GM Lumina/Grand Prix/Cutlass Supreme/Regal 1988-1996

Camshaft

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REMOVAL & INSTALLATION



2.2L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine from the vehicle, as outlined earlier in this information, then mount it on a suitable stand.
  4.  
  5. Remove the rocker arms and pushrods, as outlined earlier in this information.
  6.  
  7. Remove the valve lifters.
  8.  
  9. Remove the crankcase front cover.
  10.  
  11. Remove the camshaft sprocket, timing chain and tensioner.
  12.  
  13. Remove the oil pump drive.
  14.  
  15. Remove the camshaft thrust plate.
  16.  


WARNING
Care must be taken to avoid damaging the camshaft bearings with the cam when withdrawing the camshaft.

  1. Carefully remove the camshaft.
  2.  

To install:
  1. Coat the camshaft lobes and bearings with a suitable lubricant. Insert the camshaft with extreme care to avoid personal injury and gouging of the camshaft bearings.
  2.  
  3. Install the thrust plate, then tighten the retaining bolts to 106 inch lbs. (12 Nm).
  4.  
  5. Install the timing chain and sprockets.
  6.  
  7. Install the remaining components in the reverse order of removal.
  8.  
  9. Install the engine in the vehicle, as outlined earlier in this information.
  10.  

2.3L Engine

See Figures 1, 2 and 3



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Fig. Fig. 1: Camshaft housing, cover and gasket removal-2.3L engine



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Fig. Fig. 2: Camshaft housing-to-cover seals-2.3L engine



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Fig. Fig. 3: Camshaft housing bolt tightening sequence-2.3L engine

INTAKE CAMSHAFT

Any time the camshaft housing to cylinder head bolts are loosened or removed, the camshaft housing to cylinder head gasket must be replaced.

  1. Relieve the fuel system pressure, as outlined in Fuel System . Disconnect the negative battery cable.
  2.  
  3. Label and detach the ignition coil and module assembly electrical connections.
  4.  
  5. Remove the ignition coil and module assembly-to-camshaft housing bolts and remove the assembly by pulling it straight up. Use tool J 36011, or equivalent spark plug boot wire remover tool, to remove the connector assemblies if they have stuck to the spark plugs.
  6.  
  7. Remove the idle speed power steering pressure switch connector.
  8.  
  9. Loosen the 3 power steering pump pivot bolts and remove drive belt.
  10.  
  11. Disconnect the 2 rear power steering pump bracket-to-transaxle bolts.
  12.  
  13. Remove the front power steering pump bracket-to-cylinder block bolt.
  14.  
  15. Unbolt the power steering pump assembly and position to the side. Do NOT disconnect the fluid lines.
  16.  
  17. Using the special tool, remove the power steering pump drive pulley from the intake camshaft.
  18.  
  19. Remove oil/air separator bolts and hoses. Leave the hoses attached to the separator, disconnect from the oil fill, chain housing and intake manifold. Remove as an assembly.
  20.  
  21. Detach the vacuum line from the fuel pressure regulator and disconnect the fuel injector harness connector.
  22.  
  23. Disconnect the fuel line retaining clamp from bracket on top of intake camshaft housing.
  24.  
  25. Remove the fuel rail-to-camshaft housing retaining bolts.
  26.  
  27. Remove the fuel rail from the cylinder head. Cover injector openings in cylinder head and cover injector nozzles. Leave the fuel lines attached and position fuel rail aside.
  28.  
  29. Disconnect the timing chain and housing but do not remove from the engine.
  30.  
  31. Remove intake camshaft housing cover-to-camshaft housing retaining bolts.
  32.  
  33. Remove the intake camshaft housing-to-cylinder head retaining bolts, using the reverse of the tightening sequence. Leave 2 bolts loosely in place to hold the camshaft housing while separating camshaft cover from housing.
  34.  
  35. Push the cover OFF the housing by threading 4 of the housing to head retaining bolts into the tapped holes in the cam housing cover. Tighten the bolts in evenly so the cover does not bind on the dowel pins.
  36.  
  37. Remove the 2 loosely installed camshaft housing to head bolts and remove the cover. Discard the gaskets.
  38.  
  39. Note the position of the chain sprocket dowel pin for reassembly. Carefully remove the camshaft; do not damage the camshaft oil seal.
  40.  
  41. Remove intake camshaft oil seal from camshaft and discard seal. This seal must be replaced any time the housing and cover are separated.
  42.  
  43. Remove the camshaft carrier from the cylinder head and remove the gasket. Discard the gasket.
  44.  

