Oil seal between governor and magneto

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Dave Downs
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Oil seal between governor and magneto

Postby Dave Downs » Sat Mar 13, 2021 9:08 am

While re-assembling the governor on my neighbor's Cub last summer I remember a round spring-loaded oil seal that went, I think, somewheres between the governor and the magneto. It twisted when I assembled it - was in a big hurry - and I put it on the list of things to do before the next mowing season. It leaks around the back of the magneto but not bad.

So today I'm looking through the parts list and not seeing any type of round oil seal.

Is my memory that bad? What am I missing?

Gary Dotson
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Re: Oil seal between governor and magneto

Postby Gary Dotson » Sat Mar 13, 2021 9:34 am

Yes, there is a seal there. TM tractor has it, it's listed under the governor section, #GV436

tst
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Re: Oil seal between governor and magneto

Postby tst » Sat Mar 13, 2021 10:12 am

seal needs to be installed to a certain depth or it will leak

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Dale Finch
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Re: Oil seal between governor and magneto

Postby Dale Finch » Sat Mar 13, 2021 11:30 am

Here is the seal from TM Tractors:
http://www.tmtractor.com/new/gv/436fp.htm
As Tim (tst) stated above, it needs to go a specific depth. And as you noted, the seal can invert itself, so make sure you lubricate it and install it carefully.
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Dave Downs
10+ Years
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Posts: 33
Joined: Sun Jul 17, 2011 10:19 am
Zip Code: 18923
Tractors Owned: 1937 F-20
1944 M
H w/Heisler OD & disc brakes
C
C w/Fast Hitch
SC w/Fast Hitch
450

Re: Oil seal between governor and magneto

Postby Dave Downs » Sat Mar 13, 2021 11:42 am

THANKS TO ALL!!!!

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Glen
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Re: Oil seal between governor and magneto

Postby Glen » Sat Mar 13, 2021 7:50 pm

Hi,
Here is some info, maybe you already know.
Clean the governor gear surface the oil seal runs on, it should be flat and smooth. If there is rust or it is rough, use fine sandpaper and smooth it.

Be sure the seal lip is facing ahead when you put the seal in.
Oil the seal rubber and gear surface when you put the seal in.
Also be sure the seal lip stays facing ahead as you put the seal over the governor gear surface.
If the lip and rubber turn backwards, it won't seal.
Don't hammer directly on a new oil seal, put something wood or metal on the seal.

There are tools people have made for driving the seal in to the right depth.
3 tools are shown in the post below. The 1st tool looks like it would work with the governor in place, the 2 tools lower on the page wouldn't work with the governor in place.

http://www.farmallcub.com/phpBB2/viewto ... =1&t=94801

tst has said on here that you can pack the front side of the oil seal with grease, to help keep the spring in place.

I don't know if you are removing the governor, if you are, the timing gears need to be turned to the right position.
Start by turning the engine to number 1 cylinder TDC before removing the governor.

There are timing marks on the idler gear, and the governor gear that should be aligned as you put the governor in.
There is 1 mark on the rear facing side of the idler gear, and 1 mark on the governor gear.
If you have the engine at number 1 cylinder TDC, the mark on the idler gear should be visible, looking in the hole from the rear, use a good light to see it.

Below are pics, the lower 3 are from TM Tractor.

The 1st pic shows the magneto or Battery Ignition unit drive, and the oil seal. The drive should be turned like in the pic when the engine is at number 1 cylinder TDC.

The 2nd pic shows the seal with the governor removed.

The 3rd pic shows the governor gear surface where the seal runs, at the right side of the pic. Sand it and smooth it if needed. 400 grit sandpaper is good.

The 4th pic is the governor gear. The timing mark is on the left side in the pic.

The 5th pic is the idler gear. The timing mark is on the right in the pic. :)
Attachments
Cub gov gear.jpg
Cub gov seal.jpg
Cub gov seal.jpg (19.86 KiB) Viewed 228 times
Cub gov gear 3.jpg
Cub gov gear 2.jpg
Cub idler gear.jpg


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