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mhavanti

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You did get their dissertation in writing then? One's word against another when it comes down to it if a factory finds the engine washed down. Can you prove they said it?

Get that non-sense in writing with two or nine witnesses. lol
 

John Fitzgerald

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I have had gas get into the oil on an older 17.5 hp briggs engine riding mower that was gravity fed from the tank. It happened because the fuel shut off solenoid failed, and pressure from summer heat in the tank caused the carburetor to flood, and gas to fill the crankcase. The positive solution was to install a good fuel shut off valve in the line, and shut off the gas several seconds before shutting the mower down. I didn't care to replace the solenoid. I think this could happen on any mower, but less likely on a mower that has the tank below the engine, with a fuel pump, unless the tank is filled to capacity and left that way inside a hot building or out in the sun.

If substantial gas is in the crankcase, the oil should be changed twice, running for a few minutes in between, and change the filter with the second oil change.
 

mhavanti

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Yes Sir John. That happens quite frequently on mowers with gravity fed. However, what this thread was about was combustion forced gasoline getting by the rings into the crankcase. If that is happening, that is a tremendous amount of ring leak plus the ring end gaps are probably so closely clocked that fuel isn't being held in the combustion chamber. If this is so, neither is combustion and combusted gasses would be black or brown, not green.

The fuel shut off should be installed on everything in the event service is required.

Max
 

John Fitzgerald

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Yes Sir John. That happens quite frequently on mowers with gravity fed. However, what this thread was about was combustion forced gasoline getting by the rings into the crankcase. If that is happening, that is a tremendous amount of ring leak plus the ring end gaps are probably so closely clocked that fuel isn't being held in the combustion chamber. If this is so, neither is combustion and combusted gasses would be black or brown, not green.

The fuel shut off should be installed on everything in the event service is required.

Max

If the ring gaps are aligned, one or both should move around the circumference of the piston and self cure the problem, unless both are stuck. Not very likely.
 
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