AutoZone 1993 Chevrolet Truck S10 P/U 4WD 4.3L TBI 6cyl | Repair Guides | Engine Mechanical | Engine Mechanical Components | Timing Chain Cover, Chain & Sprockets 3 | AutoZone.com

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    1993 Chevrolet Truck S10 P/U 4WD 4.3L TBI 6cyl

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    Ford Excursion, Expedition, Lincoln Navigator 2000-2005

    Timing Chain Cover, Chain & Sprockets 3

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    Removal & Installation



    5.4L SOHC & 6.8L Engines
    1. Before servicing the vehicle, refer to the precautions section.
    2.  
    3. Remove or disconnect the following:

      Negative battery cable
       
      Radiator, fan blade and fan shroud assembly
       
      Accessory drive belt
       
      Water pump pulley
       
      Electrical harness connectors from both ignition coils
       
      Both ignition coils with their brackets attached
       
      The 2 upper power steering pump retaining bolts
       
      The 2 lower power steering pump retaining bolts and move the pump aside
       
      Crankshaft Position (CKP) sensor electrical harness connector
       
      Retaining bolt and the CKP sensor.

      Click image to see an enlarged view

      Fig. Timing chains and related components-2001-04 5.4L and all 6.8L engines



      Click image to see an enlarged view

      Fig. Compress the tensioner while holding the ratchet mechanism with a suitable tool-2001-04 5.4L and all 6.8L engines

       

    4.  
    5. Drain the engine oil.

      The 4 oil pan-to-engine front cover retaining bolts
       
      The crankshaft damper retaining bolt and washer from the crankshaft
       
      Crankshaft damper from the crankshaft
       
      Camshaft Position (CMP) sensor retaining bolt and remove the CMP sensor
       
      Idler pulley bolt and remove the pulley
       
      The 3 belt tensioner bolts and remove the tensioner
       
      The 8 engine front cover retaining bolts and the 7 nuts. Swing the top of the cover out off the dowel pins and remove the cover.
       
      Sensor ring from the crankshaft
       

    6.  
    7. Use Crankshaft Holding Tool 303-448 (T93P-6303-A), to position the camshaft.
    8.  
    9. Rotate the crankshaft until both camshaft keyways are 90 degrees from the cam cover surface. Be sure the copper links line up with the dots on the camshaft sprockets.
      WARNING
      At no time, when the timing chains are removed and the cylinder heads are installed may the crankshaft or the camshaft be rotated. Severe piston and valve damage will occur.

    10.  
    11. Install Camshaft Holding Tool T96T-6256-B or equivalent, on the camshaft.
    12.  
    13. Remove or disconnect the following:

      2 left-hand and right-hand tensioner bolts and the timing chain tensioners
       
      Left-hand and right-hand tensioner guides off the dowel pins
       
      Right-hand timing chain from the camshaft sprocket
       
      Left-hand timing chain from the camshaft sprocket
       
      Left-hand and right-hand timing chain guide bolts, and the timing chain guides
       

    14.  

    To install:

    1. Examine the timing chains, looking for the copper links. If the copper links are not visible, lay the chain on a flat surface and pull the chain taught until the opposite sides of the chain contact one another. Mark the links at each end of the chain and use these marks in place of the copper links.
      NOTE
      If the engine jumped time, damage has been done to valves and possibly pistons and/or connecting rods. Any damage must be corrected before installing the timing chains.



      Click image to see an enlarged view

      Fig. If the copper links are not visible, mark one link on one end of the chain and 2 links on the opposite end of the chain-2001-04 5.4L and all 6.8L engines

    2.  
    3. Install or connect the following:
      NOTE
      The crankshaft sprockets are identical. They may only be installed one way, with the tapered part of the sprockets facing each other. Ensure that the keyway and timing marks on the crankshaft sprockets are aligned.



      Left-hand and right-hand timing chain guides and retaining bolts. Tighten the retaining bolts to 89 inch lbs. (10 Nm).
       
      Left-hand crankshaft sprocket with the tapered part of the sprocket facing away from the engine block.
       



      Left-hand timing chain on the camshaft and crankshaft sprockets. Be sure the 1 copper link aligns with the mark on the crankshaft sprocket and the 2 copper links align with the mark on the camshaft sprocket.
       
