2004 3.7L timing not correct?

Discussion in 'Jeep News' started by ovurtyme, Oct 6, 2016.

  1. ovurtyme

    ovurtyme New Member

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    I am rebuilding my 2004 liberty 3.7L. I installed new pistons had heads cleaned and inspected. valves and seats lapped they machined heads but went to 4.580-4.584. (Low to minimum). After installing heads and new timing set I tried to rotate crankshaft manually to verify smooth operation an found that I could only go about 45 degrees before intake valve contacted #1 piston. Then rotated back counter clockwise and intake valve is contacting #2 piston. I have set all timing marks EXACTLY AS MANUAL INSTRUCTS, right and left cams with v6 marks at12:00, idler gear mark at 12:00 and crankshaft gear mark at 6:00. All marks on new chains are correctly located. WHAT'S GOING ON HERE??? I am baffled! Any thoughts?
     
  2. renegade 04

    renegade 04 Full Access Member

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    does the manual state you need any special tools?
     
  3. TwoBobsKJ

    TwoBobsKJ Full Access Member

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    The crankshaft mark is actually at about 2 o'clock or so - you have the cams in the right spot but I believe the crank is the problem child.

    Bob
     
  4. Logan Savage

    Logan Savage Full Access Member

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    I recently installed a crank kit in my 02 . Installed timing chains just as OP described . Crank gear dot at 6 , idler gear dot at 12 & cam gears with V6 at 12 . Turned fine & runs fine . Are you sure the pistons are hitting the valves ? A rod cap installed backwards will cause problems . Did you use stock pistons ?