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Farmall M overheating.

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Farmall Daddy

07-07-2003 08:18:18

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I have a problem with my '49 M that keeps overheating. If I go down the road in road gear, full throttle, it stays fairly cool. I was out yesterdays doing light, light work, and it got pretty hot. The motor in it has been bored out to a 4 1/8 piston, with a 450 head, and shorter valves. When I put my hand on the grill, there seems to be no air movement, but the fan blows enough air back when you stand back by the carb. I was thinking on putting a 6 bladed fan on it to keep it cool. When shut down, it cools down rather quickly. The radiator is full, but I am running just plain water in case I have to flush it out. Any suggestions? Any help is appreciated! Thanks!

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MarkNOhio

07-07-2003 19:15:55

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Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 08:18:18

Some good thoughts here from the other guys. The only thing that I can add is to put a thermostat back in it. Sometimes the water pump actually pumps the water through the radiator too fast for it to cool properly. A thermostat helps slow it down and transfer more of the heat to the tubes/fins. A quick check to see if the fan is drawing enough air through the radiator is to cover the grill with a sheet of plastic temporarly. At any speed much above idle the fan should suck it up really tightly against the grill and hold it there. Are your hoses in good shape? Not collasped internally? Every M or H I've been around has a tendency to run almost too cool unless something was wrong.

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Farmall Daddy

07-08-2003 12:16:20

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Re: Re: Farmall M overheating. in reply to MarkNOhio, 07-07-2003 19:15:55

I was thinking the same thing with the hoses, and I replaced them all so those couldn't be the problem. I will try the thermostat idea, and I hope that it works. Thanks for the help guys!!

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g pop

07-07-2003 18:19:56

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Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 08:18:18

you might want to check your water pump

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FC Andy

07-07-2003 14:11:09

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Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 08:18:18

Dose it have Radiatior shutters? If you closed them on accident, this would heat it up. Just a thought.

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Farmall Daddy

07-07-2003 17:22:08

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Re: Re: Farmall M overheating. in reply to FC Andy, 07-07-2003 14:11:09

No it doesn't have shutters on it. Good thought though.

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Dan

07-07-2003 12:05:42

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Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 08:18:18

I don't think these usually run that hot, especially doing light work. You might want to check to see if radiator is plugged, that would account for no draft on the front. Might also check timing as that will make them overheat. Check fan belt to be sure it is turing fan sufficiently. Could also be that thermostat is stuck but think it would overheat all the tme then. It will probably run hotter as you have thinner cylinder walls.

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Farmall Daddy

07-07-2003 13:19:54

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Re: Re: Farmall M overheating. in reply to Dan, 07-07-2003 12:05:42

We removed the thermostat before we bored the motor out. We put some radiator acid in it, and it helped a little. The radiator was cleaned about 3 months before we bored the motor. The motor also only has about 5 hours tops on it. The timing is right on as well. The fan belt is fairly tight, and it turns the fan as fast as it should. It blows a lot of air back, but there is barely air movement through the grill. I flushed the radiator out by removing the drain plug at the bottom, good water flow outwards, with the hose filling it at the top as well. Then I removed the plug on the side of the block, good flow also, and I know that water is getting there because cold water would follow after I put the hose and filled the radiator while letting it flow out through the block. I took the temp gauge out w/ the radiator cap on and water cam out. Tried it w/ radiator cap off, and it flowed even more.

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Jim

07-08-2003 07:33:32

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Re: Re: Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 13:19:54

Put the thermostat back in. The coolant is flowing to fast threw the radiator to cool it.

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Farmall Daddy

07-08-2003 12:13:53

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Re: Re: Re: Re: Farmall M overheating. in reply to Jim, 07-08-2003 07:33:32

Are you sure? I never have heard of that. I will give it a try though. Thanks for the unthinkable idea!!

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49 Cubber!

07-07-2003 14:05:25

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Re: Re: Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 13:19:54

I think he means the outside of the radiator.If the radiator is clogged up from dirt,leaves,etc,itll run hot.

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Farmall Daddy

07-07-2003 17:31:22

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Re: Re: Re: Re: Farmall M overheating. in reply to 49 Cubber!, 07-07-2003 14:05:25

Nope, the entire radiator is clean, and I can see right through the lined up holes that enable air to move through it. Do you guys think that if I take the grill off, it might help it? What do ya think? Thanks!!

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Delbert

07-07-2003 17:48:31

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Re: Re: Re: Re: Re: Farmall M overheating. in reply to Farmall Daddy, 07-07-2003 17:31:22

Just a thought is it possible the fan blade is on backwards? This will move air but not pull it through the radiator can,t remmeber if is possible to reverse these or not. I have a m that is bored out like yours and don,t have any problems. I think it has the m head i just had it overhauled last winter.Used it on mower conditioner today temp about 95 or so didn,t hardly get off the cold mark just into run like most of them run. Not much help sorry might need to run some more cleaner through it. Hope you find the problem.

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Farmall Daddy

07-07-2003 18:43:49

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Re: Re: Re: Re: Re: Re: Farmall M overheating. in reply to Delbert, 07-07-2003 17:48:31

Thanks for the thoughts though. I will stop at the local NAPA and get another can of it, and try that. If that works, I will put antifreeze in it, and put the additive conditioner to make it run cool. Thanks!!

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