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Cub flooded

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Kevin (FL)

12-28-2004 21:55:05




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We've been using one of our "working Cubs" quite a bit around here lately--towing a small wagon or the log splitter. After shutting it down for awhile this afternoon to do some more log cutting, I went over to crank it up but it was dripping gas out of the carb. I figure it must be the needle has some trash or something on it so I shut the gas valve and remove the intake hose. Naturally, gas poured out of the carb. I tried to turn the engine over with no ignition and the engine stopped cold while cranking. It seems that a bunch of gas was in the intake manifold. I let it sit and will take the plugs out on Wednesday, might also change the oil too. I've seen this happen on diesels before except water was in the engine and saw it actually bend connecting rods. I'm hoping this didn't happen to the C60 engine. Anyone ever had this happen--heavy flooding and then the engine stops while cranking? Ever damaged anything--rods or ?? or maybe blow a head gasket or something? Hoping for the best but I thought I'd ask what my chances were of no major problems from the gas being in the cylinders. Thanks for any help or input.

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John M

12-29-2004 14:49:18




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 Re: Cub flooded in reply to Kevin (FL), 12-28-2004 21:55:05  
As mentioned I seriously dought that the cylinder got full.You probably eiother burnt up a switch on the starter or the end got hot and isnt making a good conection now.Check you battery cables.



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Bus Driver

12-29-2004 05:23:43




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 Re: Cub flooded in reply to Kevin (FL), 12-28-2004 21:55:05  
Take a look at how far UP from the carburetor the liquid gasoline would have to travel to fill a cylinder of that engine. Seems unlikely to happen. "Flooding" usually refers to a fuel-air mixture too rich to ignite with a spark. "Hydraulic lock" is when a cylinder is filled with liquid.



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El Toro

12-29-2004 03:20:46




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 Re: Cub flooded in reply to Kevin (FL), 12-28-2004 21:55:05  
Hi Kevin, It's possible that you may have bent a rod, but I doubt it. I would pull all the plugs and crank the engine over with the ignition switch
off. I would blow air over the plugs with with an air hose to dry them off. I would squirt engine oil into the cylinders and crank the engine
over to coat the cylinder walls, then I would squirt a little more oil into the cylinders and then reinstall the plugs. I would then see if
the engine will start.

If that carburetor is still dripping fuel, I would put a kit in that carb and you may need to disassemble it and soak it in carb cleaner. Have a Happy New Year, Hal

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Kevin (FL)

12-29-2004 20:50:57




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 Re: Cub flooded (update) in reply to El Toro, 12-29-2004 03:20:46  
Thanks guys for the help. Removed all four plugs today, squirted a little oil in the cylinders, spun her over, tapped on carb to loosen float, hooked the gas back up, cleaned,gapped & reinstalled the plugs and she fired right up. Oh I forgot to mention that I noticed gas pouring up the exhaust pipe when I tried to crank it on Tuesday. Also, I noticed that the manifold had a rust-through (or burn-through) hole in the forward lower section. Installed a sheet metal screw in the hole for now.

To address the hydraulic lock question--if the needle and seat don't work, and the gas tank is full, gas will continue to flow into the carb and flow into the intake hose. When the engine is cranked over, the vacuum will pull the gas "column" up the intake manifold and into the cylinders. The engine definitely stopped dead in its tracks when I tried to crank it over. Just happy that she's running again. Lord knows I don't need more work to do around here. We split and stacked more firewood tonight. One day, I'll take a photo and post. One of the racks is about 80 or 90 feet long, stacked about 5 feet high. Between that one and the others, spread around the property, I think we're up to about 8 cords cut and stacked. All we need now is some of those arctic clippers....

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El Toro

12-30-2004 03:48:37




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 Re: Cub flooded (update) in reply to Kevin (FL), 12-29-2004 20:50:57  
Hi Kevin, Glad you got your tractor running. I
think you should change that engine oil since it
may have become diluted from the gasoline.

I would keep that gas shut-off in the closed position when the tractor is sitting idle.
It doesn't take much dirt or rust to keep that needle valve from seating. The float somtimes get pin holes in them, causing them to sink and the fuel continues to flow into the engine. Hal

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Kevin (FL)

12-30-2004 06:28:02




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 Re: Cub flooded (update) in reply to El Toro, 12-30-2004 03:48:37  
Thanks El Toro--I was planning to do that today. As for the gas shut-off, I do that on all the tractors around here at the end of the day, but this one messed up during a brief shutdown while working. Like you said, must've been a piece of trash or something that got into the line. Tank isn't in the best of shape either. Thanks again and have a good New Year's and God Bless.



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