GM Grand Am/Achieva/Calais/Skylark/Somerset 1985-98

Camshaft, Bearings and Lifters

Print


CAUTION
Observe all applicable safety precautions when working around fuel. Whenever servicing the fuel system, always work in a well ventilated area. Do not allow fuel spray or vapors to come in contact with a spark or open flame. Keep a dry chemical fire extinguisher near the work area. Always keep fuel in a container specifically designed for fuel storage; also, always properly seal fuel containers to avoid the possibility of fire or explosion.

On some of these procedures, the engine may have to be raised and lowered several times.

REMOVAL & INSTALLATION



2.0L Engine

See Figure 1

  1. Relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the camshaft carrier cover.
  6.  
  7. Hold the valves in place with compressed air, using air adapters in the spark plug holes.
  8.  
  9. Compress the valve springs with valve spring compressing tool J 33302-25 or equivalent.
  10.  



Click image to see an enlarged view

Fig. Fig. 1: Using the special tool to compress the valve springs-1989 2.0L engine shown

  1. Remove the rocker arms and lifters and keep them in order for reassembly. Hold the camshaft with an open-end wrench and remove the camshaft sprocket. Try to keep the valve timing by using a rubber cord, if possible. If the timing cannot be kept intact, the timing belt will have to be reset.
  2.  
  3. Matchmark and remove the distributor.
  4.  
  5. Remove the camshaft thrust plate from the rear of the carrier.
  6.  
  7. Remove the camshaft by sliding it toward the rear. Remove the front carrier seal.
  8.  

To install:
  1. Install a new carrier seal.
  2.  
  3. Thoroughly lubricate the camshaft and journals with clean oil and install the camshaft. Be careful not to damage the seal.
  4.  
  5. Install the rear thrust plate, then tighten the bolts to 70 inch lbs. (8 Nm).
  6.  
  7. Install camshaft sprocket, timing belt and cover.
  8.  
  9. Install the distributor.
  10.  
  11. Hold the valves in place with compressed air as in Step 4, compress the valve springs and install the lifters and rocker arms.
  12.  
  13. Apply sealer to the camshaft carrier cover and install.
  14.  
  15. Connect the negative battery cable and road test the vehicle.
  16.  

2.3L and 2.4L Engines

See Figures 2 through 8

Common tools required to remove and install the camshaft, housing and lifters are as follows:



Torque angle meter-J 36660
 
Spark plug connector assembly-J 36011
 

SOHC OR INTAKE ON DOHC

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. Disconnect the negative battery cable.
  2.  
  3. Label and detach the ignition coil and module assembly electrical connections.
  4.  
  5. Unfasten the ignition coil and module assembly to camshaft housing bolts, then remove the assembly by pulling straight up. Use a special spark plug boot wire remover tool to remove connector assemblies, if they have stuck to the spark plugs.
  6.  



Click image to see an enlarged view

Fig. Fig. 2: View of the ignition coil and module assembly-2.3L and 2.4L DOHC engines



Click image to see an enlarged view

Fig. Fig. 3: View of the ignition coil and module assembly-2.3L SOHC engine

  1. On the 2.4L engines, detach the camshaft position sensor wiring.
  2.  
  3. If equipped, remove the idle speed power steering pressure switch connector.
  4.  
  5. Loosen the three power steering pump pivot bolts and remove drive belt. Remove the power steering pump and set aside. Do not disconnect the pump lines.
  6.  
  7. On the 2.3L engines, 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.
  8.  
  9. Remove vacuum line from fuel pressure regulator and detach the fuel injector harness connector.
  10.  
  11. Disconnect fuel line attaching clamp from bracket on top of intake camshaft housing.
  12.  
  13. Unfasten the fuel rail-to-camshaft housing attaching bolts, then remove the fuel rail from the cylinder head. Cover or plug injector openings in cylinder head and the injector nozzles. Leave the fuel lines attached, then position fuel rail aside (on top of the brake master cylinder).
  14.  



