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2003 Ford Explorer 4.0L engine. Timing chain replacement.

Discussion in 'Stock 2002 - 2005 Explorers' started by darspencer, October 22, 2010.

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    1. darspencer

      darspencer New Member

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      I hope someone here can help me. I am changing the timing chains in this engine and i am about to lose it. I have been to the library, on the internet, bought the manual and i just don't get it. Does anyone have a step by step diagram that they will be willing to share with me. I would be so grateful for any help.::mad:
       
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    3. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      Sohc v6?

      I assume that you have the SOHC V6 engine. Are you attempting to replace both cassettes and the primary chain? If so, have you removed the engine from the vehicle?
       
    4. darspencer

      darspencer New Member

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      Yes...trying to time it without the special tools, I need to know the cam positions.
       
    5. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      timing cam positions

      CAUTION: If the camshafts or crankshaft are rotated with the chains out of time or disconnected then the pistons can interfere with open valves.

      rotate crankshaft until #1 piston is at TDC

      right camshaft should have timing slot below axis of camshaft and parallel to head surface that mates with valve cover

      cam1.jpg

      left camshaft should have camshaft "nub" for camshaft position sensor above axis of camshaft and timing slot below axis of camshaft and parallel to head surface that mates with valve cover

      tools1.jpg
       
    6. darspencer

      darspencer New Member

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      2003 Ford Explorer XL Timing Chain 4.0

      Thank a lot man. i really appreciate it.
       
    7. BrooklynBay

      BrooklynBay Staff Member Moderator Elite Explorer

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    8. jmcgarvie

      jmcgarvie New Member

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      dose it matter

      ok i timed the same engine with the cams upside down from the way you describe but if you turn the engine over 360% it is the other way dose it matter when there is no distributor
       
    9. mdumalaog

      mdumalaog New Member

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      the pic with the timing chain that is for the cylinders 4,5,6, correct? with the piston no. 1 at top dead center compression stroke?
       
    10. 2000StreetRod

      2000StreetRod Staff Member Moderator Elite Explorer

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      left vs right

      left (driver) side of engine are cylinders #4, 5 & 6.
      right (passenger) side of engine are cylinders #1, 2 & 3.
      left camshaft has the camshaft position sensor "nub"
      Timing of both camshafts is with #1 piston at TDC on compression stroke.
      Timing slot of camshafts (left & right) below axis of camshaft and parallel to head surface that mates with valve cover.
       

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