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Ford 9N, 2N & 8N Discussion Forum

ANOTHER OVERHEATING PROBLEM

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ROBY

09-23-2003 19:20:47

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First let me say I'm new to 8n'in. I just bought mine 6 weeks ago. I have traced my overheating trouble to the fan belt slipping when the bush hog really loads. this is due to the small pully on the changed out (12v) alternator. My question is, after I change the pully to a larger size what is the correct size fan belt? Any help would be appreciated.

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Jim(FL)

09-24-2003 06:36:42

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Re: ANOTHER OVERHEATING PROBLEM in reply to ROBY, 09-23-2003 19:20:47

Roby I am concerned that you think "fan belt slipping when the bush hog really loads". Yes, I agree that the engine RPM will vary somewhat as the governor reacts to the increased engine load, but this should not cause the belt to slip. Only an increased load due to the water pump or alternator should cause this. The belt on my 8N (12 volt alt with a wide groove pulley) is very very very loose most of the time. (I don't like the tight turn at the alt. pulley causing early belt failure). I bush hog weekly in the Fl heat with absolutely no overheating problems. I would take a closer look at your cooling system. Rad - clean and working right? Pump - turns easily, not leaking, pumping good? Thermostate - installed, and opening correctly? Fluids - topped off and correct antifreeze misture? etc etc

I have heard over and over again - 8N cooling systems are "oversized". They are that way for good reason - if I where to pull a 2 bottom plow around all day, down here in FL during the summer, the cooling system better be up to snuff!!!!!

Look again, Jim

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Fast Ed Ohio

09-23-2003 22:14:18

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Re: ANOTHER OVERHEATING PROBLEM in reply to ROBY, 09-23-2003 19:20:47

I dont think that pully size matters, sounds like radiator fluid is leaking and causing belt to slip, dont know its not my tractor . You could be keeping the radiator to full , bad water pump, leaking hose, ect, antifreeze is very slippery .

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ROBY

09-24-2003 05:36:52

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Re: Re: ANOTHER OVERHEATING PROBLEM in reply to Fast Ed Ohio, 09-23-2003 22:14:18

Well thats interesting, because the tractor shop say's they always change the alternator pully to the same size as the crank and water pump because you would have to use a small belt to accomodate the alt. pully. As a result it will slip when under heavy load.....makes sense to me. Any thought? Thanks

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Dell (WA)

09-24-2003 06:44:00

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Re: Re: Re: ANOTHER OVERHEATING PROBLEM in reply to ROBY, 09-24-2003 05:36:52

Roby..... ....yer tractor shop guys are correct, the N-Fanbelt is 5/8 WIDE and you need to change your alternator pulley to accomodate the wider belt. Don't change to narrow belt because your waterpump or crankshaft pulley won't transfer belt energy. Remember, its the SIDES of the V-Belt that transfers energy. Most 12 volt conversion kits include a 5/8 pulley. (but I don't remember the diameter). And I don't remember the necessary belt length eather, use a piece of string to measure the length, should gettcha close..... ...Dell

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David - OR

09-24-2003 06:41:06

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Re: Re: Re: ANOTHER OVERHEATING PROBLEM in reply to ROBY, 09-24-2003 05:36:52

A Vee belt pulley is specified for diameter and width of the belt that it takes. If you are having overheating problems due to belt slippage, it is not because the alternator pulley is wrong, but because the belt is wrong.

The stock fan belt is a 5/8 inch wide belt. Stock GM alternator pulleys take a 1/2 inch wide belt. You must either change the alternator pulley to a 5/8 wide unit, or run the 5/8 inch wide belt "high" in the groove of the 1/2 inch wide pulley.

One thing that some people try, that might well create this issue, is to use a 1/2 inch wide belt (to suit the alternator) on the 3 pulley system. This would ride too low on the crank and water pump pulleys, and that arrangement might well slip.

Measure the width of the outside of your Vee belt. If it is 1/2 inch, there is merit to your "belt slippage" theory. If it is 5/8ths, and can be tensioned correctly by the alternator, it should spin the fan and water pump without trouble, even if the alternator pulley is "wrong".

I did a home-brew conversion. My solution to this issue was to buy a "conversion pulley" for the use of a Delco alternator on a Ford Flathead V8. This costs $14.95 and takes the stock 5/8 wide 8N tractor fan belt. It's about the same diameter as the standard Delco pulley. I chose to design the alternator mounting arrangement to tuck the alternator in tight to the engine, but still accept the standard length belt. A competent "kit" vendor should have done the same.

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ROBY

09-24-2003 18:56:58

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Re: Re: Re: Re: ANOTHER OVERHEATING PROBLEM in reply to David - OR, 09-24-2003 06:41:06

Thanks to all!
I have received some great sugestions and have decided on FIRST.... just changing the width of the fan belt to 5/8". Leaving the alt. pully at 1/2". Makes sense if the crank and water pump pully are 5/8" then the belt on the alt. pully may ride a little high....but heck it's just charging the battery. If that does'nt work then I'll change the alt. pully. THANKS TO ALL!!!!

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