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Thread: ATC70 oil leak

  1. 06-15-2009, 10:55 PM #1
    Hayward
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    ATC70 oil leak

    I just overhauled the top end of my '85 ATC70 and when I cranked it up, oil was pouring out by one of the head bolts. I torqued all the nuts down and have all new gaskets. I can not figure what's up with the oil bypassing the lower left bolt. Any help ?
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  2. 06-15-2009, 11:18 PM #2
    Race Demon
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    sitting on the bike, the lower right should have a brass washer for a seal on it , I think thats what your talking about
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  3. 06-15-2009, 11:25 PM #3
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    KASEY
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    If Its On The Top ,, Yep The Brass Washer,,, If Its In The Gap Between The Head And Cylinder,,, The Oring In The Head Gasket Is Missing...
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  4. 06-15-2009, 11:28 PM #4
    Hayward
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    That's the correct bolt leaking. Problem is, I have not noticed any difference in the washers. I'll double check that brass washer. 3 nuts are cap-types and 1 is a regular hex head. I suppose that the one that should have the brass washer?
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  5. 06-16-2009, 12:36 AM #5
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    Daddio
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    Quote Originally Posted by Hayward View Post
    That's the correct bolt leaking. Problem is, I have not noticed any difference in the washers. I'll double check that brass washer. 3 nuts are cap-types and 1 is a regular hex head. I suppose that the one that should have the brass washer?
    Mine has cap nuts on all four head studs.
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  6. 06-16-2009, 01:55 AM #6
    Hayward
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    Thanks you All ! While bolting the valve/rocker cover on, I got the bright idea to add lock washers.?> ?. After looking for the brass washer you mentioned, it hit me what the problem was. After removing the lock washers, no leak problem. Thanks again and have a fun and safe ride ...
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