Question about Gcv160 Gas Engine

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Lawn mower following fuel in filter and exhaust and checking the float and reassembling the carb the pull cord won't deploy

I have tried to pull the cord with the spark plug out and still it is stiff. I have tipped the machine to see if there is any fuel coming out of the spark plug hole and there is nothing. I have sprayed penetrating oil into the spark plug hole and left it and still the cord won't pull. I have drained what could be contaminated oil with fuel in it out and replenished with new oil. The brake seems to be deploying properly and was working prior to the fuel in the filter etc. The coil works off the mower it is only when it is on the engine that it will not deploy, so it is not jammed. I cannot believe that a stuck float can cause such catastrophic damage to the cylinders. I cannot understand what could be impeding the pull unless the engine has seized. I didn't hit anything prior to the fuel leakage. I had managed to cut my back lawn. The carb was cleaned last year by a professional and serviced by a professional that is why I cannot understand why the float was sticking. It seemed fine when I took the float bowl off the bottom of the carb. This is the first time I have used the machine this year, it lasted all of about ten minutes. Any suggestions would be greatly received because I cannot believe such a simple problem can cause so much damage.

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Hi Julie,
There's a penetrating catalyst (oil) called "BLASTER". Anything that may be causing the engine to freeze up, that can be desolved, broken loose or washed away... This stuff will get it done. You can get it at any auto parts store. Try that in the cylinder.
Also, Try back tracking what you've done. If the engine began acting frozen after you installed the carb, take the carb back off and see if the engine will turn over without it. If for some reason air doesn't flow through the carb, the engine will appear to be frozen and won't allow the exhaust valve open to complete the cycle.
Let me know what happens. I'm interested to find out. Have a good morning,

Posted on Apr 03, 2015

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  • julie Perry
    julie Perry Apr 03, 2015

    Hi Bill, Thank you for your advice. I have taken the carb off but it is still stiff. My husband and I have looked after this mower for ten years and it has been a good work horse, sadly my husband died last year and it was his baby, so I will endeavour to get some of this BLASTED. I am in France at the moment so it could be a interesting conversation, or they might have the equivelent. I will keep you posted. I think the thing that has bugged me is why the float stuck when it was serviced last year and the carb cleaned. Thanks for your help! Julie

  • julie Perry
    julie Perry Apr 03, 2015

    Okay an update. I have just been down to the local lawn moer place and they don't think that fuel driping through the filter and exhaust would cause damage to the engine. I could pull the cord not problem at all when fuel was leaking out of th efilter so it does beg the question what the hell is impeding the pull, unless it is in actual fact the blade. I had to pull it backwards becasue the grass is so long so maybe i have damaged the blade underneath. Either way everything is solid as a rock. They don't do penetrating oil here for engines. I asked and he looked at me as if Ihad come off another planet. He wants to see the machine. He is intrigued that the motor could be ruined from just fuel seeping into the filter and exhaust. So, I think I might have to take it in and have it looked at.



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