Click image to see an enlarged view

Fig. Fig. 4: Common fuel injection rail assembly and related components

  1. Disconnect the timing chain and housing, but do NOT remove from the engine.
  2.  
  3. Remove the intake camshaft housing cover-to-camshaft housing attaching bolts.
  4.  
  5. Unfasten the intake camshaft housing-to-cylinder head attaching bolts. Use the reverse of the tightening sequence when loosening the bolts. Leave two of the bolts loosely in place to hold the camshaft housing while separating the camshaft cover from housing.
  6.  
  7. Push the cover off the housing by threading four of the housing-to-head attaching bolts into the tapped holes in the cam housing cover.
  8.  

Tighten the bolts evenly so the cover does not bind on the dowel pins.

  1. Remove the two loosely installed camshaft housing to head bolts and remove the cover. Discard the gaskets.
  2.  



Click image to see an enlarged view

Fig. Fig. 5: Exploded view of the camshaft housing, cover and gaskets-2.3L and 2.4L engines colors vary

  1. Note the position of the chain sprocket dowel pin for reassembly.
  2.  
  3. Remove intake camshaft oil seal from camshaft and discard seal. This seal must be replaced any time the housing and cover are separated.
  4.  
  5. Remove the camshaft carrier from the cylinder head and remove the gasket. Discard the gasket.
  6.  
  7. Remove the lifters. Place them on a table exactly in the position they were removed from the engine, they should not be mixed up. To minimize bleed down:
    1. Store the lifters upside down (opposite the installed position) on a level surface
    2.  
    3. Store the lifters submerged in clean engine oil.
    4.  

  8.  

The lifters are not serviceable. If a lifter is bad, they must be replaced.

  1. Inspect the camshaft, bearing journals and lifters.
  2.  

To install:
  1. Coat the lifters with Camshaft and Lifter prelube 12345501 or equivalent. If the new lifters are installed, add engine oil supplement GM 1052367 or equivalent to the engine oil.
  2.  
  3. 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 one bolt loosely to hold it in place.
  4.  
  5. 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.
  6.  
  7. Install the camshaft in the same position as when removed. The timing chain sprocket dowel pin should be straight up and align with the centerline of the lifter bores.
  8.  
  9. 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.
  10.  



Click image to see an enlarged view

Fig. Fig. 6: View of the intake and exhaust camshaft-to-housing seal placement-2.3L and 2.4L engines colors vary



Click image to see an enlarged view

Fig. Fig. 7: Intake and exhaust camshaft housing bolt tightening sequence

  1. Apply thread locking compound to the camshaft housing and cover attaching bolt threads.
  2.  
  3. On models up to 1993:
    1. Apply pipe sealant 1052080 (or equivalent thread locking sealer) to the camshaft housing and cover retaining bolt threads. Using J 366660, install the bolts. tighten the camshaft housing-to-cylinder head bolts to 11 ft. lbs. (15 Nm) plus 75° then tighten in sequence the camshaft housing cover-to-camshaft housing bolts to 11 ft. lbs. (15 Nm) plus 25°. Refer to the accompanying illustration for bolt locations. The illustration has the 1994-98 model specifications in it, but is the same for bolt locations ect.
    2.  

  4.  
  5. On 1994-98 models:
    1. Apply pipe sealant 1052080 (or equivalent thread locking sealer) to the camshaft housing and cover retaining bolt threads. Using J 366660, install the bolts. tighten the camshaft housing-to-cylinder head bolts to 11 ft. lbs. (15 Nm) plus 90° then tighten in sequence the camshaft housing cover-to-camshaft housing bolts to 11 ft. lbs. (15 Nm) plus 30°. Refer to the accompanying figure.
    2.  

  6.  



Click image to see an enlarged view

Fig. Fig. 8: Exploded view of the intake cam cover and related components-2.3L and 2.4L engines

  1. Install the timing chain housing and the timing chain.
  2.  
  3. Uncover fuel injectors, then install new fuel injector O-ring seals lubricated with oil. Install the fuel rail.
  4.  
  5. Fasten the fuel line attaching clamp and retainer to bracket on top of the intake camshaft housing.
  6.  
  7. Connect the vacuum line to the fuel pressure regulator.
  8.  
  9. Attach the fuel injectors harness connector.
  10.  
  11. Install the oil/air separator assembly.
  12.  
  13. Lubricate the inner sealing surface of the intake camshaft seal with oil and install the seal to the housing.
  14.  
  15. Install the power steering pump pulley onto the intake camshaft.
  16.  
  17. Install the power steering pump assembly and drive belt.
  18.  
  19. Connect the idle speed power steering pressure switch connector.
  20.  
  21. 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 13-16 ft. lbs. (18-22 Nm).
  22.  
  23. Attach the electrical connectors to ignition coil and module assembly.
  24.  
  25. Connect the negative battery cable, then start the engine and check for leaks.
  26.  

