Cherokee, Grand Cherokee, 1999-2005

Camshaft, Bearings & Lifters

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Removal & Installation



2.5L Engine
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Drain the cooling system.
  4.  
  5. Recover the A/C refrigerant, if equipped with air conditioning.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Keep all valve train components in order for assembly.



    Negative battery cable
     
    Grille, if necessary
     
    Radiator
     
    A/C condenser, if equipped
     
    Distributor and ignition wires
     
    Valve cover
     



    Rocker arms and pushrods
     
    Hydraulic valve tappets
     
    Accessory drive belt
     
    Crankshaft damper
     
    Front cover
     
    Timing chain and gears
     
    Camshaft
     

  8.  

To install:


NOTE
If the camshaft sprocket appears to have been rubbing against the cover, check the oil pressure relief holes in the rear cam journal for debris.

  1. Lubricate the camshaft with clean engine oil.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Timing chain and gears
     
    Front cover
     
    Crankshaft damper
     
    Accessory drive belt
     
    Hydraulic valve tappets
     
    Rocker arms and pushrods
     
    Valve cover
     
    Distributor
     
    A/C condenser, if equipped
     
    Radiator
     
    Grille, if removed
     
    Negative battery cable
     

  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. Recharge the A/C system, if equipped.
  8.  
  9. Start the engine, check for leaks and repair if necessary.
  10.  

3.7L Engine
Left Side
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
    WARNING
    When the timing chain is removed and the cylinder heads are still installed, DO NOT forcefully rotate the camshafts or crankshaft independently of each other. Severe valve and/or piston damage can occur.


    WARNING
    When removing the cam sprocket, timing chains or camshaft, Failure to use Special Tool 8379 will result in hydraulic tensioner ratchet over extension, requiring timing chain cover removal to reset the tensioner ratchet.

  2.  
  3. Remove cylinder head cover.
  4.  
  5. Set engine to TDC cylinder No. 1, camshaft sprocket V6 marks at the 12 o-clock position.

    Click image to see an enlarged view

    Fig. V6 mark at the 12 o-clock position-3.7L engine

  6.  
  7. Mark one link on the secondary timing chain on both sides of the V6 mark on the camshaft sprocket to aid in installation.
    WARNING
    Do not hold or pry on the camshaft target wheel (located on the right side camshaft sprocket) for any reason, severe damage will occur to the target wheel resulting in a vehicle no start condition.

  8.  
  9. Loosen but do not remove the camshaft sprocket retaining bolt. Leave the bolt snug against the sprocket.
    WARNING
    The timing chain tensioners must be secured prior to removing the camshaft sprockets. Failure to secure tensioners will allow the tensioners to extend, requiring timing chain cover removal in order to reset tensioners.


    WARNING
    Do not force wedge past the narrowest point between the chain strands. Damage to the tensioners may occur.

  10.  
  11. Position Special Tool 8379 timing chain wedge between the timing chain strands, tap the tool to securely wedge the timing chain against the tensioner arm and guide.

    Click image to see an enlarged view

    Fig. Position Special Tool 8379 timing chain wedge between the timing chain strands-3.7L engine

  12.  
  13. Hold the camshaft with Special Tool 8428 Camshaft Wrench, or equivalent, while removing the camshaft sprocket bolt and sprocket.

    Click image to see an enlarged view

    Fig. Hold the camshaft with Special Tool 8428 Camshaft Wrench, or equivalent-3.7L engine

  14.  
  15. Using Special Tool 8428 Camshaft Wrench, gently allow the camshaft to rotate 5° clockwise until the camshaft is in the neutral position (no valve load).
  16.  
  17. Starting at the outside working inward, loosen the camshaft bearing cap retaining bolts 1 / 2 turn at a time. Repeat until all load is off the bearing caps.
    WARNING
    Do not stamp or strike the camshaft bearing caps. Severe damage will occur to the bearing caps.


