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John Deere Tractors Discussion Forum
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fanshaft gasket

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Jon Hurley

04-07-2008 13:38:39




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I am restoring my 1941 B. I have removed the grills, hood, gas tanks and radiator thus far. I am looking at replacing the gasket where the fanshaft goes into the governor. Since I have enough room now, can I remove it from the governor assembly and pull it forward? Will I run into any issues with the gears in the governor? From looking at the parts manual and the I&T manual, it looks pretty straight forward. I plan on leaving the governor alone and intact on the case. Thanks for any advice.

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EdM

04-08-2008 17:14:41




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
almrm;
You might want to check on that price again. There's a good chance that you were grossly overcharged and can get a refund. Deere made massive pricing errors last month and after I had my dealer check into it, a lot of prices came down to earth. Those gaskets should only be $2 to 4$. What is the part # ?



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jd b puller

04-07-2008 20:13:50




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 Re: fanshaft gasket in reply to johndeeregene, 04-07-2008 13:38:39  
Good point Pat, (although I'd keep 2nd guessing myself the whole time...) :D



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Jon Hurley

04-07-2008 14:41:23




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
Though I have done well with the disassembly so far, I guess the governor makes me nervous. The procedure in the I&T manual is pretty straight forward. I guess my main concern is not getting it back in time correctly. That and I have little reliable/trust worthy help. So far this has been all on my own, and probably will remain that way. Thanks for the info thus far.



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jd b puller

04-07-2008 17:52:30




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 14:41:23  
John, one other thing, when you take the governor off, make sure you take the mag off. You have to pull the cover on the flywheel side to retime it. It's spring loaded. If you try to put the cover back on with the mag in place, odds are the lugs on the mag won't be lined up with the lugs on the governor shaft. You'll get the cover on and either destroy the bearing in the mag, or you'll wreck the whole mag. I was lucky the first time I did it, only killed the bearing...

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PBrowning

04-07-2008 18:53:18




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 Re: fanshaft gasket in reply to jd b puller, 04-07-2008 17:52:30  
Sir -- there's no need to pull the L.H. Governor Bearing Housing cover for timing. With No. 1 piston at TDC, set governor down so that the magneto drive flange slot is horizontal. That's all there is to it (PatB)



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PBrowning

04-07-2008 15:19:05




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 14:41:23  
Jon -- timing is the least of your concerns. All you need to do when you reinstall the governor is have the engine with its No. 1 piston at TDC, then place the governor down into mesh with the cam gear such that the slot in the magneto drive flange is horizontal an you are home! I sure wish you had the Restoration Guide! All of this stuff is in there.(PatB)



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Jon Hurley

04-07-2008 14:24:17




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
thanks for the great info once again Pat



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Jon Hurley

04-07-2008 14:22:38




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
Though I haven't taken it apart yet, I'm not sure how many if any shims I am going to find. It appears that at some point someone used a liquid type gasket as they used a bunch and there is some squished out the one side. If I take the mag off then the left hand side of the governor assembly, will I be able to see the mesh of the gears with a light? I don't have much movement of the fan blade, maybe a 1/2 to 3/4 of an inch.

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PBrowning

04-07-2008 14:08:28




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
What a great time to ask -- before you go in there -- wise man! Go to the JD-H site (below), and whence there, scan across to ARTICLES 2, and from the drop-downs, select GOVERNOR. Pages 2, 3 and 4 are pretty much "H" preculiar, but the part you want to settle back and study deals with the "Governor Fan Shaft Interface" Enjoy! (PatB)

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Mark-IA

04-07-2008 14:01:02




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 Re: fanshaft gasket in reply to Jon Hurley, 04-07-2008 13:38:39  
Those gaskets are shims. They are available from John Deere. You need to put the same amount back in as you took out, or use the original shim pack. Without the right amount of shims installed, the gov. gear and fanshaft gear won't mesh correctly. You will have premature wear and a howling noise from the gov. area.



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almrm

04-08-2008 09:15:41




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 Re: fanshaft gasket in reply to Mark-IA, 04-07-2008 14:01:02  
I just put the governor and fan shaft together on a 1950 A. Additional shim gaskets were needed for the housing cover. I went to my Deere dealer and ordered 2 thin shims and they were $15 a piece. The package of 10 stated in the parts book was not available according to my dealer. They were not enough. I should have ordered medium shims. I made the additional shim gaskets I needed, which ended up being 3, from medium gasket material. I changed the bearing in the cover which is why it needed additional shim gaskets. I am sure this can be done on the tractor particularly if bearings are not being changed. It is better if you can remove the housing and fit the gears on the bench. It allows inspection to insure the gear heels are lined up properly. It also allows you to determine the true gear lash for the fan shaft to the governor beveled gear without picking up the governor to cam and cam to crank gear lash. Yes, you can insulate the other gear lashes on the tractor somewhat, but it is simple on the bench. A governor to case gasket is $10. The timing marks were clear on the two units I have done so far and, as stated, there are other methods for timing. Mine has 1/2 inch play at the tip of the fan blade which I am pleased with on 58 year old gears. I used the procedure from Pat Browning's guide to properly set the gears. (I doubt he and others would support the use of homemade shim gaskets in this critical area but I am confident the pack is stable. The 3/8 cap screws on the cover are torqued to their proper levels.)

Thanks Pat. You and others are helping many more people than you know from advice and references you give on this board.

Mark

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