300, Magnum, 2005

Camshaft, Bearings & Lifters

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Bearing Replacement



The camshaft bearings are not serviceable. Do not attempt to replace cam bearings for any reason.

Inspection



  1. Inspect camshaft bearing journals (4) for damage and binding. If journals are binding, check the cylinder head for damage. Also check cylinder head oil holes for clogging.
  2.  
  3. Check the cam lobe (5) and bearing surfaces for abnormal wear and damage. Replace camshaft if defective.
    NOTE
    If camshaft is replaced due to lobe wear or damage, always replace the rocker arms.

  4.  
  5. Measure the lobe actual wear and replace camshaft if out of limit. Standard value is 0.001 in. (0.0254mm), wear limit is 0.010 (0.254mm).

    Click image to see an enlarged view

    Fig. Inspecting the camshaft

  6.  

Removal & Installation



2.7L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  2.  
  3. Remove the primary timing chain.

    Click image to see an enlarged view

    Fig. Camshafts and related parts (1) bearing caps, (2) exhaust camshaft (3) rocker arm, (4) lash adjuster, (5) head, (6) secondary timing chain tensioner, (7) intake camshaft-2.7L engine

  4.  
  5. Remove secondary chain tensioner mounting bolts.
    NOTE
    Camshaft bearing caps have been marked during engine manufacturing. For example, number one exhaust camshaft bearing is marked -1E-

  6.  
  7. Slowly loosen camshaft bearing cap bolts in the order shown.

    Click image to see an enlarged view

    Fig. Camshaft bearing cap loosening sequence-2.7L engine

  8.  
  9. Remove camshaft bearing caps.
  10.  
  11. Remove intake camshaft, exhaust camshaft, secondary timing chain, and secondary timing chain tensioner together as an assembly.
  12.  
  13. Remove secondary timing chain tensioner and secondary timing chain from camshafts.
  14.  
  15. Remove rocker arms.
    NOTE
    If lash adjusters and rocker arms are to be reused, always mark position for reassembly in their original positions.

  16.  
  17. Remove lash adjuster(s).
  18.  

To install:

Click image to see an enlarged view

Fig. Camshaft inspection points-2.7L engine

  1. Inspect camshaft bearing journals for damage and binding. If journals are binding, check the cylinder head for damage. Also check cylinder head oil holes for clogging.
  2.  
  3. Inspect camshaft sprockets for excessive wear. Replace camshafts if necessary.
  4.  
  5. Check the cam lobe surfaces for abnormal wear and damage. Replace camshaft if defective. Measure the actual wear and replace, if out of limits-standard value is 0.0254 mm (0.001 in.); wear limit is 0.254 mm (0.010 in.).
    WARNING
    When the timing chain is removed and the cylinder heads are installed, DO NOT rotate the camshafts or crankshaft without first locating the proper crankshaft position. Failure to do so will result in valve and/or piston damage.



    Click image to see an enlarged view

    Fig. Verify that plated links (1) are facing toward the front. Align the plated links (1) to the dots (4) on the camshaft sprockets-2.7L engine

  6.  
  7. Install hydraulic lash adjuster making sure adjusters are at least partially full of oil. This can be verified by little or no plunger travel when lash adjuster is depressed.
  8.  
  9. Install rocker arm(s) and cylinder head covers.
  10.  
  11. Assemble camshaft chain on the cams. Verify that plated links are facing toward the front. Align the plated links to the dots on the camshaft sprockets.
  12.  
  13. If camshaft chain tensioner is already in the compressed and locked position, skip the next step.

    Click image to see an enlarged view

    Fig. Tensioner (1) and fabricated lock pin (2)-2.7L engine

  14.  
  15. When the camshaft chain tensioner is removed, it is necessary to compress and lock the tensioner using the following procedures:
    1. Place tensioner into a soft jaw vise.
    2.  
    3. SLOWLY compress tensioner until fabricated lock pin or the equivalent can be inserted into the locking holes.
    4.  
    5. Remove compressed and locked tensioner from the vise.
    6.  

  16.  
  17. Insert the compressed and locked camshaft chain tensioner in-between the camshafts and chain.
  18.  
  19. Rotate the cams so that the plated links and dots are facing the 12:00 o-clock position.
  20.  
  21. Install cams to cylinder head. Verify that rocker arms are correctly seated and in proper positions.
  22.  
  23. Install camshaft bearing caps. Verify that bearing caps are installed in same position as removed.

    Click image to see an enlarged view

    Fig. Camshaft bearing torque sequence-2.7L engine

  24.  
  25. Tighten cam bearing cap bolts gradually in sequence shown in to 105 inch lbs. (12 Nm).
  26.  
  27. Install secondary chain tensioner (2) bolts and tighten to 105 inch lbs. (12 Nm).
  28.  
  29. Remove locking pin from secondary tensioners.
  30.  
  31. Measure camshafts end play.
  32.  
  33. Install the primary timing chain.
  34.  

3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
    NOTE
    Camshafts are removed from the rear of each cylinder head.

  2.  
  3. Remove the cylinder head.
    WARNING
    Care must be taken not to nick or scratch the journals when removing the camshaft.

  4.  
  5. Carefully remove the camshaft from the rear of the cylinder head.

    Click image to see an enlarged view

    Fig. (1) rocker arm tool, (2) rocker arm assembly, (3) camshaft, (4) thrust collar-3.5L engine

  6.  

To install:

Click image to see an enlarged view

Fig. Camshaft inspection points-3.5L engine

  1. Inspect camshaft bearing journals for damage and binding. If journals are binding, check the cylinder head for damage. Also check cylinder head oil holes for clogging.
  2.  
  3. Check the cam lobe and bearing surfaces for abnormal wear and damage. Replace camshaft if defective.
    NOTE
    If camshaft is replaced due to lobe wear or damage, always replace the rocker arms.

