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Fan shaft

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Play Farmer

01-19-2002 05:38:09




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I need to replace the bearing on the fan shaft on my 1948 A. Can anyone tell me the steps I need to take to do this? Now for the scary one. The gasket between the head and the exhaust manifold is leaking!!!!! Of course what I am worried about is breaking off bolts in the head. Any ideas?? Thanks for the help in advance you all seem to be very generous with your expertise.




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Will P

01-19-2002 20:11:58




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 Re: Fan shaft in reply to Play Farmer, 01-19-2002 05:38:09  
John T told you not to drill too far or you will hit the push rod tubes. Well, the A don't have push rod tubes. Only the B. If you drill to far you will hit the casting and the head will be junk.
Also, go to Deere and get the studs. It is a little expensive, but they wont go in to far and hit the casting and ruin the head.
And yes, use stainless steel nuts and lock washers on the studs. Works great! After 2 years the head gasket went out on my B and I had to remove the manifold, and it came right off.

My 2 cents.

Will P

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LOn

01-21-2002 13:42:00




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 Re: Re: Fan shaft in reply to Will P, 01-19-2002 20:11:58  
Damn! Then what was all that brass that came up my drill bit when I drilled out the studs on my '37 A?

I don't know about newer styled A's, but unstyled A's (and I would guess at least the '39 styled-since it is basically the same tractor with sheet metal added) have the pushrod tubes in them and, yes, they can get drilled when removing manifold studs. I speak from experience-at the time, they were $17 each from Ma Deere.

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Will P

01-21-2002 21:20:30




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 Re: Re: Re: Fan shaft in reply to LOn, 01-21-2002 13:42:00  
OK. But for his 48 he won't hit brass.
Heat them up first and you wouldn't have to drill then.



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JD675X7

01-21-2002 13:47:59




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 Re: Re: Re: Fan shaft in reply to LOn, 01-21-2002 13:42:00  
LON;
The late A didn't use push rod tubes, the early ones did. 488800 was the about the time the tubes went away.



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John T

01-19-2002 11:28:39




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 Re: Fan shaft in reply to Play Farmer, 01-19-2002 05:38:09  
Dear Farmer, what you have isnt my favorite job but we all have to do it sooner or later. First of all, to remove that fan shaft either the radiator needs to go forward (hell of a job) or the governor raised. If you raise the governor, dont forget theres that governor oil line up underneath you have to remove thats accessible by removing the top crankcase cover. Also, dont forget you have to get the governor gear back on where it was in time. If you install a new fan shaft bearing (one at the governor?) and if the fan shaft/governor bevel gears (a matched set) are not worn out sharp, you have to set the bevel gears and proper backlash by using the different thickness gaskets on the fan shaft and governor bearing end cap. Now for the hard part. To remove the manifold studs, I heat them cherry red and that usually gets them off but usually the studs are then stuck corrodded to the mainfold. If you can get the manifold off and the studs still remain intact (prayers and swear words combined may help), I heat (NOT the studs it softens them) the head all around the perimeter of the stud and they may unscrew (doubt it if real corroded) So if you break them you have to drill and retap and dont drill too deep because you may get into the pushrod tubes. Its also possible the pushrod tubes may be corroded and leaky and might need be replaced but that requires removal of the head. Anyway, I would have the manifold milled smooth while its off, install new grade 8 studs, and use stainless steel nuts and lockwashers and anti sieze for reassembly. This is work, even typing and recalling all the work involved has me wore out. Good Luck Ol John T in Indiana

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Play Farmer

01-19-2002 16:03:24




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 Re: Re: Fan shaft in reply to John T, 01-19-2002 11:28:39  
Thanks for the advice. I think I am more scared now then before!!!!! Anyway thanks again I will let you know how I come out, might be asking for more advice. I am building fence with this tractor now so it will be awhile before I attempt this. Thanks



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Tony

01-19-2002 12:24:27




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 Re: Re: Fan shaft in reply to John T, 01-19-2002 11:28:39  
Tell you another trick too. Take a light ball peen hammer and tap lightly (not just once-a couple of light continuous blows) on top of the stud/bolt to break the rust. A little bit of your favorite penetrant will help. Then if that fails try heat. Remember be gentle. Hot wrench should be last resort.



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