    NOTE
    When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing camshaft.

  18.  
  19. Remove the camshaft bearing caps and the camshaft.
  20.  

To install:

  1. Lubricate camshaft journals with clean engine oil.
    NOTE
    Position the left side camshaft so that the camshaft sprocket dowel is near the 1 o-clock position. This will place the camshaft at the neutral position easing the installation of the camshaft bearing caps.

  2.  
  3. Position the camshaft into the cylinder head.
  4.  
  5. Install the camshaft bearing caps, hand tighten the retaining bolts.
    NOTE
    Caps should be installed so that the stamped numbers on the caps are in numerical order, (1 thru 4) from the front to the rear of the engine. All caps should be installed so that the stamped arrows on the caps point toward the front of the engine.

  6.  
  7. Working in 1 / 2 turn increments, tighten the bearing cap retaining bolts starting with the middle cap working outward.

    Click image to see an enlarged view

    Fig. Camshaft bearing cap torque sequence-3.7L engine

  8.  
  9. Torque the camshaft bearing cap retaining bolts to 100 inch lbs. (11 Nm).
  10.  
  11. Position the camshaft drive gear into the timing chain aligning the V6 mark between the two marked chain links (two links marked during removal).
  12.  
  13. Using Tool 8428 Camshaft Wrench, rotate the camshaft until the camshaft sprocket dowel is aligned with the slot in the camshaft sprocket. Install the sprocket onto the camshaft.
    WARNING
    Remove excess oil from camshaft sprocket bolt. Failure to do so can cause bolt over-torque resulting in bolt failure.

  14.  
  15. Remove excess oil from bolt, then install the camshaft sprocket retaining bolt and hand tighten.
  16.  
  17. Remove Special Tool 8379 timing chain wedge.
  18.  
  19. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to 90 ft. lbs. (122 Nm).
  20.  
  21. Install the cylinder head cover.
  22.  

Right Side
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
    WARNING
    When the timing chain is removed and the cylinder heads are still installed, do not forcefully rotate the camshafts or crankshaft independently of each other. Severe valve and/or piston damage can occur.


    WARNING
    When removing the cam sprocket, timing chains or camshaft, Failure to use special tool 8379 will result in hydraulic tensioner ratchet over extension, Requiring timing chain cover removal to re-set the tensioner ratchet.

  2.  
  3. Remove the cylinder head cover.
  4.  
  5. Set engine to TDC cylinder No. 1, camshaft sprocket V6 marks at the 12 o-clock position.
  6.  
  7. Mark one link on the secondary timing chain on both sides of the V6 mark on the camshaft sprocket to aid in installation.
    WARNING
    Do not hold or pry on the camshaft target wheel for any reason, Severe damage will occur to the target wheel. A damaged target wheel could cause a vehicle no start condition.

  8.  
  9. Loosen but do not remove the camshaft sprocket retaining bolt. Leave bolt snug against sprocket.
    NOTE
    The timing chain tensioners must be secured prior to removing the camshaft sprockets. Failure to secure tensioners will allow the tensioners to extend, requiring timing chain cover removal in order to reset tensioners.


    WARNING
    Do not force wedge past the narrowest point between the chain strands. Damage to the tensioners may occur.

  10.  
  11. Position Special Tool 8379 timing chain wedge between the timing chain strands. Tap the tool to securely wedge the timing chain against the tensioner arm and guide.
  12.  
  13. Remove the camshaft position sensor.
  14.  
  15. Hold the camshaft with Special Tool 8428 Camshaft Wrench, while removing the camshaft sprocket bolt and sprocket.
  16.  
  17. Starting at the outside working inward, loosen the camshaft bearing cap retaining bolts 1 / 2 turn at a time. Repeat until all load is off the bearing caps.
    WARNING
    Do not stamp or strike the camshaft bearing caps. Severe damage will occur to the bearing caps.


    NOTE
    When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing camshaft.

