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Thread: new timing set

  1. #1
    cowboycadillac556 is offline Cadillac Owners Member
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    new timing set

    I am kinda learning as i go here and am trying to get my new timing chain in and am wondering what cylinder should be in "firing position"? please excuse my mechanical grammar or lack there of. I have read that #4 should be in firing position, does this make the marks line up? and also how should the distributor be set?


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  3. #2
    cadillac_al is offline Cadillac Owners Connoisseur
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    Re: new timing set

    Whew, it's been a while, but I'm positive #1 has to be at top dead center with both valves closed

  4. #3
    cowboycadillac556 is offline Cadillac Owners Member
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    Re: new timing set

    it might be helpful to know that the engine is a 74 472, also my heads are at the machine shop till friday and i am trying to get this done together before they come back.

  5. #4
    steelybill is offline Cadillac Owners Enthusiast
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    Re: new timing set

    On the 472/500 engines, when the timing marks on the chain sprockets are lined up, #1 is NOT at top-dead-center. It's on the exhaust stroke. You have to rotate the crankshaft 1 full turn (to the timing mark) to get the distributor timed to the #1 firing position.
    Kinda strange why it's that way, but even the firing order and cylinder numbers are different than most engines, with number one cylinder being on the right-front. Firing order FYI is 1-5-6-3-4-2-7-8

  6. #5
    cowboycadillac556 is offline Cadillac Owners Member
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    Re: new timing set

    will it run if I just line the marks up?

  7. #6
    BRUCE ROE is offline Cadillac Owners Fanatic
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    Re: new timing set

    Right, Cad lines up on cylinder 4. I wrestle the old timing marks to line up, then take the cap off the distributor & mark the exact position of the rotor to the distributor. The distributor to engine can be marked also to get you on the same tooth. But expect that to move a little due to the new chain (if the rotor is exact). Bruce Roe CLC #14630


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