after having my engine rebuilt it ran for 2 hours and quite. the mechanic claims that contaminated fuel caused incomplete combustion; an accumulation of raw fuel in the cylinder which caused the connecting rod to bend. Is this pssible or is it a snow job?
yanmar yse12 is it possible?
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yse12
hello rob, i assume it has been disassembled to come to this conclusion. just an opinion, to bend the rod, the cylinder had to to be filled with enough liquid to stop the piston (or cause severe detonation but the detonation would most likly break the piston or rings before bending a rod). while the engine is running, this is difficult to do because can only happen on its up compression stroke. each time the piston operates its exhaust stroke, any unburned fuel(and water contaminants) will be blown out the exhaust pipe. a build up of fuel to a rich condition would tend to shut the engine down rather than lock it up. if engine compartment was swamped while running, then you could have filled the induction system with enough water to do it, but you would have an instantly dead engine. i have dribbled water into a running engine to see what would happen (after i read about fighter aircraft using water injection on takeoff,to prevent detonation). with the engine stopped, an electric fuel pump not turned off, could put enough fuel in the system to,on start up, lock the engine up. this would be a more likely thing to have happen. once you clear the cylinder of excess fuel the engine could possibly run,if the piston or rings havent been broken, even with a bent rod. but you would still have to get it inspected and repaired to have a trustworthy engine good luck john
hello rob, i assume it has been disassembled to come to this conclusion. just an opinion, to bend the rod, the cylinder had to to be filled with enough liquid to stop the piston (or cause severe detonation but the detonation would most likly break the piston or rings before bending a rod). while the engine is running, this is difficult to do because can only happen on its up compression stroke. each time the piston operates its exhaust stroke, any unburned fuel(and water contaminants) will be blown out the exhaust pipe. a build up of fuel to a rich condition would tend to shut the engine down rather than lock it up. if engine compartment was swamped while running, then you could have filled the induction system with enough water to do it, but you would have an instantly dead engine. i have dribbled water into a running engine to see what would happen (after i read about fighter aircraft using water injection on takeoff,to prevent detonation). with the engine stopped, an electric fuel pump not turned off, could put enough fuel in the system to,on start up, lock the engine up. this would be a more likely thing to have happen. once you clear the cylinder of excess fuel the engine could possibly run,if the piston or rings havent been broken, even with a bent rod. but you would still have to get it inspected and repaired to have a trustworthy engine good luck john
Rob, the first thing for you to do is
to get a sample of your fuel as close to the entrance point of your engine as possible. Have a witness who can be shown to be unbiased and maintain a chain of evidence. Pinning this on the mechanic is almost impossible. It would be even harder than bending a rod on a diesel engine. Good luck. But make the most of it. Take a look at that little puppy. See how easy it is to do your own work if needed? Lots of owners can do their own tear downs. Putting it back together correctly is not that hard. Ask around for knowledgeable people if you are unsure. Of course, if you have never had grease under your fingernails, I'm talking to the wrong guy. Keep your check book handy. Again, good luck.
to get a sample of your fuel as close to the entrance point of your engine as possible. Have a witness who can be shown to be unbiased and maintain a chain of evidence. Pinning this on the mechanic is almost impossible. It would be even harder than bending a rod on a diesel engine. Good luck. But make the most of it. Take a look at that little puppy. See how easy it is to do your own work if needed? Lots of owners can do their own tear downs. Putting it back together correctly is not that hard. Ask around for knowledgeable people if you are unsure. Of course, if you have never had grease under your fingernails, I'm talking to the wrong guy. Keep your check book handy. Again, good luck.
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