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Allis B Overheating Problem

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Steve Miller

07-28-1999 21:08:40




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My Allis B has started overheating over the past year. I have replaced the radiator, put a new thermostat in, flushed the block, removed and inspected the water pump, and reset the timing. Nothing has changed. If I let it idle it can run all day but when I use it to mow it overheats in about 20 - 30 minutes. It has a 50" belly mower that we have run for 6 years with no trouble.

I am stumped. Has anybody run into this before?

I also checked the compression, it has 80 - 85 psi on all cylinders, plugs look normal and no water in oil.

Thanks in advance for any help you can provide. Please respond to my e-mail address [email protected]

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Gordon

08-13-1999 12:58:25




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
I read the comments. I agree that you should check the hoses. The lower one can collapse (either the whole hose or only the inner ply. On the upper one, the inner ply can collapse as well. I assumed that the rariator was new, if not (as was suggested) it should be checked. If new, make sure that it is the proper type (as was suggested). Timing: Do you have a mag. or a distributor? If a mag., did you set the timing by hand cranking the engine with the impulse coupling at 0 degrees (DC mark) or with the engine running at full speed on the advanced (30 degrees) position (FIRE mark)? Check it both ways. A weak or broken impulse spring can cause the engine to run with retarded spark at high speed. It should check out both ways! For a distrbutor, check it both ways also. A stuck mechanical advance (in the base of the distributor under the points mounting plate) can cause retarded spark at high speed. Retared spark at high speed will cause the engine to run hot. Hope this helps, Gordon

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B.C.

08-03-1999 06:04:19




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
It has been my experience that over time nearly every radiator clogs or fouls up. The cheapest fix has been to take it to a real radiator shop and get it checked out and rebuilt if necessary.

Replacing the thermostat every year or two is cheap insurance and if you pull the radiator you should sure do it then too. That's also a good time to at least get the radiator cap checked or replaced.

Cooling systems are like your teeth: They are at their best when they don't need any work and it can get tempting to think that they never will.

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lonny

08-02-1999 12:41:25




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
It's probably too late for this post but change your radiator cap. For $5.00 this can make a difference. I don't know if it is your problem, but I had a car that would overheat and tried everything, and a wise man told me to change the cap. It worked. Lonny



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Darrell

07-31-1999 07:01:28




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
something else to look at is the number of cores the radiator has. we a B,C, and an engine that came off a #60 combine, and the B and C both have three cores, but the combine one only has two.
just something to think about.



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Rick Hester

07-30-1999 05:43:17




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
Steve,

This suggestion may sound stupid, and may be stupid because I am new to the old tractor scene. Reading the service manual on my Model B suggests that the fan pulley on the water pump should be adjusted so that the fan rotates 15 times for every 11 times that the crank pulley rotates. Maybe yours is adjusted improperly, and you are not getting enough air flow through the radiator while you are mowing.

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Dick in NW Ohio

07-29-1999 09:46:43




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
If you replaced it with a used radiator it needs to go to a radiator repair shop. You just don't have proper flow.



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Doug Morrow

07-29-1999 06:01:14




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 Re: Allis B Overheating Problem in reply to Steve Miller, 07-28-1999 21:08:40  
Don't know if there is sufficient pressure in the tractor to do this but I had a similar problem in a car once. It turned out that the hoses had softened and were closing under pressure and heat. It might be worth looking into.



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