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Farmall & IHC Tractors Discussion Forum
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M overhaul?

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Ray

03-07-2004 14:39:06




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I have an M that I picked up for $1,000 four years ago along with a Model 31 (I think) sickle mower. I use it to cut about 80 acres of hay. Last year the M lost compression and it turned out that a retaining nut had came off of one of the valve springs. I replaced it and the compression returned but the tractor still smokes pretty bad. Not sure what the problem is. My uncle says that it may have a cracked ring. Would it still run decent if that were true. I am thinking of rebuilding it unless you guys can help me solve this problem. Thanks alot for you help!
Ray

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Steve

03-07-2004 17:12:02




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 Re: M overhaul? in reply to Ray, 03-07-2004 14:39:06  
Ray,
Did it smoke before you had the valve trouble? Does it foul the spark plugs to the point you need to change them?



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Ray

03-07-2004 19:37:23




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 Re: Re: M overhaul? in reply to Steve, 03-07-2004 17:12:02  
Yes, it did smoke a little prior to the breakdown. It also would foul one plug (same cylinder)occassionally. I haven't noticed it fouling the plug anymore than usual though and it smokes more than it did. Thanks.
Ray



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Steve

03-07-2004 20:37:44




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 Re: Re: Re: M overhaul? in reply to Ray, 03-07-2004 19:37:23  
Just curious, was it an intake or exhaust valve spring retainer? It's been awhile since I had an "M" apart, but I wonder if the intake valves have rubber seals around the guides. I looked in my 450 parts book. It doesn't show them being used, but I think in the last fel-pro gasket set I used, they were included. I really don't believe that oil leaking by the valve guide will foul a spark plug. I think you may be dealing with 2 different problems here. Chances are that you have worn/stuck rings or worn sleeves, or both. Either way, you're probably looking at an overhaul and a valve grind. I like to have things running right, but it's a tough choice....add oil and change a couple spark plugs, or possibly upwards of $1000 for a complete overhaul. That's my thoughts. Good Luck.

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Ray

03-08-2004 04:50:35




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 Re: Re: Re: Re: M overhaul? in reply to Steve, 03-07-2004 20:37:44  
Steve,
Thanks for the advice. I'm not sure on the rubber seal but I will check. I believe an over haul is probably needed I was just wanting someone to talk me out of it (ha ha). I appreciate your time.
Ray



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Steve

03-08-2004 14:08:45




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 Re: Re: Re: Re: Re: M overhaul? in reply to Ray, 03-08-2004 04:50:35  
Ray,
No problem. I too have a couple of the plug foulers. I just don't use them enough to justify an overhaul. I know exactly where you're coming from. Good Luck on your decision.



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