  18.  
  19. Remove the camshaft bearing caps and the camshaft.
  20.  

To install:

  1. Lubricate camshaft journals with clean engine oil.
    NOTE
    Position the right side camshaft so that the camshaft sprocket dowel is near the 10 o-clock position. This will place the camshaft at the neutral position easing the installation of the camshaft bearing caps.

  2.  
  3. Position the camshaft into the cylinder head.
  4.  
  5. Install the camshaft bearing caps, hand tighten the retaining bolts.
    NOTE
    Caps should be installed so that the stamped numbers on the caps are in numerical order, (1 thru 4) from the front to the rear of the engine. All caps should be installed so that the stamped arrows on the caps point toward the front of the engine.

  6.  
  7. Working in 1 / 2 turn increments, tighten the bearing cap retaining bolts starting with the middle cap working outward.
  8.  
  9. Torque the camshaft bearing cap retaining bolts to 100 inch lbs. (11 Nm).
  10.  
  11. Position the camshaft drive gear into the timing chain aligning the V6 mark between the two marked chain links (two links marked during removal).
  12.  
  13. Using Special Tool 8428 Camshaft Wrench, rotate the camshaft until the camshaft sprocket dowel is aligned with the slot in the camshaft sprocket. Install the sprocket onto the camshaft.
    WARNING
    Remove excess oil from camshaft sprocket bolt. Failure to do so can cause bolt over-torque resulting in bolt failure.

  14.  
  15. Remove excess oil from camshaft sprocket bolt, then install the camshaft sprocket retaining bolt and hand tighten.
  16.  
  17. Remove timing chain wedge special tool 8379.
  18.  
  19. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to 90 ft. lbs. (122 Nm).
  20.  
  21. Install the camshaft position sensor.
  22.  
  23. Install the cylinder head cover.
  24.  

4.0L Engine
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Drain the cooling system.
  4.  
  5. Recover the A/C refrigerant, if equipped with air conditioning.
  6.  
  7. Remove or disconnect the following:
    NOTE
    Keep all valve train components in order for assembly.



    Negative battery cable
     
    Grille, if necessary
     
    Radiator
     
    A/C condenser, if equipped
     
    Distributor or camshaft sensor housing
     
    Valve cover
     



    Rocker arms and pushrods
     
    Cylinder head
     
    Hydraulic valve tappets
     
    Accessory drive belt
     
    Crankshaft damper
     
    Front cover
     
    Timing chain and gears
     
    Thrust plate
     
    Camshaft
     

  8.  

To install:

  1. Lubricate the camshaft with clean engine oil.
  2.  
  3. Install or connect the following:

    Camshaft
     
    Thrust plate. Torque the bolts to 18 ft. lbs. (24 Nm).
     
    Timing chain and gears
     
    Front cover
     
    Crankshaft damper
     
    Accessory drive belt
     
    Hydraulic valve tappets
     
    Cylinder head
     
    Rocker arms and pushrods
     
    Valve cover
     
    Distributor or camshaft sensor housing
     
    A/C condenser, if equipped
     
    Radiator
     
    Grille, if removed
     
    Negative battery cable
     

  4.  
  5. Fill and bleed the cooling system.
  6.  
  7. Recharge the A/C system, if equipped.
  8.  
  9. Start the engine, check for leaks and repair if necessary.
  10.  

4.7L Engine
Left Side
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Remove cylinder head cover.
    WARNING
    When the timing chain is removed and the cylinder heads are still installed, DO NOT forcefully rotate the camshafts or crankshaft independently of each other. Severe valve and/or piston damage can occur.


    WARNING
    When removing the cam sprocket, timing chains or camshaft, failure to use Special Tool 8350 will result in hydraulic tensioner ratchet over extension, requiring timing chain cover removal to reset the tensioner ratchet.



