Mazda B-Series 1998-06

Timing Chain

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Inspecting The Timing Chain



Timing Chain Deflection
  1. Remove the timing chain tensioner.
  2.  
  3. Rotate the crankshaft counterclockwise (as viewed from the front of the engine) to take up the slack on the left hand side of the chain.
  4.  
  5. Mark a reference point on a block approximately at mid-point of the chain. Measure from this point to the chain.
  6.  
  7. Rotate the crankshaft in the opposite direction to take up the slack on the right hand side of the chain. Force the left hand side of the chain out with your fingers and measure the distance between the reference point and the chain. The deflection is the difference between the two measurements.
  8.  
  9. If the deflection measurement exceeds specification, replace the timing chain and sprockets.
  10.  
  11. If the wear on the tensioner face exceeds 1.5mm, replace the tensioner.
  12.  
  13. When installing the crankshaft sprocket, fill the keyway chamfer cavity with EOAZ-19554-AA Threadlock and Sealer or equivalent, flush with the front face of the sprocket.
  14.  

Removal & Installation



4.0L Engine
Timing Chains

NOTE
This engine uses a primary chain and sprocket assembly and a right and left secondary chain and sprocket assembly. The procedure below outlines the primary chain assembly and the left secondary chain assembly (left lower cassette assembly).



Click image to see an enlarged view

Fig. Primary and left secondary timing chain assemblies-4.0L engine

  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
    NOTE
    On some vehicles, when the battery cable is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven to relearn its strategy.

  4.  
  5. Remove the intake manifold.
  6.  
  7. Remove the fuel supply manifold.
  8.  
  9. Remove the accessory drive belt.
  10.  
  11. Remove the thermostat housing.
  12.  
  13. Remove the valve covers.
    NOTE
    Mark each camshaft roller follower to ensure its original position during reassembly.

  14.  
  15. Using tool 303-581, remove the roller followers.
  16.  
  17. Rotate the crankshaft clockwise to position the number one cylinder at TDC.
  18.  
  19. Remove the left hydraulic chain tensioner. Install tool 303-578 and tighten the bolts to 89 inch lbs. Remove the left camshaft sprocket bolt.
  20.  
  21. Using tool 303-674, which prevents the crankshaft from turning, remove the jackshaft sprocket bolt. Remove the bolts and the primary chain tensioner. Remove these components as an assembly.
  22.  
  23. Remove the left cassette upper bolt. Remove the left cassette lower bolt and the left cassette.

    Click image to see an enlarged view

    Fig. Lower cassette upper bolt location-4.0L engine



    Click image to see an enlarged view

    Fig. Lower cassette lower bolt location-4.0L engine

  24.  

To install:


NOTE
The camshaft chain sprockets must be oriented correctly.



Click image to see an enlarged view

Fig. Lower cassette chain sprocket orientation-4.0L engine

  1. Install the left lower cassette bolt. Torque to 14 ft. lbs.
  2.  
  3. Install the left upper cassette bolt. Torque to 9 ft. lbs.
  4.  
  5. Install the primary chain and sprockets, as an assembly.
  6.  
  7. Install the primary chain tensioner and the bolts. Torque to 80 inch lbs.
  8.  
  9. Using the special tool to prevent the crankshaft from turning, tighten the jackshaft sprocket bolt in two stages.

    Step 1: 33 ft. lbs. (45 Nm).
     
    Step 2: Rotate the bolt an additional 90 degrees.
     

  10.  
  11. Loosely install the camshaft sprocket bolt.
  12.  
  13. Retime the camshafts.
    NOTE
    The camshafts must be retimed when either camshaft is disturbed.

  14.  
  15. Continue the installation in the reverse order of the removal procedure.
  16.  

Setting Camshaft Timing



Timing Drive Components (Camshaft Timing)
  1. Before servicing the vehicle, refer to the Precautions Section.
  2.  
  3. Disconnect the negative battery cable.
    NOTE
    On some vehicles, when the battery cable is disconnected and reconnected, some abnormal drive symptoms may occur while the vehicle relearns its adaptive strategy. The vehicle may need to be driven to relearn its strategy.

  4.  
  5. With the vehicle in neutral, position it on a hoist.
  6.  
  7. Remove the intake manifold.
  8.  
  9. Remove the fuel supply manifold.
  10.  
  11. Remove the accessory drive belt.
  12.  
  13. Remove the thermostat housing.
  14.  
  15. Remove the roller followers.
    NOTE
    You must retime the LH and RH camshafts when either camshaft is disturbed. Turn the crankshaft clockwise to position the number one cylinder at top dead center (TDC).


    NOTE
    The special tool must be installed on the damper and should contact the engine block to position the engine at TDC.

  16.  
  17. Install the special tool.
    NOTE
    The right-hand camshaft sprocket bolt is a left-hand threaded bolt.


    NOTE
    If necessary, use camshaft gear torque adapter to loosen the camshaft sprocket bolt.



    Click image to see an enlarged view

    Fig. TDC positioning tool installed-4.0L engine



    Click image to see an enlarged view

    Fig. Loosening the right side camshaft sprocket bolt-4.0L engine



    Click image to see an enlarged view

    Fig. Camshaft holding tool installed-4.0L engine



    Click image to see an enlarged view

    Fig. Camshaft gear holding tool and adapter-4.0L engine

  18.  
  19. Using the special tool, loosen the RH camshaft sprocket bolt.
    NOTE
    The camshaft timing slots are off-center.

  20.  
  21. Position the camshaft timing slots below the centerline of the camshaft to correctly fit the special tools. Install the special tools on the front of the RH cylinder head.
  22.  
  23. Remove the RH lower splash shield.
  24.  
  25. Remove the RH camshaft tensioner.
    NOTE
    Leave the top two special tool clamp bolts loose.

  26.  
  27. Install the special tools on the rear of the RH cylinder head.
  28.  
  29. Install the special tool.
    NOTE
    The right-hand camshaft sprocket bolt is a left-hand threaded bolt.


    NOTE
    If necessary, use camshaft gear torque adapter to tighten the camshaft sprocket bolt.

  30.  
  31. Tighten the bolts.
  32.  
  33. Tighten the special tool top two clamp bolts to 10 Nm (89 inch lbs.).
  34.  
  35. Tighten the camshaft bolt.
  36.  
  37. Install the RH camshaft tensioner.
  38.  
  39. Install the RH lower splash shield.
  40.  
  41. Remove the LH camshaft tensioner.
  42.  
  43. Install the special tools on the front of the LH cylinder head and tighten the top two clamp bolts to 10 Nm (89 inch lbs.).
  44.  
  45. Loosen the LH camshaft sprocket bolt.
  46.  
  47. Loosen the top two clamp bolts on the special tool to allow the camshaft sprocket to rotate freely.
    NOTE
    The camshaft timing slots are off-center.

  48.  
  49. Position the camshaft timing slots below the centerline of the camshaft to correctly fit the special tools. Install the special tools on the rear of the LH cylinder head.
  50.  
  51. Install the special tool.
  52.  
  53. Tighten the bolts.
  54.  
  55. Tighten the special tool top two clamp bolts to 10 Nm (89 inch lbs.).
  56.  
  57. Tighten the camshaft bolt.
  58.  
  59. Install the LH camshaft tensioner.
  60.  
  61. Install the roller followers.
  62.  
  63. Install the thermostat housing.
  64.  
  65. Install the accessory drive belt.
  66.  
  67. Install the fuel supply manifold.
  68.  
  69. Install the intake manifold.
  70.  
  71. Install the RH valve cover.
  72.  
  73. Install the LH valve cover.
  74.  

 
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