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Flaw with unfreezing stuck engine with hydraulics

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Bob in SE Nebra

04-21-2002 09:35:16




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I have just finished tearing down my super m engine that was stuck. The method of breaking the engine loose by attaching a hydraulic hose to spark plug holes and forcing hydraulic fluid into the cylynder had been used. This method actually did work but I noticed a pretty loud knock when the tractor was started. After tearing down the engine, I found it had one very bent rod. I just wanted to let everyone know that this can happen.

This is the third stuck tractor engine that I have had to deal with and I am convinced that the process of tearing down the engine and starting over is by far the best way to go. All kinds of methods have been brought up about how to free a stuck engine and I know that in some cases those methods do work. I just wanted to say that some very bad things can happen inside that engine when a teardown isn't done to fix the problem. Lucky for me the damage isn't too bad and with some parts I can bring my tractor back to life.

Sorry for the long post but I thought it may help someone avoid costly problems.

Bob

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Thanks for the reminder - Dan Kelley

04-21-2002 20:05:22




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 Re: Flaw with unfreezing stuck engine with hydraulics in reply to Bob in SE Nebraska, 04-21-2002 09:35:16  
I've got a Case VAIW (in addition to my Farmall M), and the motor is stuck in it. Thanks for this reminder. I'll still hydraulic the pistons out, but first I think I'll see if I can drop the crank. I need to rebuild the motor anyway (it used to smoke), and this way I'll save my rods.

See "A Memorial to David" in "Your Stories" for more about this tractor.



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Jailkeeper

04-22-2002 18:55:53




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 Re: Re: Flaw with unfreezing stuck engine with hydraulics in reply to Thanks for the reminder - Dan Kelley, 04-21-2002 20:05:22  
Keep in mind if you take the crank out then apply
hyd. pressure to the top of those pistons, when
they break loose they are going to be MISSILES!!
There will be no way to tell when that piston is about to come loose and you could have several hundred PSI on top of it. You could risk breaking the block if the piston and rod come flying out of the cylinder. My .02, use a sledge and block of wood to drive it out.

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sod

04-22-2002 00:09:09




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 Re: Re: Flaw with unfreezing stuck engine with hydraulics in reply to Thanks for the reminder - Dan Kelley, 04-21-2002 20:05:22  
I may be out of line... but I always thought the name of the group that rebuilt the old warbirds was called the 'Confederate Air Force'. Please forgive me if I am wrong, but if someone was involved, he would know what the name was.
sod



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Dan Kelley

04-23-2002 14:25:01




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 Re: Re: Re: Flaw with unfreezing stuck engine with hydraulics in reply to sod, 04-22-2002 00:09:09  
It used to be called the Confederate Air Force, but that was not politically correct. So, they changed things to the Commemorative Air Force. Same thing, though.



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Bob in SE Nebraska

04-21-2002 20:23:42




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 Re: Re: Flaw with unfreezing stuck engine with hydraulics in reply to Thanks for the reminder - Dan Kelley, 04-21-2002 20:05:22  
Good luck with the stuck engine. I have been fortunate to have recovered all three tractors that had stuck engines. Nice story about the Case and David and I am sure you would like to see that tractor in a parade some day.

Bob



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Dachshund

04-21-2002 18:56:47




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 Re: Flaw with unfreezing stuck engine with hydraulics in reply to Bob in SE Nebraska, 04-21-2002 09:35:16  
Bob- Where in SE Nebraska are you? I am in Polk, but the farm is near Tecumseh.



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Bob inSE Nebraska

04-21-2002 20:09:08




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 Re: Re: Flaw with unfreezing stuck engine with hydraulics in reply to Dachshund, 04-21-2002 18:56:47  
Nebraska City. I no longer farm but still have the tractors that we had as I was growing up. My biggest crop now is sweet corn! Looking forward to Arbor Day celebration this weekend which is our first since moving to Nebraska City.

Bob



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Steven@nd

04-21-2002 09:51:51




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 Re: Flaw with unfreezing stuck engine with hydraulics in reply to Bob in SE Nebraska, 04-21-2002 09:35:16  
I agree. My way of dealing with stuck engines is this: First, check the oil - if there is water you have problems, if there is no oil you have problems, if it has oil, good. Then I remove the spark plugs - if there is any major rust on any of them I remove the head to inspect things. If none of the spark plugs have rust on them I remove the valve cover to be sure that ALL the valves are loose to avoid a bent pushrod if the engine does come loose. If all valves are loose I then pull the tractor on gravel or grass with another tractor and ease the clutch out while in 4th gear (or 1 gear below road gear). I proceed to disengage and engage the clutch about 10 times - if the engine hasn't come loose by then It needs to be taken apart to see what is making it stick. I have had 3 stuck tractors this year and the 2 I have kept have had to been taken apart to unstick - resulting in broken sleeves and broken pistons to get them loose even at that point.

Hydralic pressure works for single cylinder engines like the stationary engines I also work on. When you have multiple cylinders and more than 1 is stuck then you risk bending connecting rods or breaking the crankshaft.

Steven

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