    Click image to see an enlarged view

    Fig. Set engine to TDC cylinder no.1, camshaft sprocket V8 marks at the 12 o-clock position-4.7L engine

  4.  
  5. Set engine to TDC cylinder no.1, camshaft sprocket V8 marks at the 12 o-clock position.
  6.  
  7. Mark one link on the secondary timing chain on both sides of the V8 mark on the camshaft sprocket to aid in installation.
    WARNING
    Do not hold or pry on the camshaft target wheel (located on the right side camshaft sprocket) for any reason, severe damage will occur to the target wheel resulting in a vehicle no start condition.

  8.  
  9. Loosen but do not remove the camshaft sprocket retaining bolt. Leave the bolt snug against the sprocket.
    NOTE
    The timing chain tensioners must be secured prior to removing the camshaft sprockets. Failure to secure tensioners will allow the tensioners to extend, requiring timing chain cover removal in order to reset tensioners.


    WARNING
    Do not force wedge past the narrowest point between the chain strands. Damage to the tensioners may occur.



    Click image to see an enlarged view

    Fig. The timing chain tensioners must be secured prior to removing the camshaft sprockets-4.7L engine

  10.  
  11. Position Special Tool 8350 timing chain wedge between the timing chain strands, tap the tool to securely wedge the timing chain against the tensioner arm and guide.
    NOTE
    When gripping the camshaft, place the pliers on the tube portion of the camshaft only. Do not grip the lobes or the sprocket areas.



    Click image to see an enlarged view

    Fig. Hold the camshaft with adjustable pliers is the camshaft dowel-4.7L engine



    Click image to see an enlarged view

    Fig. Hold the left camshaft sprocket with a spanner wrench while removing he camshaft sprocket-4.7L engine



    Click image to see an enlarged view

    Fig. Camshaft bearing cap bolt tightening sequence-4.7L engine



    Click image to see an enlarged view

    Fig. Turn the camshaft with pliers, if needed, to align the dowel in the sprocket-4.7L engine

  12.  
  13. Hold the camshaft with adjustable pliers while removing the camshaft sprocket bolt and sprocket.
  14.  
  15. Using the pliers, gently allow the camshaft to rotate 15° clockwise until the camshaft is in the neutral position (no valve load).
  16.  
  17. Starting at the outside working inward, loosen the camshaft bearing cap retaining bolts 1 / 2 turn at a time. Repeat until all load is off the bearing caps.
    WARNING
    Do not stamp or strike the camshaft bearing caps. Severe damage will occur to the bearing caps.


    NOTE
    When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing camshaft.

  18.  
  19. Remove the camshaft bearing caps and the camshaft.
  20.  

To install:

Click image to see an enlarged view

Fig. Camshaft tightening sequence-4.7L engine

  1. Lubricate camshaft journals with clean engine oil.
    NOTE
    Position the left side camshaft so that the camshaft sprocket dowel is near the 1 o-clock position. This will place the camshaft at the neutral position easing the installation of the camshaft bearing caps.

  2.  
  3. Position the camshaft into the cylinder head.
  4.  
  5. Install the camshaft bearing caps, hand tighten the retaining bolts.
  6.  
  7. Working in 1 / 2 turn increments, tighten the bearing cap retaining bolts starting with the middle cap working outward.
  8.  
  9. Torque the camshaft bearing cap retaining bolts to 100 inch lbs. (11 Nm).
  10.  
  11. Position the camshaft drive gear into the timing chain aligning the V8 mark between the two marked chain links (two links marked during removal).
    NOTE
    When gripping the camshaft, place the pliers on the tube portion of the camshaft only. Do not grip the lobes or the sprocket areas.

  12.  
  13. Using the adjustable pliers, rotate the camshaft until the camshaft sprocket dowel is aligned with the slot in the camshaft sprocket. Install the sprocket onto the camshaft.
    WARNING
    Remove excess oil from camshaft sprocket bolt. Failure to do so can cause bolt over-torque resulting in bolt failure.

