Timing chain install

Small Block Mopar Engine

  1. David Eldridge

    David Eldridge Well-Known Member

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    Getting ready to put a new chain on my 318. Any recommendations for holding the cam while torquing the bolt down, or just let the chain hold it and hold the flywheel?
     
  2. flyfish

    flyfish C8H18+N2O = :-D

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    With 35 ft-lbs, I doubt it would move much.....I'm a horrible person, and have never torqued that bolt on my motors. I just get it tight by hand (NOT saying that is the right thing to do...its just is what I have done).
     
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    • AJ/FormS

      AJ/FormS 68 B'cuda fb, Form S clone ... 367/A833/3.55s FABO Gold Member

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      Usually the sprockets have holes in them..... and the front of the block does too; which you can figure out how to use as anchors.
      But 35pounds won't hurt a double-roller chain if you use the crank.
      If you use a factory type nylon coated sprocket,well IDK, I've never done that.
       
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      • nm9stheham

        nm9stheham Well-Known Member

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        IMHO: Clean the cam sprocket bolt threads and the mating hole in the cam, and use a bit of blue locktite on that bolt. A little extra torque won't hurt.
         
      • jbc426

        jbc426 Well-Known Member

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        Before installing the chain, soak it in synthetic gear oil on it's side overnight. Even better, warm the gear oil so it soaks in faster. It will wash out as your hot engine oil works its way into it.

        That stuff has tripled or quadrupled my chainsaw's chain life, and virtually eliminated chain stretch on the last few motors I've built.
         
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        • David Eldridge

          David Eldridge Well-Known Member

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          Unfortunately the new gear doesn't have the small holes for the holding tool to go in so I'll probably have to rig something
           
        • David Eldridge

          David Eldridge Well-Known Member

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          Thanks for all the input everyone!
           
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          • Krooser

            Krooser Reform School Graduate

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            Use a large screwdriver to pry a bit between the block and cam sprocket..
             
          • krazykuda

            krazykuda Well-Known Member FABO Gold Member How-To Section Editor

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            I usually set the timing marks on the gears on a work bench before installing, then carefully bring it to the engine without letting it skip a tooth... Put the crank gear on the key way and then turn the cam so the key way for the cam sprocket lines up...

            Then check afterwards to verify the timing marks are properly lined up after installed up on the engine...

            Especially with no heads on the engine, the cam will turn freely so you can line up the key way with the chain set to the sprockets...
             
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            • RustyRatRod

              RustyRatRod 30 Degrees Outta Whack FABO Gold Member

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              I'm even worse. I put a couple drops of Locktite on and run it down with a 3/8 impact.
               
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