If the new lifters have been installed or the lifters bled down while the engine was disassembled, excessive lifter noise may be heard. THIS IS NORMAL, no engine damage is occurring. Use the following to purge the air from the lifters:

  1. Start the engine and allow it to warm up for 5 minuets.
  2.  
  3. Increase the engine speed to 2000 rpm until the lifter noise is gone.
  4.  
  5. Return the engine to idle for an additional 5 minuets or road test.
  6.  

EXHAUST CAMSHAFT (DOHC)

Any time the camshaft housing-to-cylinder head bolts are loosened or removed, the camshaft housing to cylinder head gasket must be replaced. During disassembly be sure the valve lifters are kept in the same positions for identifications purposes for re-installation.

  1. Relieve the fuel system pressure. Disconnect the negative battery cable.
  2.  
  3. Label and disconnect the ignition coil and module assembly electrical connections. If necessary, use puller J 36011 to remove the spark plug connector if stuck. First twist, then pull up on the assembly.
  4.  
  5. Disengage the oil pressure switch wiring.
  6.  
  7. Unfasten the ignition coil and module assembly-to-camshaft housing bolts, then remove the assembly by pulling straight up. Use a special tool to remove connector assemblies if they have stuck to the spark plugs.
  8.  
  9. If equipped, remove the idle speed power steering pressure switch connector.
  10.  
  11. Remove the transaxle fluid level indicator tube assembly from exhaust camshaft cover and position aside.
  12.  
  13. Remove exhaust camshaft cover and gasket.
  14.  
  15. Disconnect the timing chain and housing but do not remove from the engine.
  16.  
  17. Remove exhaust camshaft housing to cylinder head bolts. Use the reverse of the tightening procedure when loosening camshaft housing while separating camshaft cover from housing. Leave two bolts loosely in place to hold the camshaft housing while separating the camshaft cover from the housing.
  18.  
  19. Push the cover off the housing by threading four of the housing to head attaching bolts into the tapped holes in the camshaft cover. When threading the bolt, tighten them evenly so the cover does not bind on the dowel pins.
  20.  
  21. Remove the two loosely installed camshaft housing-to-cylinder head bolts and remove cover, discard gaskets.
  22.  
  23. Loosely reinstall one camshaft housing-to-cylinder head bolt to retain the housing during camshaft and lifter removal.
  24.  
  25. Note the position of the chain sprocket dowel pin for reassembly. Remove camshaft being careful not to damage the camshaft or journals.
  26.  
  27. Remove the lifters. Place them on a table exactly in the position they were removed from the engine, they should not be mixed up. To minimize bleed down:
    1. Store the lifters upside down (opposite the installed position) on a level surface
    2.  
    3. Store the lifters submerged in clean engine oil.
    4.  

  28.  

The lifters are not serviceable. If a lifter is bad, they must be replaced.

  1. Remove the camshaft carrier from the cylinder head and remove the gasket. Discard the gasket.
  2.  
  3. Inspect the camshaft, bearing journals and lifters.
  4.  

To install:

Make sure the camshaft housing alignment dowel pins are in the cylinder head prior to installing the housing.

  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 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. The seal colors are different depending on the year of the vehicle. Refer to the picture.
  8.  
  9. Apply thread locking compound to the camshaft housing and cover attaching bolt threads.
  10.  
  11. On models up to 1993:
    1. Apply pipe sealant 1052080 (or equivalent thread locking sealer) to the camshaft housing and cover retaining bolt threads. Using J 366660, install the bolts. tighten the camshaft housing-to-cylinder head bolts to 11 ft. lbs. (15 Nm) plus 75° then tighten in sequence the camshaft housing cover-to-camshaft housing bolts to 11 ft. lbs. (15 Nm) plus 25°. Refer to the accompanying illustration for bolt locations. The illustration has the 1994-98 model specifications in it, but is the same for bolt locations ect.
    2.  