  14.  
  15. Remove excess oil from bolt, then install the camshaft sprocket retaining bolt and hand tighten.
  16.  
  17. Remove Special Tool 8350 timing chain wedge.

    Click image to see an enlarged view

    Fig. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt is the torque wrench, is the head-4.7L engine

  18.  
  19. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to 90 ft. lbs. (122 Nm).
  20.  
  21. Install the cylinder head cover.
  22.  

Right Side
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
    WARNING
    When the timing chain is removed and the cylinder heads are still installed, do not forcefully rotate the camshafts or crankshaft independently of each other. Severe valve and/or piston damage can occur.


    WARNING
    When removing the cam sprocket, timing chains or camshaft, failure to use special tool 8350 will result in hydraulic tensioner ratchet over extension, requiring timing chain cover removal to reset the tensioner ratchet.

  2.  
  3. Set engine to TDC cylinder no.1, camshaft sprocket V8 marks at the 12 o-clock position.
  4.  
  5. Mark one link on the secondary timing chain on both sides of the V8 mark on the camshaft sprocket to aid in installation.
    WARNING
    Do not hold or pry on the camshaft target wheel for any reason, severe damage will occur to the target wheel. A damaged target wheel could cause a vehicle no start condition.

  6.  
  7. Loosen but do not remove the camshaft sprocket retaining bolt. Leave bolt snug against sprocket.
    NOTE
    The timing chain tensioners must be secured prior to removing the camshaft sprockets. Failure to secure tensioners will allow the tensioners to extend, requiring timing chain cover removal in order to reset tensioners.


    WARNING
    Do not force wedge past the narrowest point between the chain strands. Damage to the tensioners may occur.

  8.  
  9. Position Special Tool 8350 timing chain wedge between the timing chain strands. Tap the tool to securely wedge the timing chain against the tensioner arm and guide.
  10.  
  11. Remove the camshaft position sensor.
    NOTE
    When gripping the camshaft, place the pliers on the tube portion of the camshaft only. Do not grip the lobes or the sprocket areas.

  12.  
  13. Hold the camshaft with adjustable pliers while removing the camshaft sprocket bolt and sprocket.
  14.  
  15. Using the pliers, gently allow the camshaft to rotate 45° counterclockwise until the camshaft is in the neutral position (no valve load).
  16.  
  17. Starting at the outside working inward, loosen the camshaft bearing cap retaining bolts 1 / 2 turn at a time. Repeat until all load is off the bearing caps.
    WARNING
    Do not stamp or strike the camshaft bearing caps. Severe damage will occur to the bearing caps.


    NOTE
    When the camshaft is removed the rocker arms may slide downward, mark the rocker arms before removing camshaft.

  18.  
  19. Remove the camshaft bearing caps and the camshaft.
  20.  

To install:

  1. Lubricate camshaft journals with clean engine oil.
    NOTE
    Position the right side camshaft so that the camshaft sprocket dowel is near the 10 o-clock position. This will place the camshaft at the neutral position easing the installation of the camshaft bearing caps.

  2.  
  3. Position the camshaft into the cylinder head.
  4.  
  5. Install the camshaft bearing caps, hand tighten the retaining bolts.
  6.  
  7. Working in 1 / 2 turn increments, tighten the bearing cap retaining bolts starting with the middle cap working outward.
  8.  
  9. Torque the camshaft bearing cap retaining bolts to 100 inch lbs.(11 Nm).
  10.  
  11. Position the camshaft drive gear into the timing chain aligning the V8 mark between the two marked chain links (two links marked during removal).
    NOTE
    When gripping the camshaft, place the pliers on the tube portion of the camshaft only. Do not grip the lobes or the sprocket areas.

  12.  
  13. Using the adjustable pliers, rotate the camshaft until the camshaft sprocket dowel is aligned with the slot in the camshaft sprocket. Install the sprocket onto the camshaft.
    WARNING
    Remove excess oil from camshaft sprocket bolt. Failure to do so can cause bolt over-torque resulting in bolt failure.

