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305SS

loosing power revisited

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305SS
About one year ago I ask everyone what they thought it was. tractor would run great for an hour and fall on it face. After alot of check and recheck and not check the obvious because I thought it could not be that it runs to good other wise. Well check your valves for clearance, my intake had none exhaust was fine. Just thought you would like to know. Thanks for every ones help!

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HubbardRA
Glad to hear you found the problem. I have had that problem three different times so far. Just recently had to put clearance in the exhaust valve on my AC 713S. Over years of operation, the head of the valve can beat the effective working area of the seat down farther into the block and eventually remove all of the clearance. The clearance is necessary to keep the valve seated when the engine gets hot and the valve stem expands.

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