  12.  
  13. On 1994-98 models:
    1. Apply pipe sealant 1052080 (or equivalent thread locking sealer) to the camshaft housing and cover retaining bolt threads. Using J 366660, install the bolts. tighten the camshaft housing-to-cylinder head bolts to 11 ft. lbs. (15 Nm) plus 90° then tighten in sequence the camshaft housing cover-to-camshaft housing bolts to 11 ft. lbs. (15 Nm) plus 30°. Refer to the accompanying figure.
    2.  

  14.  
  15. Install timing chain housing and timing chain.
  16.  
  17. Install the exhaust camshaft housing cover with a new gasket.
  18.  
  19. Install the transaxle fluid level indicator tube assembly to the exhaust camshaft cover.
  20.  
  21. Attach the idle speed power steering pressure switch and oil pressure switch wiring.
  22.  
  23. 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 13-16 ft. lbs. (18-22 Nm).
  24.  
  25. Attach the electrical connectors to ignition coil and module assembly.
  26.  
  27. Connect the negative battery cable, then start the engine and check for leaks.
  28.  

If the new lifters have been installed or the lifters bled down while the engine was disassembled, excessive lifter noise may be heard. THIS IS NORMAL, no engine damage is occurring. Use the following to purge the air from the lifters:

  1. Start the engine and allow it to warm up for 5 minuets.
  2.  
  3. Increase the engine speed to 2000 rpm until the lifter noise is gone.
  4.  
  5. Return the engine to idle for an additional 5 minuets or road test.
  6.  

1985-89 2.5L Engine
  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine assembly from the vehicle. For details, please refer to the procedure located in this section.
  4.  
  5. Remove the rocker arm cover and pushrods, then remove the pushrod cover and valve lifters.
  6.  
  7. Disconnect and remove the front cover. For details, please refer to the procedure located in this section.
  8.  
  9. Unfasten the camshaft thrust plate screws.
  10.  

Camshaft journals are the same diameter and caution must be exercised during removal to avoid damaging the bearings.

  1. Remove the camshaft and gear from the front of the block.
  2.  
  3. Using a suitable arbor press and an adapter, remove the gear from the camshaft. Position the thrust plate to avoid damage by interference with the Woodruff key as the gear is removed.
  4.  

To install:
  1. Support the camshaft at the back of the front journal in the arbor press using press plate adapters.
  2.  
  3. Position the spacer ring, thrust plate over the end of the shaft and the Woodruff in the keyway.
  4.  
  5. Press the gear onto the camshaft, against the spacer ring. Measure the end clearance; it should be 0.0015-0.0050 inch (0.0381-0.1270mm). If the clearance is less, replace the spacer ring. If the clearance is more, replace the thrust plate.
  6.  
  7. Lubricate the camshaft journals with prelube 1052367 or equivalent.
  8.  

Camshaft journals are the same diameter and care must be used when installing the camshaft to avoid damage to the bearings.

  1. Rotate the camshaft and the crankshaft so that the timing marks on the gear teeth line up. The engine is now in the No. 4 firing position.
  2.  
  3. Position the camshaft thrust plate. Tighten the retaining screws to 89 inch lbs. (10 Nm).
  4.  
  5. Install the front cover, as outlined in this section, then install the crankshaft balancer.
  6.  
  7. Install the valve lifters, pushrod cover and pushrods, then secure the rocker arm cover.
  8.  
  9. As outlined in this section, install the engine assembly.
  10.  
  11. Connect the negative battery cable.
  12.  