  14.  
  15. Remove excess oil from camshaft sprocket bolt, then install the camshaft sprocket retaining bolt and hand tighten.
  16.  
  17. Remove timing chain wedge special tool 8350.

    Click image to see an enlarged view

    Fig. Tightening the right side camshaft sprocket retaining bolt-4.7L engine

  18.  
  19. Using Special Tool 6958 spanner wrench with adapter pins 8346, torque the camshaft sprocket retaining bolt to 90 ft. lbs. (122 Nm).
  20.  
  21. Install the camshaft position sensor.
  22.  
  23. Install the cylinder head cover.
  24.  

5.7L Engine
  1. Before servicing the vehicle, please familiarize yourself with safety procedures.
  2.  
  3. Remove the battery negative cable.
  4.  
  5. Remove the air cleaner assembly.
  6.  
  7. Drain coolant.
  8.  
  9. Remove the accessory drive belt.
  10.  
  11. Remove the generator.
  12.  
  13. Remove the A/C compressor, and set aside.
  14.  
  15. Remove the radiator.
  16.  
  17. Remove intake manifold.
  18.  
  19. Remove cylinder head covers.
  20.  
  21. Remove both left and right cylinder heads.
  22.  
  23. Remove the oil pan.
  24.  
  25. Remove timing case cover.
  26.  
  27. Remove the oil pick up tube.
  28.  
  29. Remove the oil pump.
  30.  
  31. Remove timing chain.
  32.  
  33. Remove camshaft tensioner/thrust plate assembly.
    NOTE
    Identify lifters to ensure installation in original location.

  34.  
  35. Remove the tappets and retainer assembly.
  36.  
  37. Install a long bolt into front of camshaft to aid in removal of the camshaft. Remove camshaft, being careful not to damage cam bearings with the cam lobes.

    Click image to see an enlarged view

    Fig. Lifter set-5.7L engine

  38.  

To install:


NOTE
The 5.7L LX engine uses a unique camshaft for use with the Multi Displacement System. When installing a new camshaft, the replacement camshaft must be compatible with the Multi Displacement System.

  1. Lubricate camshaft lobes and camshaft bearing journals and insert the camshaft.
  2.  
  3. Install camshaft tensioner plate assembly. Tighten bolts to 250 inch lbs. (28 Nm).
  4.  
  5. Install timing chain and sprockets.
  6.  
  7. Measure camshaft end play. If not within limits install a new thrust plate.
  8.  
  9. Install the oil pump.
  10.  
  11. Install the oil pick-up tube.
  12.  
  13. Each tappet reused must be installed in the same position from which it was removed.
    NOTE
    When camshaft is replaced, all of the tappets must be replaced.


    WARNING
    The 5.7L LX engine uses both standard roller tappets and deactivating roller tappets, for use with the Multi Displacement System. The deactivating roller tappets must be used in cylinders 1, 4, 6, 7. The deactivating tappets can be identified by the two holes in the side of the tappet body, for the latching pins.

  14.  
  15. Install tappets and retaining yoke assembly.
  16.  
  17. Install both left and right cylinder heads.
  18.  
  19. Install pushrods.
  20.  
  21. Install rocker arms.
  22.  
  23. Install timing case cover.
  24.  
  25. Install the oil pan.
  26.  
  27. Install cylinder head covers.
  28.  
  29. Install intake manifold.
  30.  
  31. Install the A/C compressor.
  32.  
  33. Install the generator.
  34.  
  35. Install the accessory drive belt.
  36.  
  37. Install the radiator.
  38.  
  39. Install the air cleaner assembly.
  40.  
  41. Install the battery negative cable.
  42.  
  43. Refill coolant.
  44.  
  45. Refill engine oil.
  46.  
  47. Start engine and check for leaks.
  48.  

 
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