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Engine locked up on Cub

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Tyler

10-18-2003 22:07:28




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After leaving my Cub sitting in my barn for 5 years I discovered that the engine is locked up. I have took the head and oil pan off. I have hit the pistons with a block of wood, tried to jack the pistons free with a jack, have used a lot of penetrating oils, and pulled it around and threw it in gear but it still wont break free. What else could I try?
Thanks in advance




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BIG JOHN

10-19-2003 18:21:13




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 Re: Engine locked up on Cub in reply to Tyler, 10-18-2003 22:07:28  
Usually there are only one or two pistons that are stuck. Drop all of your rods and attempt to drive the pistons up from the bottom. Two or three of them will probably come right out and you can concencrate on only the ones that are stuck. If you can, roll your crank out of the way so that you can use your block of wood and hammer to drive them down. This has worked for me in the past when I really had a tough one.

Good Luck

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Troy - MI

10-19-2003 18:20:57




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 Re: Engine locked up on Cub in reply to Tyler, 10-18-2003 22:07:28  
Last month I freed up an MD that I bought with a stuck piston. I soaked it for two months using every penetrant that I could think of (Kerosine, Diesel fuel, Marvel's Mystery Oil, Kroil, Vinegar, P.B. Blaster, Brake Fluid, Automatic Transmission Fluid, etc.). I also heard that you could fill the cylinder with diesel fuel, ignite it, and let it burn out to warm the cylinder. Then hit the top of the piston with a wooden block. I tried that about six times per day each weekend for three weekends. The engine wouldn't budge.
Finally, I took a sparkplug and broke the ceramic housing off. I had a steel grease fitting welded to the broken end of the sparkplug. I used some JB weld to paste the valves to the inside of the head (to prevent grease leakage into the head). With the head off, I scooped grease into the stuck cylinder until it was filled to the top. Then I replaced the head and tightened it. I attached the modified sparkplug to the fitting. After about five pumps of the grease gun, I could feel the piston start to move. It took very little effort to pump the grease. I believe that this method is quite safe as the grease tends to leak slightly past the piston and help lubricate the cylinder as the piston is pushed down.
Now the tractor runs very well. In fact, I just used it to brush-hog 5 acres this weekend. It sure is a good feeling to put an abandoned wreck back to work again! Good luck!

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Michael Soldan

10-19-2003 10:18:21




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 Re: Engine locked up on Cub in reply to Tyler, 10-18-2003 22:07:28  
Tyler, you didn't get a lot of response because you have done everything that any of us would have suggested. Don't try to turn the engine, but try to rock it back and forth so that if it does break free you can work the rust and corrosion up and down and eventually get it to the top. I have heard of jacking the rear of the tractor off of the ground and working the wheels back and forth eventually getting some movement in the pistons. Keep the penetrating oil on the pistons. My guess is that you had a good tight engine to begin with and hopefully you will get it free and it will not need a lot of work. There are lots of different penetrating fluids on the market, you may have to try a few. As for pounding on the pistons, don't over do it, you don't want rod damage, but a good jar will help. My best advice to you is to be patient, it took 5 years for the tractor to sieze up so a few weeks or months of penetrating oil is not out of reality. My son in law unsiezed a Massey 30 by soaking it with penetrating oil every time he walked by it and after about 6 months he rocked the rear wheel back and forth and it came loose...he had to put one new piston and a set of rings in it and it purrs..so patience, pennetrating oil and lots of luck...let us know how you make out.....Mike in Exeter Ontario

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Jonathan

10-19-2003 11:33:28




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 Re: Re: Engine locked up on Cub in reply to Michael Soldan, 10-19-2003 10:18:21  
I unseized a JD 50 that had been sitting outside for about 30yrs by jacking up the back of the tractor and rocking the back tires back and forth by hand after pouring diesel fuel in each cylinder. Be patient and don't expect instant results, but it should let go after a few days. In the case of the JD 50, it let go after 2 days. Don't be afraid of over doing the diesel fuel either, since you have the oil pan off the engine you surley don't have to worry about it mixing with the oil.

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Jimmy King

10-19-2003 18:04:10




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 Re: Re: Re: Engine locked up on Cub in reply to Jonathan, 10-19-2003 11:33:28  
Marvel Mystery Oil is about the best for this.



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