M-18 front oil seal
 

Hey guys: It's been awhile I hope your all good. I dropped in to ask your opinion on the above mentioned oil seal. My seal is leaking so I removed the PTO to start the repair. Before disassembly I watched a video on YouTube that showed the seal should be installed about 3/32 in from the surface, mine was sitting about a inch in. How is that possible? Is there a lip to keep the seal from falling to the inside of the engine? Was it installed incorrectly or did it "walk" itself deeper into the casting? How do you prevent that from happening?

On our Cubs the PTO end is the rear seal so make sure to get the correct one. In the M18-M20 manual, on page 11.9, it says to drive it in to a depth of 5/32 (+3/64;-1/64). I use a piece of PVC pipe to tap it into place.


The manual is free to download if you need it here.

https://www.onlycubcadets.net/forum/...ead.php?t=4648

they will go deeper with age they loosen and will suck into the engine . i've run into a few that someone put a new seal in without removing old one

Thanks guys, As far as leaving the second seal in I thought it wouldn't hurt to leave it as long as the front seal is getting lubed? The seal in there now leaks so it should be ok. Pertaining to the right seal, I bought a seal kit from "I Save Tractors" I've never bought from him but he seems to have good prices. Quality remains to be seen? Has anyone one purchased from him before? Also thanks for the link for the manual Oak.

You don't want to starve the new seal of lube, remove he old seal.
:bigthink:

Very easy to remove the old seal, just screw in a drywall screw or something similar and yank it out with pliers, a slide hammer, etc. I wouldn’t leave it in there, personally.

No issues with any of the gaskets or seals I bought from IST here.

I bought my K301 master rebuild kit from him and it was perfect. He is knowledgeable and enthusiastic about these old tractors.

Casting ok??
 

I'm worried, the seal slipped right out I hope the casting is not wore if the seal was spinning with the crank.

What seal did you get ??

:bigthink:

My experience was the Kohler pto end seal fit too loose in the bore. I used a SKF 13734 and it fit much better.