Mazda B-Series 1998-06

Timing Chain & Sprockets

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Removal & Installation



4.0L Engine

Review the complete service procedure before starting this repair. Refer to the necessary service procedures in this section.

  1. Disconnect the negative battery cable.
  2.  
  3. Drain the cooling system.
  4.  


CAUTION
When draining the coolant, keep in mind that cats and dogs are attracted by ethylene glycol antifreeze, and are quite likely to drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantity. Always drain the coolant into a sealable container. Coolant should be reused unless it is contaminated or several years old.



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Fig. To remove the timing chain and sprockets, first remove the engine front cover

  1. Remove the front cover.
  2.  
  3. Remove the radiator.
  4.  



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Fig. Timing chain mounting-4.0L engine

  1. Rotate the engine by hand until the No.1 cylinder is at TDC compression, and the timing marks are aligned.
  2.  



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Fig. Remove the tensioner lower attaching bolt...



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Fig. ... and install a holding clip in the bolt hole and the slot on the rubbing block



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Fig. Unbolt and remove the tensioner



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Fig. A close-up view of a homemade holding clip ...



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Fig. ... and its proper positioning on the tensioner

  1. Remove the lower tensioner bolt and install a holding clip in the bolt hole and the slot on the rubbing block.
  2.  
  3. Unbolt and remove the tensioner.
  4.  
  5. Remove the camshaft sprocket bolt and sprocket retaining key.
  6.  



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Fig. Loosen the camshaft sprocket bolt ...



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Fig. ... then remove it



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Fig. Remove the camshaft sprocket and chain

  1. Remove the camshaft and crankshaft sprockets with the timing chain.
  2.  



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Fig. If necessary, unbolt the chain guide attaching bolts...



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Fig. ... and remove the guide from the engine



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Fig. To remove the crankshaft sprocket, use a chisel to loosen the keyway ...



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Fig. ... then remove the keyway from the crankshaft



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Fig. Using a jawed puller, tighten the center bolt ...



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Fig. ... and pull the crankshaft sprocket from the engine

  1. If necessary, remove the chain guide.
  2.  

To install:

  1. Install the timing chain guide. Make sure the pin of the guide is in the hole in the block. Tighten the bolts to 84-96 inch lbs. (9-11 Nm).
  2.  
  3. Align the timing marks on the crankshaft and camshaft sprockets and install the sprockets and chain.
  4.  



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Fig. Timing chain alignment-4.0L engine

  1. Install the camshaft sprocket bolt and sprocket retaining key. Make sure that the timing marks are still aligned.
  2.  
  3. Install the tensioner with the clip in place to keep it retracted.
  4.  
  5. Install the crankshaft key. Make sure the timing marks are still aligned.
  6.  
  7. Make sure the tensioner side of the chain is held inward and the other side is straight and tight.
  8.  
  9. Install the camshaft sprocket bolt and tighten it to 50 ft. lbs. (68 Nm).
  10.  
  11. Remove the tensioner clip.
  12.  
  13. Check camshaft end-play.
  14.  
  15. Install the front cover.
  16.  
  17. Install the radiator.
  18.  
  19. Fill the cooling system.
  20.  
  21. Fill the crankcase to the proper level. Connect the negative battery cable. Start engine check for leaks and roadtest the vehicle for proper operation.
  22.  

 
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