GX345 smokes on and off after cutting for hour

rodsignsAugust 21, 2013

Thought it may be getting hot, new water pump,thermostat, breather fins in crankcase,checked carb did not see anything. Quits smoking if you disengage mower. If you run on for more time at high throttle you will blow some oil. If you slow motor down to half throttle no smoking. Any suggestions.

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Sweet coolant smell or for sure oil smell? Did you mean the breather reed valves under the cover? Have you verified that the oil return at the bottom of the chamber is open? Head gaskets can by symptomatic such as this as well.

    Bookmark   August 22, 2013 at 12:51AM
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Reed valves is right. Oil return open. Ran two hours yesterday at little over half throttle for hour then opened wot ran for hour before smoke. Motor sound like well tuned airplane smooth then smoke. I seem to notice sharp turns or hill may be involved. But does on smooth straight. Cleaned

    Bookmark   August 23, 2013 at 10:38AM
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From here if you are not experiencing any external case leaks (could be anything as simple as a missing dipstick seal) I expect the start of a head gasket leak. That is of course assuming that we know oil is oil and of correct weight. The level of the sump remains consistent?

    Bookmark   August 25, 2013 at 1:36AM
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