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Allis Chalmers Discussion Forum
:

what gives?

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Terry in Pa

01-02-2004 15:32:34




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I tried to start my B tonight to let it run cuz i dont use it much in the winter. It lit right up and stalled on the second crank(normal), but when i tried to crank it over(hand start) it just was locked like a valve dropped in the cylinder. It didnt make ANY stange sounds before it shut off. It will rotate about 180 degrees and stops. The first thing i did was take out the mag. Still will not crank over the whole way. I pulled the valve cover off (with the hood still on) and looked around and all the valves look to be in place. Then I quit working on it because im too tired to mess with it to any great extent tonight and figgerd id throw a post out and ask the experts so I dont have to look real hard for the problem..thanks in advance Terry

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tractorboy

01-02-2004 18:47:41




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 Re: what gives? in reply to Terry in Pa, 01-02-2004 15:32:34  
Had an M farmall do the same thing once. It had a piece of carbon come loose and would not let piston break over. had to pull head to get at it.



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Dick L Question

01-02-2004 17:52:57




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 Re: what gives? in reply to Terry in Pa, 01-02-2004 15:32:34  
(It will rotate about 180 degrees and stops.) Have you been able to do this more than once? If so did you have to back it up to turn it the 180 degrees or would it start to turn after sitting a while? If you have to back it up I would pull the pan down and see if the oil pickup pipe is blocking the crank from turning.



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Terry

01-03-2004 05:38:52




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 Re: Re: what gives? in reply to Dick L Question, 01-02-2004 17:52:57  
I dont know what you mean by doing that more than once ,Dick. Its not completly locked,and will make roughly a half turn. If i put it in 3rd I can turn the engine backward by pushing on the tractor backward, then it stops again. It sounds like its hitting something solid. (?)



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Dick L

01-03-2004 09:34:10




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 Re: Re: Re: what gives? in reply to Terry, 01-03-2004 05:38:52  
That answered the question. You are turning the engine back wards and the engine stops both ways.
Pull the head first and if you dont find a valve head that broke off and stopping the piston you will find something like the oil pickup tube blocking the crankshaft. The head of a valve could break off and you will not be able to tell by lookin at the rocker arms. The valve stem is held in place by the keepers at the top of the valve stem. However you could check with a feeler gage under each rocker arm. They should be set in the range of .012 of an inch, use a .005 gage and check as you turn the engine over. If the valve head has broke off you will not be able to get a .005 gage to even start between the rocker arm and the valve stem. You can even tell which cylinder is the problem with the feeler gage. Remember the firing order is 1-2-4-3, on the compression stroke you can get a feeler gage between the rocker arms and valve stems over number one piston. After you find that number one will accept a feeler gage then turn the engine untill both rocker arms are up to there higest point on number two or second from the front and check with the feeler gage. The next set of rocker arms to move to there higest point would be number four or back toward the gas tank. Then back to number three. This can be done before you pull the head. Another way is to put air pressure in the spark plug hole on the compression strokes. If the valve stems are up on the compression stroke and the air comes out without building any pressure you have found the problem valve, if it is in fact a valve head problem.

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Eldon (WA)

01-02-2004 17:27:57




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 Re: what gives? in reply to Terry in Pa, 01-02-2004 15:32:34  

Did you pull the cover off the governor and take a look at the weights? It's possible that one let loose and is stuck in the timing gears....or a piece was laying in there from the past and decided to migrate. I had a C that did this....freed it up by putting tractor in 3rd and rocking it back and forth.



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stumpy

01-02-2004 15:38:15




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 Re: what gives? in reply to Terry in Pa, 01-02-2004 15:32:34  
try removing your spark plugs, you may have a cylinder full of gas. just a thought.

stumpy



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Terry

01-02-2004 15:43:53




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 Re: Re: what gives? in reply to stumpy, 01-02-2004 15:38:15  
did that already stumpy, thanks.



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