To install:
  1. Thoroughly clean the mating surfaces of the camshaft carrier and the cylinder head, bolts and bolt holes. Install a new gasket and place the housing on the head. Install 1 bolt loosely to hold in place.
  2.  
  3. Install the lifters into their bores. If the camshaft is being replaced, the lifters must also be replaced. Lubricate camshaft lobes, journals and lifters with camshaft and lifter prelube. The camshaft lobes and journals must be adequately lubricated or engine damage could occur upon start up.
  4.  
  5. Install the camshaft in the same position as when removed. The timing chain sprocket dowel pin should be straight up and line up with the centerline of the lifter bores.
  6.  
  7. Install new camshaft housing to camshaft housing cover seals into cover; do not use sealer. Make sure the correct color seal is placed in each groove. Install the cover to the housing.
  8.  
  9. Apply a suitable thread locking compound to the camshaft housing and cover retaining bolt threads.
  10.  
  11. Install the bolts and tighten to 11 ft. lbs. (15 Nm). Rotate the bolts (except the 2 rear bolts that hold fuel pipe to camshaft housing) an additional 75ºin sequence. Rotate the 2 rear bolts an additional 25º.
  12.  
  13. Install the timing chain housing and timing chain.
  14.  
  15. Uncover fuel injectors, then install new fuel injector ring seals lubricated with oil. Install the fuel rail.
  16.  
  17. Install the fuel line retaining clamp and retainer to bracket on top of the intake camshaft housing.
  18.  
  19. Connect the vacuum line to the fuel pressure regulator.
  20.  
  21. Attach the fuel injector harness connectors.
  22.  
  23. Install the oil/air separator assembly.
  24.  
  25. Lubricate the inner sealing surface of the intake camshaft seal with oil and install the seal to the housing.
  26.  
  27. Install the power steering pump pulley onto the intake camshaft.
  28.  
  29. Install the power steering pump assembly and drive belt.
  30.  
  31. Attach the idle speed power steering pressure switch connector.
  32.  
  33. Clean any loose lubricant that is present on the ignition coil and module assembly to camshaft housing bolts. Apply Loctite®592 or equivalent, onto the ignition coil and module assembly to camshaft housing bolts. Install the bolts and tighten to 13 ft. lbs. (18 Nm)
  34.  
  35. Attach the electrical connectors to ignition coil and module assembly.
  36.  
  37. Connect the negative battery cable and road test the vehicle. Check for leaks.
  38.  

EXHAUST CAMSHAFT

Any time the camshaft housing to cylinder head bolts are loosened or removed the camshaft housing to cylinder head gasket must be replaced.

  1. Relieve the fuel system pressure, as outlined in Fuel System . Disconnect the negative battery cable.
  2.  
  3. Label and detach the ignition coil and module assembly electrical connections.
  4.  
  5. Remove the ignition coil and module assembly-to-camshaft housing bolts and remove the assembly by pulling it straight up. Use tool J 36011, or equivalent spark plug boot wire remover tool, to remove connector assemblies if they have stuck to the spark plugs.
  6.  
  7. Remove the idle speed power steering pressure switch connector.
  8.  
  9. Remove the transaxle fluid level indicator tube assembly from exhaust camshaft cover and position aside.
  10.  
  11. Remove the exhaust camshaft cover and gasket.
  12.  
  13. Disconnect the timing chain and housing but do not remove from the engine.
  14.  
  15. Remove the exhaust camshaft housing-to-cylinder head bolts using the reverse of the tightening sequence.
  16.  
  17. Push the cover OFF the housing by threading 4 of the housing to head retaining bolts into the tapped holes in the camshaft cover. Tighten the bolts evenly so the cover does not bind on the dowel pins.
  18.  
  19. Remove the 2 loosely installed camshaft housing to cylinder head bolts and remove cover, discard gaskets.
  20.  
  21. Loosely install 1 camshaft housing to cylinder head bolt to retain the housing during camshaft and lifter removal.
  22.  
  23. Note the position of the chain sprocket dowel pin for reassembly. Remove camshaft being careful not to damage the camshaft or journals.
  24.  
  25. Remove the camshaft carrier from the cylinder head and remove and discard the gasket.
  26.  

