Front crankshaft pulley installation position

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Dale Finch
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Joined: Tue Apr 27, 2010 11:34 am
Zip Code: 27517
Tractors Owned: '51 Cub #140966 "Bruno" with Woods 59 mower
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'55 Cub #191739 "Bertha" with Woods 42 mower
'56 Cub #194370 "Boris" with Mott Flail mower
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Location: NC, Chapel Hill

Front crankshaft pulley installation position

Postby Dale Finch » Wed Jun 12, 2019 6:55 pm

I have frequently read questions asking "how do I know the front pulley is all the way on?" Having done a front seal replacement, flowed by the reinstallation of the pulley, I was fortunate to have had the oil pan off during the process. I was thus able to see exactly when the pulley was fully seated, which is when it is bottomed out against the Crankshaft Pinion, #7 in the following illustration:

At the recent Barnyard Bash, I noticed an engine sitting on a pallet with the oil pan off, and realized it was a great opportunity to show both the front part of the pulley you are looking at during installation, as well as the rear (inside) end of the pulley. So I snapped a few photos. Hope these help you if you are doing this in the future!

The first photo shows the area of the pulley shaft that has a reduced diameter and would normally be bright and shiney, since you would have cleaned the shaft since it rides on the seal. There is between 1/8-1/4" (sorry, I didn't measure it) gap, which often leads folks to think the pulley is not fulley seated. For reference, you are looking from the bottom of the engine, with forward to the right.

The 2nd photo is from slightly aft of the first, so you can see the shaft of the pulley is hard against the Crankshaft Pinion (gear). This also would have been nice and shiney for a seal replacement.

The last 2 photos are two closer views of the outside rear of the pulley, just to give you a better look at the remaining gap between the wider portion of the pulley and the engine cover.


As I said, I hope these help you if you ever need to tackle a front seal replacement. Don't forget that the manual says to leave the cover loose (bolts not tigbtened down) until you have installed the pulley, allowing the cover/seal to center itself on the pulley.
Dale Finch
Circle of Safety

5+ Years
5+ Years
Posts: 173
Joined: Wed Nov 04, 2015 5:43 pm
Zip Code: 27041
Tractors Owned: ---------
1948 Farmall Cub #56596
1950 Farmall Cub #101608
1950 Farmall Cub #106823
1955 Farmall Cub #188789
Location: NC, Pilot Mountain

Re: Front crankshaft pulley installation position

Postby Clubless » Wed Jun 12, 2019 7:37 pm

Thanks for posting these pictures as they are a big help to me.


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