Farmall B Fan squeals, cheap fix? Photos

David Inman · Jul 24, 2012

Another question with photos regarding the B. Is there a cheap fix to eliminate the squeal in the Farmall B fan? The photos show what we have.

mkirsch · Jul 24, 2012

The bearings are probably shot from lack of lubrication. All you can do is replace it and make sure to keep it lubed properly in the future.

Anonymous-0 · Jul 24, 2012

As far as I know nobody makes a repair kit for it. I know of four places that have that fan assembly and they run from $70.00 to $120.00 depending who you buy it from.A good machinist could rebuild it but you would have more money in it than just going ahead and buying a new one.

David Inman · Jul 24, 2012

Ok. Let me ask this, any one know the correct Inner diameter of the bronze thrust washer (photo 1) (ordered top to bottom)?

or, what keeps the fan hub (photo 2) from moving in and out along the fan spindle? To us, our problem seams to be that because the fan hub moves in and out along the spindle, it allows the thrust nut with oil tube (photo 3), to rub against the fan (photo 4)?

Finally, we are somewhat worried about the seal behind the weld in the pulley assembly failing, but we see no reference to it in the parts book. any chance we can grind the plate off, find a number on the seal, get a replacement, and weld the back back on?

Jim Becker · Jul 24, 2012

I don't know the dimensions of any of the internal parts of that fan hub. I doubt that anyone else will be able to post them either. But nothing in there is particularly high precision. You should be able to measure existing parts to decide what size washer you need. Looks to me like the major problem is that nobody has oiled it in the last several decades.

You need to clean the bearing surfaces off then decide if the bushings/shaft are a tight enough fit to reuse. You should be able to decide what size/thickness the thrust washer needs to be. It needs to be thick enough to eliminate excessive end play but thin enough to assemble.

Forget about a seal on the back end of the shaft. None is listed in the parts catalog because it isn't needed. It does need to be oiled, as explained in the owner's manual.

Be sure to put it all back together correctly so it doesn't come apart. If it fails, the fan could hit the radiator.

gene bender · Jul 24, 2012

Just get a new assy as that piece is a great piece of engineering that went bad because of NO MAINTENENCE. making new parts is not just great as the shaft is probably worn also. Ive only been around those systems since 4 and when they are shot replacement is needed just do it too many yrs of no oil when needed thats why its bad now. This was another area that needed general upkeep to keep the tractor running. Does a few drops of oil work in the mag and when was oil added to the gen and starter. How about grease to the throw-out bearing. Is the final filled to the correct level also the tranny. I read the manual whe the B was new in 47 as per fathers orders as that was my tractor and being 12 yrs old why not that why the tractor is still running today with original stuff. Its been over hauled with new sleeves and pistons.

David Inman · Jul 24, 2012

Jim, when you say the thrust washer should be "thick but thin" do you mean how thick the metal is, or the distance by which the washer stands above the hub.

All, What I am failing to understand is WHAT dose the bearing have to do with the end of the spindle rubbing on the back of the fan? Shouldn't the two be far enough apart that they don't rub?

SDE · Jul 24, 2012

I don't remember exactly how I repaired the fan on my "C", but I installed two small bearing on the shaft and bored out the pulley assembly for the bearings. I have not had a problem since then. I am a machinist and I will spend way to much time re-engineering a cheap part than to buy another. I do it as a challenge to see if i can.
SDE

Jim Becker · Jul 24, 2012

(quoted from post at 21:16:39 07/24/12) Jim, when you say the thrust washer should be "thick but thin" do you mean how thick the metal is, or the distance by which the washer stands above the hub.

All, What I am failing to understand is WHAT dose the bearing have to do with the end of the spindle rubbing on the back of the fan? Shouldn't the two be far enough apart that they don't rub?

Too detailed for me at this point. It has been a long time since I have had that type hub apart. Maybe someone else can answer or you have to figure it out on your own. Keep in mind Gene's comment on shaft wear. If the shaft/bushing combo has too much wear, you need to replace it.

Farmall B Fan squeals, cheap fix? Photos

David Inman

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mkirsch

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Anonymous-0

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David Inman

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Jim Becker

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gene bender

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David Inman

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SDE

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Jim Becker

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