1990-91 2.5L Engine
ENGINE IN VEHICLE

See Figures 9, 10 and 11

  1. Disconnect the negative battery cable. Properly relieve the fuel system pressure.
  2.  
  3. Remove the air cleaner assembly.
  4.  
  5. Drain the cooling system into a suitable container.
  6.  
  7. Disconnect the PCV valve and hose. Remove the EGR valve.
  8.  
  9. Tag and detach the spark plug wires and clips.
  10.  
  11. Remove the rocker arm cover.
  12.  
  13. Remove the fuel line bracket, then detach and plug the fuel lines.
  14.  
  15. Tag and disconnect the vacuum hoses, including the power brake booster hose.
  16.  
  17. Disconnect the wiring and throttle linkage from the TBI assembly.
  18.  
  19. Remove the transaxle downshift bracket.
  20.  
  21. Disconnect the heater hose.
  22.  
  23. Remove the power steering belt. Unfasten the power steering pump bolts, then position the pump aside.
  24.  
  25. Remove the intake manifold (including the engine lift bracket). For details, please refer to the procedure located in this section.
  26.  
  27. Detach the pushrod cover and the valve lifters.
  28.  
  29. Remove the right hand front end diagonal brace.
  30.  
  31. Install the engine lift bracket.
  32.  
  33. Unfasten the upper front engine mount-to-body bolts. Install engine support fixture tool J 28467-A or equivalent.
  34.  
  35. Raise and safely support the vehicle. Remove the right front wheel and tire assembly, then the inner splash shield.
  36.  
  37. Remove the right hand cover.
  38.  
  39. If equipped, unfasten and remove the A/C belt.
  40.  
  41. Remove the crankshaft balancer.
  42.  
  43. Unfasten the rear engine mount-to-bracket bolts and mount bolts. Remove the front transaxle strut bolts.
  44.  
  45. Remove the lower front engine mount-to-body bolts.
  46.  
  47. Remove the front lower air foil.
  48.  
  49. Unfasten the right and left front suspension bolts.
  50.  
  51. Drain the engine oil, then carefully lower the vehicle.
  52.  
  53. Unfasten the transaxle mount bolts, then lower the engine/transaxle assembly.
  54.  
  55. Raise and safely support the vehicle.
  56.  
  57. Remove the front cover as outlined in this section. Align the timing marks.
  58.  
  59. Unfasten the camshaft sprocket bolts, then remove the timing chain and sprockets. Remove the camshaft thrust plate.
  60.  

Camshaft journals are the same diameter and care must be used when removing the camshaft to avoid damage to the bearings.

  1. Remove the camshaft from the engine.
  2.  
  3. Remove the camshaft bearings by selecting the proper pilot, nut and thrust washer.
    1. Assemble bearing removal tool J 33049 or equivalent. Make sure that the tool nut engages a sufficient number of threads and pull out the bearings.
    2.  

  4.  



Click image to see an enlarged view

Fig. Fig. 9: The sequence for removing and installing camshaft bearings2.5L engine


WARNING
Camshaft bearing can not be used again once they have been removed form the engine.

To install:
  1. Install the camshaft bearings.
    1. Select the bearings with the correct pilot, nut and washer.
    2.  
    3. Place the bearing onto the tool and index the oil hole(s) of the bearing with the oil passages in the cylinder block. Pull the bearing into place.
    4.  

  2.  

Proper alignment of the oil hole is critical. Restriction of the oil flow will cause severe engine damage.



Click image to see an enlarged view

Fig. Fig. 10: Inspecting the camshaft beraring hole alignment

  1. Lubricate the camshaft journals with GM lubricant E.O.S. 1052367 or equivalent.
  2.  
  3. Installation is the reverse of the removal procedure.
  4.  
  5. Fill the cooling system and crankcase with the proper type and amount of fluids.
  6.  
  7. Connect the negative battery cable, then start the engine and check for leaks.
  8.  



Click image to see an enlarged view

Fig. Fig. 11: Common exploded view of the camshaft, timing chain and related components-2.5L engine

