the engine.
  18.  
  19. Remove the front cover and gasket from the vehicle. If necessary, remove the old seal from the front cover using J-29077-A or an equivalent oil seal remover.
  20.  



Click image to see an enlarged view

Fig. Fig. 2: Exploded view of the front timing chain cover-5.7L (VIN J) engine

To install:
  1. Thoroughly clean the cylinder case, front cover and water pump sealing surfaces.
  2.  
  3. Apply Loctite® 262 to the stud threads and Loctite® 565 to the bolt threads.
  4.  
  5. Install a new cover gasket and the cover, nuts and bolts.
  6.  
  7. If removed, install a new front cover oil seal using J-37309 or equivalent front cover seal installer.
  8.  
  9. Tighten the front cover attaching bolts to 19 inch lbs. (26 Nm) and the stud nuts to 21 ft. lbs. (28 Nm).
  10.  
  11. Install the water pump assembly.
  12.  
  13. Install the air conditioning compressor in the reverse order of the removal procedure. Replace the refrigerant line seal washers and coat the new washers with 525 refrigerant oil prior to assembly.
  14.  
  15. Install the key to the crankshaft and, then install the torsional damper using J-38463, or an equivalent torsional damper installer. Check for proper key seating during installation.
  16.  

If a new balancer is installed, new balancer weights of the same size must be installed in the same hole locations as the original balancer.

  1. Remove the tool apply Loctite® 262 to the damper bolt threads. Install the washer and damper bolt, then tighten the bolt to 148 ft. lbs. (200 Nm).
  2.  
  3. Install the serpentine drive belt.
  4.  
  5. Install the steering gear.
  6.  
  7. Connect the negative battery cable, properly fill the engine cooling system and check for leaks.
  8.  
  9. If the engine oil was changed, and if equipped, reset the CHANGE OIL indicator, as outlined in General Information & Maintenance of this repair guide.
  10.  
  11. Take the vehicle to a reputable repair shop to have the A/C system properly evacuated and charged.
  12.  

5.7L (VIN P and 5) Engines

See Figure 3

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the engine oil and coolant into suitable containers.
  4.  
  5. Remove the throttle body air intake duct.
  6.  
  7. Remove the serpentine drive belt.
  8.  
  9. Remove the water pump assembly.
  10.  
  11. Remove the crankshaft balancer and hub.
    1. If not done already, raise and support the vehicle safely, then remove the motor mount nuts.
    2.  
    3. Remove the power steering fluid cooler, then raise the engine sufficiently for tool access to the crankshaft balancer.
    4.  

  12.  


WARNING
When raising and supporting the engine, NEVER place a jack under the oil pan, crankshaft pulley or any sheetmetal. There is a minimal clearance between the oil pan and the pump screen. Jacking against the pan could cause sufficient deformation to damage the oil pickup unit.

  1. Remove the balancer bolts, then remove the balancer from the hub.
  2.  
  3. Disconnect the power steering line from the steering gear.
  4.  
  5. Matchmark the crankshaft hub to the engine front cover, then remove the hub bolt and washer.
  6.  
  7. Remove the crankshaft hub using J-39046, or an equivalent hub removal/installation tool. To preserve the relationship between the hub and crankshaft, DO NOT crank the engine over once the hub has been removed. If the hub is not matchmarked and installed in the original position, an engine imbalance could result.
  8.  

  1. Remove the distributor assembly.
  2.  
  3. Remove the oil pan assembly.
  4.  
  5. Remove the engine front cover bolts.
  6.  
  7. Remove the engine front cover and gasket.
  8.  



Click image to see an enlarged view

Fig. Fig. 3: Exploded view of the front cover and gasket-5.7 (VIN P and 5) engines

To install:
  1. Thoroughly clean the engine front cover and cylinder block gasket mating surfaces. Inspect the engine front cover and seals for damage, replace as necessary.
  2.  
  3. Using J-39087 or equivalent shaft gear front cover seal protector, on the water pump driveshaft, install the gasket and front cover into position over the shafts and guide pins.
  4.  
  5. Install the engine front cover bolts and tighten to 100 inch lbs. (11 Nm).
  6.  
  7. Install the oil pan and gasket.
  8.  
  9. Install the distributor assembly.
  10.  
  11. Install the and the torsional damper.
    1. Align the matchmarks made earlier and install the crankshaft hub. If the engine was cranked and the matchmarks were lost, set the engine to No. 1 TDC, then install the crankshaft hub with the cast arrow in the 12 o'clock position.
    2.  
    3. Install the hub washer and bolt, but do not torque at this time.
    4.  
    5. Raise the engine, as necessary for access, then install the crankshaft balancer assembly. Tighten the crankshaft hub bolt to 75 ft. lbs. (102 Nm) and the balancer bolts to 60 ft. lbs. (81 Nm).
    6.  

  12.  

If a new balancer is installed, new balancer weights of the same size must be installed in the same hole locations as the original balancer.

  1. Install the power steering line to the gear, then lower the engine into position.
  2.  
  3. Install the power steering fluid cooler.
  4.  
  5. Install the motor mount nuts and tighten to 40 ft. lbs. (50 Nm).
  6.  

  1. Install the water pump assembly.
  2.  
  3. Install the serpentine drive belt and the throttle body air duct.
  4.  
  5. Properly fill the engine crankcase with oil.
  6.  
  7. Tighten the fuel filler cap and properly fill the engine cooling system.
  8.  
  9. Connect the negative battery cable, operate the engine and check for leaks.
  10.  
  11. Bleed the power steering hydraulic system, as necessary.
  12.  
  13. If equipped, reset the CHANGE OIL indicator, as outlined in General Information & Maintenance of this repair guide.
  14.  

 
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