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No compression removed head -cleaned valves and checked pistons=poured liquid on top of pistons=did not leak past=cleaned valve seats=replaced head gasket=still no compression on any cylinder=could it be a timing problem between the cam and crank=thanks

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  • Donnie Wilson
    Donnie Wilson May 11, 2010

    yes.what engine do you have so I can tell you what to do?

  • Mike Turner
    Mike Turner Dec 23, 2013

    Els725 22hp model40h777

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Yes - I suspect your cam is 90 degrees out of time. This will have all the valve events happening at BDC rather than TDC - which equals zilch on the compression guage.

If the cam and crank are not marked, proceed from first principals - pick a cylinder. Position the piston at TDC on that cylinder. Rotate the cam until BOTH valves are off their seats. This is the overlap at the end of the exhaust stroke. The engine is now timed well enough to run - it cannot be more than 1 tooth out in either direction.

You will need to ensure that the ignition is timed also.

Posted on Oct 06, 2009

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Still nothing ,the valves are worn,head comes off

Compression does not tell you if a valve seals properly,
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1 Answer

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