ENGINE REMOVED

See Figures 9 and 10

  1. Disconnect the negative battery cable. Relieve the fuel system pressure before disconnecting any fuel lines.
  2.  
  3. As outlined in this section, remove the engine from the vehicle and secure to a suitable holding fixture.
  4.  
  5. Remove the valve cover, rocker arms and pushrods. Keep all parts in order for reassembly.
  6.  
  7. Tag and detach the spark plugs, then remove the distributor and spark plugs.
  8.  
  9. Detach the pushrod cover, the gasket and the lifters. Keep all parts in order for reassembly.
  10.  
  11. Remove the alternator, alternator lower bracket and the front engine mount bracket assembly.
  12.  
  13. Remove the oil pump driveshaft and gear assembly.
  14.  
  15. Remove the crankshaft pulley and front cover. Remove the timing chain and gears, if equipped.
  16.  
  17. Unfasten the two camshaft thrust plate screws by working through the holes in the gear, then remove the thrust plate.
  18.  
  19. Remove the camshaft, and gear assembly, if gear driven by pulling it through the front of the block. Take care not to damage the bearings while removing the camshaft.
  20.  
  21. Remove the camshaft bearings by selecting the proper pilot, nut and thrust washer.
    1. Assemble bearing removal tool J 33049 or equivalent. Make sure that the tool nut engages a sufficient number of threads and pull out the bearings.
    2.  

  22.  


WARNING
Camshaft bearing can not be used again once they have been removed form the engine.

To install:
  1. Install the camshaft bearings.
    1. Select the bearings with the correct pilot, nut and washer.
    2.  
    3. Place the bearing onto the tool and index the oil hole(s) of the bearing with the oil passages in the cylinder block. Pull the bearing into place.
    4.  

  2.  

Proper alignment of the oil hole is critical. Restriction of the oil flow will cause severe engine damage.

  1. The installation is the reverse of the removal procedure. Coat all parts with a liberal amount of clean engine oil supplement before installing.
  2.  
  3. Fill all fluids to their proper levels.
  4.  
  5. Connect the negative battery cable, then start the engine and check for leaks.
  6.  

3.0L and 3.3L Engines

See Figure 12

The bearings on the 3.0L and 3.3L engines can not be removed unless the entire engine is removed from the vehicle. Refer to the procedure after Removal and Installation.

  1. Disconnect the negative battery cable. Relieve the fuel system pressure before disconnecting any fuel lines.
  2.  
  3. Remove the engine from the vehicle and secure to a suitable holding fixture.
  4.  
  5. Remove the intake manifold. For details, please refer to the procedure located in this section.
  6.  
  7. Remove the valve covers, rocker arm assemblies, pushrods and lifters. Keep all parts in order for reassembly.
  8.  
  9. Remove the crankshaft balancer from the crankshaft.
  10.  
  11. If equipped, remove the crankshaft sensor shield, then detach the sensor electrical connector.
  12.  
  13. As outlined earlier in this section, remove the front cover.
  14.  
  15. Rotate the crankshaft to align the timing marks on the timing sprockets. Remove the camshaft sprocket and the timing chain.
  16.  
  17. If equipped, remove the camshaft thrust plate.
  18.  
  19. Remove the camshaft retainer bolts and slide the camshaft forward out of the engine. Take care not to damage the bearings while removing the camshaft.
  20.  

To install:


Click image to see an enlarged view

Fig. Fig. 12: Common view of camshaft arrangement-3.3L engine shown

  1. The installation is the reverse of the removal procedure. Coat all parts with a liberal amount of clean engine oil supplement before installing.
  2.  
  3. Fill all fluids to their proper levels.
  4.  
  5. Connect the negative battery cable, then start the engine and check for leaks.
  6.  

3.1L Engine

See Figure 10

The camshaft bearing can not be reused once removed from the engine.

  1. Relieve the fuel system pressure.
  2.  
  3. Disconnect the negative battery cable.
  4.  
  5. Remove the engine from the vehicle and secure to a suitable holding fixture.
  6.  

When removing valve train components, they must be marked for installation in the same location they are removed from. When the camshaft is being replaced, the valve lifters should also be replaced.

  1. Remove the intake manifold, valve cover, rocker arms, pushrods and valve lifters.
  2.  
  3. Remove the crankshaft balancer and front cover.
  4.  
  5. Remove the timing chain and sprockets.
  6.  
  7. Unfasten the oil pump driven gear mounting bolt, then remove the oil pump driven gear.
  8.  
  9. Remove the two bolts, then remove the camshaft thrust plate.
  10.  
  11. Carefully remove the camshaft. Avoid marring the camshaft bearing surfaces.
  12.  
  13. To remove the camshaft t bearings, select the proper expander assembly.
    1. Assemble the bearing tool J 33049 or its equivalent.
    2.  
    3. Carefully tap out the bearings.
    4.  