To install:
  1. Thoroughly clean the mating surfaces of the camshaft carrier and the cylinder head, bolts and bolt holes. Install a new gasket and place the housing on the head. Install 1 bolt loosely to hold the assembly in place.
  2.  
  3. Install the lifters into their bores. If the camshaft is being replaced, the lifters must also be replaced. Lubricate camshaft lobes, journals and lifters with camshaft and lifter prelube. The camshaft lobes and journals must be adequately lubricated or engine damage could occur upon start up.
  4.  
  5. Install camshaft in same position as when removed. The timing chain sprocket dowel pin should be straight up and align with the centerline of the lifter bores.
  6.  
  7. Install new camshaft housing-to-camshaft housing cover seals into the cover; do not use sealer. Make sure the correct color seal is placed in each groove. Install the cover to the housing.
  8.  
  9. Apply a suitable thread locking compound to the camshaft housing and cover retaining bolt threads.
  10.  
  11. Install the retaining bolts and tighten in sequence to 11 ft. lbs. (15 Nm). Rotate the bolts an additional 75º, in sequence.
  12.  
  13. Install the timing chain housing and timing chain.
  14.  
  15. Install the transaxle fluid level indicator tube assembly to exhaust camshaft cover.
  16.  
  17. Attach the idle speed power steering pressure switch connector.
  18.  
  19. Clean any loose lubricant that is present on the ignition coil and module assembly to camshaft housing bolts. Apply Loctite®592 or equivalent, onto the ignition coil and module assembly to camshaft housing bolts. Install the bolts and tighten to 13 ft. lbs. (18 Nm)
  20.  
  21. Attach the electrical connectors to ignition coil and module assembly.
  22.  
  23. Connect the negative battery cable and road test the vehicle. Check for leaks.
  24.  

2.5L Engine

For the removal of the camshaft, the engine assembly must be removed from the vehicle.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine assembly from the vehicle, as outlined earlier in this information.
  4.  
  5. Remove the rocker arm cover and pushrods.
  6.  
  7. Remove the pushrod cover and valve lifters.
  8.  
  9. Remove the serpentine belt, crankshaft pulleys and vibration dampener.
  10.  
  11. Remove the front cover.
  12.  
  13. Unfasten the camshaft thrust plate screws.
  14.  

The camshaft journals are the same diameter. Care must be taken when removing the camshaft to avoid damage to the cam bearings.

  1. Carefully slide the camshaft and gear through the front of the block.
  2.  
  3. To remove the camshaft gear, use a arbor press and adapter.
  4.  
  5. Old and new camshafts should be cleaned with solvent and compressed air before being installed.
  6.  

To install:
  1. Install the camshaft gear onto the camshaft with an arbor press.
  2.  
  3. Measure the end clearnce with a feeler guage between the cam journal and thrust plate. The measurement should be between 0.0015-0.0050 in. (0.038-0.127mm). If the measurement is less than 0.0015 in. (0.127mm), replace the spacer ring. If the measurement is more than 0.0050 in. (0.038mm), replace the thrust plate.
  4.  

Always apply assembly lube, GM Engine Oil Supplement (E.O.S) or equivalent, to the cam journals and lobes. If this procedures is not done, cam damage may result.

