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
   
   

   

   

   Fig. Copper link alignment-4.6L engine

   
   
   

   

   

   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.
   
   
   

   

   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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