      Right-hand crankshaft sprocket with the tapered part of the sprocket facing the left-hand crankshaft sprocket
       
      Right-hand timing chain on the camshaft and crankshaft sprockets. Be sure the copper links of the timing chain line up with the timing marks on both sprockets.
       

    4.  
    5. It is necessary to bleed the timing chain tensioners before installation. Proceed as follows:
      1. Place the timing chain tensioner in a soft-jawed vise.
      2.  
      3. Using a small pick or similar tool, hold the ratchet lock mechanism away from the ratchet stem and slowly compress the tensioner plunger by rotating the vise handle.
        WARNING
        The tensioner must be compressed slowly or damage to the internal seals will result.

      4.  
      5. Once the tensioner plunger bottoms in the tensioner bore, continue to hold the ratchet lock mechanism and push down on the ratchet stem until flush with the tensioner face.
      6.  
      7. While holding the ratchet stem flush to the tensioner face, release the ratchet lock mechanism and install a paper clip or similar tool in the tensioner body to lock the tensioner in the collapsed position.
      8.  
      9. The paper clip must not be removed until the timing chain, tensioner, tensioner arm and timing chain guide are completely installed on the engine.
      10.  

    6.  
    7. Install the left-hand and right-hand timing chain tensioner guides on the dowel pins.
    8.  
    9. Place the left-hand and right-hand timing chain tensioners in position and install the retaining bolts. Tighten the bolts to 15-22 ft. lbs. (20-30 Nm).
    10.  
    11. Remove the retaining pins from the timing chain tensioners.
    12.  
    13. Remove Cam Holding Tool T96T-6256-B or equivalent, from the camshaft.
    14.  
    15. Install the crankshaft sensor ring on the crankshaft.
    16.  
    17. Apply silicone gasket along the cylinder head-to-cylinder block and engine oil pan-to-cylinder block sealing surfaces.
    18.  
    19. Install or connect the following:

      Engine front cover carefully onto the dowel pins
       
      Engine front cover bolts, in sequence, in the following manner: bolts 1 through 7: 15-22 ft. lbs. (20-30 Nm); bolts 6 through 15: 29-40 ft. lbs. (40-55 Nm)
       
      Idler pulley in position and install the retaining bolt. Tighten the bolt to 15-22 ft. lbs. (20-30 Nm).
       
      Drive belt tensioner in position and install 3 retaining bolts. Tighten the bolts to 15-22 ft. lbs. (20-30 Nm).
       
      CMP sensor in position and install the retaining bolt. Tighten the bolt to 106 inch lbs. (12 Nm).
       
      Damper on the crankshaft. Ensure the crankshaft key and keyway are aligned.
       
      4 front oil pan-to-engine front cover retaining bolts and tighten in sequence in 2 steps: Tighten the bolts to 15 ft. lbs. (20 Nm); Rotate the bolts an additional 60 degrees.
       
      CKP sensor in position and install the retaining bolt. Tighten the bolt to 106 inch lbs. (12 Nm).
       
      CKP sensor electrical harness connector
       
      Power steering pump with 2 upper and 2 lower retaining bolts. Tighten the bolts to 15-20 ft. lbs. (20-30 Nm).
       
      Ignition coil and brackets on the engine front cover and install the bracket bolts. Tighten the bolts to 15-22 ft. lbs. (20-30 Nm).
       
      Ignition coil and capacitor electrical harness connectors
       
      CMP electrical harness connector
       
      Water pump pulley and tighten the bolts to 15-22 ft. lbs. (20-30 Nm)
       
      Radiator
       
      Negative battery cable
       

    20.  
    21. Refill the engine oil with the recommended type of engine oil and the correct amount.
    22.  
    23. Start the engine and check for leaks.
    24.  
    25. Road test the vehicle and check for proper engine operation.

      Click image to see an enlarged view

      Fig. Check the alignment of the timing marks as shown-2001-04 5.4L and all 6.8L engines



      Click image to see an enlarged view

      Fig. Install the timing cover and tighten the bolts to specification-2001-04 5.4L and all 6.8L engines

    26.  

     
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