  1. Carefully install the camshaft into the engine block by rotating and pushing forward until seated.
  2.  
  3. Install the thrust plate screws and tighten to 89 inch lbs. (10 Nm).
  4.  
  5. Install the front cover, vibration dampener and serpentine belt.
  6.  
  7. Install the valve lifter and pushrod cover.
  8.  
  9. Install the pushrods and rocker arm cover.
  10.  
  11. Install the engine into the vehicle, as outlined earlier in this information.
  12.  
  13. Refill all necessary fluids, then connect the negative battery cable.
  14.  
  15. Start the engine and check for leaks.
  16.  

2.8L, 3.1L and 3l.8L Engines

See Figure 4



Click image to see an enlarged view

Fig. Fig. 4: Camshaft removal-1996 3.8L engine shown

For the removal of the camshaft, the engine assembly must be removed from the vehicle.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine assembly from the vehicle, as outlined earlier in this information.
  4.  
  5. Remove the rocker covers and remove the valve lifters.
  6.  
  7. Remove the front cover assembly, timing chain and sprockets.
  8.  
  9. Carefully remove the camshaft by sliding it from the block.
  10.  

To install:
  1. Coat the camshaft journals with engine oil. Coat the camshaft lobes with GM Engine Oil Supplement (E.O.S) or equivalent.
  2.  
  3. Slide the camshaft into the block.
  4.  
  5. Install the timing chain and sprockets, making sure to align the timing marks.
  6.  
  7. Install the front cover assembly. Install the valve lifters.
  8.  
  9. Install the engine assembly into the vehicle, as outlined earlier in this information.
  10.  
  11. Connect the negative battery cable, then start the engine and check for leaks.
  12.  

3.4L Engine

See Figure 5



Click image to see an enlarged view

Fig. Fig. 5: Camshaft and related components-3.4L engine

LEFT SIDE (FRONT)
  1. Disconnect the negative battery cable.
  2.  
  3. Properly drain the cooling system into a suitable container.
  4.  
  5. Remove the left side cam carrier as follows:
    1. Disconnect oil/air breather hose from cam carrier cover. Tag and disconnect the spark plug wires from plugs, then remove the rear spark plug wire cover.
    2.  
    3. Remove the cam carrier cover bolts and lift OFF cover. Remove gasket and O-rings from cover.
    4.  
    5. Remove the secondary timing belt by removing secondary timing belt actuator and tensioner assembly and sliding belt from pulleys. in. (5.5mm) fuel line hose for the intake valves.
    6.  
    7. Remove the exhaust crossover pipe and torque strut.
    8.  
    9. Remove the torque strut bracket from the engine.
    10.  
    11. Unfasten the cam carrier mounting bolts and nuts, then remove the cam carrier.
    12.  
    13. Remove cam carrier gasket from cylinder head.
    14.  

  6.  
  7. Remove the 6 lifter hold-down hoses. Remove the lifters.
  8.  
  9. Install the cam hold-down tool J-38613 or equivalent, in place and remove the cam sprockets.
  10.  
  11. Remove the cam carrier end caps and retainer plate bolts and plate.
  12.  
  13. Remove camshaft hold hold-down tool, then carefully remove camshaft out the back of the carrier.
  14.  

To install:
  1. Coat the camshaft lobes and journals with clean engine oil and install the camshaft into carrier. Install retaining plate and bolts and tighten to 89 inch lbs. (10 Nm). Install the cam carrier end caps.
  2.  
  3. Install the cam sprocket(s).
  4.  
  5. Adjust cam timing and install cam hold-down tool.
  6.  
  7. Lubricate the lifters with clean engine oil, then install them into their original positions.
  8.  
  9. Install the lifter hold-down hoses to cam carrier.
  10.  
  11. Install the left side cam carrier as follows:
    1. Install a new gasket on cam carrier to cylinder mounting surface. -38613 or equivalent, to the carrier assembly.
    2.  
    3. Install the cam carrier to the cylinder head. Install mounting bolts and nuts and tighten to 18 ft. lbs. (25 Nm).
    4.  
    5. Remove the lifter hold-down hoses and cam hold-down tool.
    6.  
    7. Install the torque strut bracket to the engine and install torque strut.
    8.  
    9. Install the engine crossover pipe.
    10.  
    11. Install the secondary timing belt and cam carrier cover.
    12.  
    13. Install the spark plug cover and connect the wires.
    14.  
    15. Connect the breather hose to cam carrier cover.
    16.  