  4.  
  5. Measure the lobe actual wear and replace camshaft if out of limit. Standard value is 0.0254 mm (0.001 in.), wear limit is 0.254 mm (0.010 in.).
    NOTE
    Care must be taken not to scrape or nick the camshaft journals when installing the camshaft into position.

  6.  
  7. Lubricate camshaft bearing journals, camshaft lobes and camshaft seal with clean engine oil and install camshaft into cylinder head.
  8.  
  9. Install the cylinder head.
  10.  

5.7L Engine
  1. Before servicing the vehicle, refer to the Precautions section.
  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 alternator.
  12.  
  13. Remove the air conditioning compressor, and set aside. Do not disconnect the lines.
  14.  
  15. Remove upper radiator hose.
  16.  
  17. Remove upper radiator closure panels.
  18.  
  19. Disconnect cooling fan electrical connector.
  20.  
  21. Remove cooling fan mounting bolts.
  22.  
  23. Remove radiator cooling fan assembly from vehicle.
  24.  
  25. Raise vehicle.
  26.  
  27. Remove lower splash shield.
  28.  
  29. Remove lower radiator hose.
  30.  
  31. Remove lower condenser mount bolts.
  32.  
  33. Lower vehicle.
  34.  
  35. Remove upper radiator hose.
  36.  
  37. Remove upper radiator mounting brackets and bolts.
  38.  
  39. Remove upper condenser mounting bolts.
  40.  
  41. Separate condenser assembly from radiator.
  42.  
  43. Tilt radiator toward engine and remove radiator from vehicle.
  44.  
  45. Remove intake manifold.
  46.  
  47. Remove cylinder head covers.
  48.  
  49. Remove both left and right cylinder heads
  50.  
  51. Remove the oil pan.
  52.  
  53. Remove timing case cover.
  54.  
  55. Remove the oil pick up tube.
  56.  
  57. Remove the oil pump.
  58.  
  59. Remove timing chain.
  60.  
  61. Remove camshaft tensioner/thrust plate assembly.
  62.  
  63. Remove the tappets and retainer assembly.
  64.  
  65. 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. Camshaft removal/installation-5.7L engine



    Click image to see an enlarged view

    Fig. Lifter set-5.7L engine

  66.  

To install:

  1. The cam bearings are not serviceable. Do not attempt to replace cam bearings for any reason.
  2.  
  3. Clean core hole in block.
    NOTE
    Do not apply adhesive to the new core hole plug. A new plug will have adhesive pre-applied.

  4.  
  5. Install a new core hole plug at the rear of camshaft, using suitable flat faced tool. The plug must be fully seated on the cylinder block shoulder.
    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.

  6.  
  7. Lubricate camshaft lobes and camshaft bearing journals and insert the camshaft.
  8.  
  9. Install camshaft Tensioner plate assembly. Tighten bolts to 21 ft. lbs. (28 Nm) torque.
  10.  
  11. Install timing chain and sprockets.
  12.  
  13. Measure camshaft end play. If not within limits (0.0031-0.0114 in.) install a new thrust plate.
  14.  
  15. Install the oil pump.
  16.  
  17. Install the oil pick up tube.
  18.  
  19. Each tappet reused must be installed in the same position from which it was removed. When camshaft is replaced, all of the tappets must be replaced.
    NOTE
    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, 8. The deactivating tappets can be identified by the two holes in the side of the tappet body, for the latching pins.

  20.  
  21. Install tappets and retaining yoke assembly.
  22.  
  23. Install both left and right cylinder heads.
  24.  
  25. Install pushrods.
  26.  
  27. Install rocker arms.
  28.  
  29. Install timing case cover.
  30.  
  31. Install the oil pan.
  32.  
  33. Install cylinder head covers.
  34.  
  35. Install intake manifold.
  36.  
  37. Position the air conditioning compressor on the engine.
  38.  
  39. Install the bolts that secure the air conditioning compressor and the automatic transmission cooler line bracket to the cylinder block. Tighten the bolts to 41 ft. lbs. (55 Nm).
  40.  
  41. Install the air conditioning compressor.
  42.  
  43. Install the alternator.
  44.  
  45. Install the accessory drive belt.
  46.  
  47. Position radiator into engine compartment. Seat the radiator assembly lower rubber isolators into the mounting holes in radiator lower support.
  48.  
  49. Install radiator mounting bracket and bolts. Tighten to 106 inch lbs. (12 Nm).
  50.  
  51. Position condenser on radiator and install upper mounting bolts. Tighten bolts to 50 inch lbs. (6 Nm).
  52.  
  53. Raise vehicle.
  54.  
  55. Install lower condenser mounting bolts. Tighten bolts to 88 inch lbs. (10 Nm)
  56.  
  57. Install lower radiator hose and clamp.
  58.  
  59. Lower vehicle.
  60.  
  61. Position radiator cooling fan assembly in vehicle.
  62.  
  63. Install cooling fan mounting bolts. Tighten to 50 inch lbs. (6 Nm)
  64.  
  65. Connect cooling fan electrical connector.
  66.  
  67. Install upper radiator upper hose. Align hose so it does not interfere with the accessory drive belt or engine. Position hose clamp so it will not interfere with the hood.
  68.  
  69. Install the air cleaner assembly.
  70.  
  71. Install the battery negative cable.
  72.  
  73. Refill coolant.
  74.  
  75. Refill engine oil.
  76.  
  77. Start engine and check for leaks.
  78.  

 
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