Friday, October 14, 2011

4.6L Engine Timing Chain replacing on 2005 Ford Explorer?


Timing Chain


Removal & Installation



4.6L Engine
Timing Chains
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2. Remove or disconnect the following:
    WARNING
    Since the engine is not free-wheeling, timing procedures must be followed exactly or piston and valve damage may occur.






    Front cover
    Crankshaft sensor ring from the crankshaft
  3. Rotate the crankshaft until both camshaft key ways are 90 degrees from the valve cover surface. Make sure the copper links line up with the dots on the camshaft sprocket.
  4. Install the special tools 303-380 and 303-413 on the camshaft.
  5. Remove or disconnect the following:

    LH timing chain tensioner
    RH timing chain tensioner
    LH and RH timing chain tensioner arm from the dowel pins
    Timing chains and crankshaft sprocket
    Timing chain guides
To install:

WARNING
Do not compress the ratchet assembly. This will damage the ratchet assembly.

  1. Compress the tensioner plunger, using an edge of a vise.
  2. Using a small screwdriver or pick, push back and hold the ratchet mechanism.
  3. While holding the ratchet mechanism, push the ratchet arm back into the tensioner housing.
  4. Install a paper clip into the hole in the tensioner housing to hold the ratchet assembly and plunger in during installation.
    NOTE
    If the copper links are not visible, mark one link on one end and one link on the other end, and use as timing marks.
  5. Install or connect the following:

    Crankshaft sprocket, making sure the timing mark faces forward
    Timing chain guides
    LH (inner) timing chain on the crankshaft sprocket, aligning the copper link with the dot on the crankshaft sprocket
    LH (inner) timing chain on the camshaft sprocket, aligning the copper link with the dot on the camshaft sprocket

    Click image to see an enlarged view
    Fig. Copper link alignment-4.6L engine


    Click image to see an enlarged view
    Fig. Left cylinder head bolt torque sequence 4.6L engine
    RH (outer) timing chain on the crankshaft sprocket, aligning the copper link with the dot on the crankshaft sprocket
    RH (outer) timing chain on the camshaft sprocket, aligning the copper link with the dot on the camshaft sprocket
  6. Make sure that the copper marks on the timing chain are lined up with the corresponding dots on the crankshaft sprockets and the camshaft sprockets.

    Click image to see an enlarged view
    Fig. Sprocket alignment-4.6L engine
  7. Make sure that the camshaft sprocket keyway is 90 degrees from the valve cover mounting surface.
    NOTE
    The LH timing chain tensioner arm has a bump near the dowel hole, for identification.
  8. Position the LH and RH timing chain tensioner arm on the dowel pins.
  9. Position the RH timing chain tensioner and install the bolts.
  10. Position the LH timing chain tensioner and install the bolts.
  11. Remove both the RH and LH retaining pins from the timing chain tensioner.
  12. Remove the special tools from the camshaft.
  13. Install the crankshaft sensor ring on the crankshaft.
  14. Install the engine front cover.

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