  14.  

The camshaft bearing can not be reused once removed from the engine.

To install:
  1. Select the front, rear and intermediate camshaft bearings.
    1. Select the proper expander assembly.
    2.  
    3. Place the bearing into the tool and index the oil holes of the bearing with the oil passages of the cylinder block. Tap the bearing carefully into place. Looking from the front of the engine block, index the front bearing oil holes at 4 and 7 O'clock.
    4.  
    5. Index all other bearings oil holes at 4 O'clock.
    6.  
    7. With a piece of brass rod 3 /32 inch and a 90° bend at the end, probe the bearing oil holes and verify that they are properly aligned.
    8.  

  2.  
  3. Coat the camshaft with lubricant 1052365 or equivalent, and install the camshaft.
  4.  
  5. Install the camshaft thrust plate, then tighten the mounting bolts to 89 inch lbs. (10 Nm).
  6.  
  7. Install the oil pump driven gear, then tighten the mounting bolt to 27 ft. lbs. (36 Nm).
  8.  
  9. Install the timing chain and sprocket.
  10.  
  11. Install the camshaft thrust button and front cover.
  12.  
  13. Install the crankshaft balancer.
  14.  
  15. Install the intake manifold, valve cover, rocker arms, pushrods and valve lifters.
  16.  
  17. Install the engine assembly into the vehicle.
  18.  
  19. Connect the negative battery cable.
  20.  
  21. Adjust the valves, as required.
  22.  
  23. Start the engine and verify that there are no oil leaks.
  24.  

BEARING REPLACEMENT



See Figure 13

The bearings on the 3.0L and 3.3L engines can not be removed unless the entire engine is removed from the vehicle. A camshaft bearing remover/installer tool is required to perform this job. Tool J 33049 or its equivalent can be used.

  1. Disconnect the negative battery cable.
  2.  
  3. Remove the engine assembly from the vehicle, then remove the camshaft from the engine.
  4.  
  5. Detach the camshaft rear plug.
  6.  
  7. Assemble a suitable bearing removal tool (depending upon engine application), according to the manufacturer's directions.
  8.  
  9. Remove the camshaft bearings.
  10.  

Never reuse camshaft bearings once they have been removed. Always install new bearings.



Click image to see an enlarged view

Fig. Fig. 13: Using the proper tool to removal and/or install camshaft bearings-1995 3.1L engine shown

To install:
  1. Select and install new front, rear and intermediate camshaft bearings:
    1. Assembly a suitable bearing installation tool, following the manufacturer's instructions.
    2.  
    3. Place the bearing on the tool.
    4.  
    5. Index the bearing oil holes with cylinder block oil passages.
    6.  

  2.  
  3. Apply sealer 1052914 or RTV equivalent to the camshaft plug, then install the plug.
  4.  
  5. Install the camshaft into the engine, then install the engine in the vehicle.
  6.  
  7. Connect the negative battery cable.
  8.  

INSPECTION



Using a suitable solvent, degrease the camshaft and clean out all of the oil holes. Visually inspect the cam lobes and bearing journals for excessive wear, galling, gouges or overheating which may be indicated by discoloration. If a lobe is questionable, check all of the lobes. If a journal or lobe is worn, the camshaft MUST BE reground or replaced. Also, inspect the sprocket, keyway and threads.

If a journal is worn, there is a good chance that the bearings are worn and need replacement.

If the camshaft is damaged, DO NOT attempt to repair it, it must be replaced. If a new camshaft is installed, all of the valve lifters must be replaced.

Measure cam lift using the following instructions:

  1. Lubricate the camshaft bearings with a suitable camshaft and lifter prelube.
  2.  
  3. Carefully insert the camshaft. If the cam bearings are badly worn or damaged, set the camshaft on "V" blocks instead.
  4.  
  5. Install a suitable measure tool, depending upon engine application, and measure the cam lift. Compare to the specifications in the chart in this section. If any cam lift is out of specification, replace the camshaft.
  6.  

Measure the run-out and diameter of the bearing journals using a micrometer. If out of specification, replace the camshaft.

 
label.common.footer.alt.autozoneLogo