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Thread: Valve Lash

  1. #1
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    Valve Lash

    I'm replacing valve springs and conponents on my 99 HP 500's and am getting conflicting answers. Mercruser says 1/2 turn and a respective offshore engine builder says 1 turn whom I also bought the parts from. Whats your opinion?

  2. #2
    I hate the winter!! Platinum Member Vinny P's Avatar
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    I have always gone with the 1/2 - 3/4 turn. But anywhere around that mark will work o.k.

  3. #3
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    Good question, I had several valves that would not quite down until 1 turn. After 50 hours of running I plan on going back and setting them at 5/8.
    Tim T.

  4. #4
    Registered paradigm shift's Avatar
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    You will probably get several correct answer to this. I as did BadDog have a set of hyd roller lifters that would make noise unless set at 1 turn down. I have for years ran hyd lifters at 1/2 turn with no trouble. Crane said to run them at 1 turn. Check www.cranecams.com if you want and you will see they recommend 1/2 to 1 turn or .020 to .060 preload. Good thing about hyd is they are some what forgiving on adjustment.

  5. #5
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    Thanks for the replys I think I'll go 3/4 turn and be safe.


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