  12.  
  13. Add fluids as required, then connect the negative battery cable. Start engine and check for leaks.
  14.  

RIGHT SIDE (REAR)
  1. Disconnect the negative battery cable. Properly drain the cooling system into a suitable container.
  2.  
  3. Remove the right side cam carrier as follows:
    1. Remove the intake plenum and right timing belt cover.
    2.  
    3. Tag and disconnect the right spark plug wires.
    4.  
    5. Disconnect the air/oil separator hose from the cam carrier cover.
    6.  
    7. Unfasten the cam carrier cover bolts, then lift the cover OFF. Remove the gasket and O-rings from cover.
    8.  
    9. Remove the secondary timing belt by removing secondary timing belt actuator and tensioner assembly and sliding belt from pulleys. in. (5.5mm) fuel line hose for the intake valves.
    10.  
    11. Remove the exhaust crossover pipe and torque strut.
    12.  
    13. Remove the torque strut bracket from the engine. Remove the front engine lift hook.
    14.  
    15. Unfasten the cam carrier mounting bolts, then remove the cam carrier.
    16.  
    17. Remove the cam carrier gasket from cylinder head.
    18.  

  4.  
  5. Remove 6 lifter hold-down hoses, then remove the lifters.
  6.  
  7. Install cam hold-down tool J-38613 or equivalent, and remove the cam sprocket.
  8.  
  9. Remove the cam carrier end caps and retainer plate. Remove cam hold-down tool, then carefully slide the camshaft out the rear of the carrier.
  10.  

To install
  1. Lubricate the camshaft lobes and journals with clean engine oil and carefully slide into the cam carrier. Install the retainer plate and bolts and tighten bolts to 89 inch lbs. (10 Nm).
  2.  
  3. Install the cam carrier end caps and cam sprockets.
  4.  
  5. Install the camshaft carrier hold-down tool and adjust cam timing.
  6.  
  7. Lubricate the lifters with clean engine oil, then install them into their original positions.
  8.  
  9. Attach the lifter hold-down hoses to cam carrier.
  10.  
  11. Install the right side cam carrier, as follows:
    1. Install new gasket on cam carrier to cylinder mounting surface.
    2.  
    3. Install cam hold-down tool J-38613 or equivalent, to the carrier assembly.
    4.  
    5. Install the cam carrier to the cylinder head. Install the mounting bolts and nuts and tighten to 18 ft. lbs. (25 Nm).
    6.  
    7. Remove the lifter hold-down hoses and cam hold-down tool.
    8.  
    9. Install the torque strut bracket to engine, then install the torque strut.
    10.  
    11. Install the engine crossover pipe and engine lift hook.
    12.  
    13. Install the secondary timing belt and cam carrier cover.
    14.  
    15. Connect the spark plug wires, then install the cover.
    16.  

  12.  
  13. Add fluids as required. Connect the negative battery cable, then start engine and check for fluid leaks.
  14.  

INSPECTION



  1. Check the camshaft sprocket, keyway and threads, bearing journals and lobes for wear, galling, gouges or overheating. If any of these conditions exist, replace the camshaft.
  2.  

Do NOT attempt to repair the camshaft. Always replace the camshaft and lifters as an assembly. Old valve lifters will destroy a new camshaft in less time than it took you to replace the camshaft.

  1. Camshaft Lift Measurement:
    1. Lubricate the camshaft bearings with Assembly Lube 1051396 or equivalent.
    2.  
    3. Carefully install the camshaft into the block. If the cam bearings are damaged badly, set the camshaft on "V'' blocks instead.
    4.  
    5. INstall a dial indicator J-8520 and measure the camshaft lift.
    6.  
    7. Measure the bearing journals with a micrometer. Take measurements for run-out and diameter. If not within specification in the "Camshaft'' chart in the beginning of this information, replace the camshaft.
    8.  

  2.  

 
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