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#1
05-26-2018, 04:28 PM
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782 crankshaft oil seal
So, my 782 has the original KT17 series 2 in it. I'm having a problem keeping the front crankshaft seal in place..... When I got the tractor, the seal was leaking. So I ordered a new Kohler seal and when it arrived, I installed it. A few months later, more oil leaking.... all over the engine plate and coming from the front of the engine again. When I took everything off to get a look at the seal, it was out of the case and spinning with the crankshaft. I ordered another genuine Kohler seal, made sure the housing was clean and dry, and installed the new seal..... The seal goes in fine, nice and straight. It doesn't take a lot of force to get it into the housing, but it isn't loose enough to "push it" in with your hand either.
A week ago, same situation again. This time I coated the outside of the seal with RTV and put it into the housing. I let it sit overnight to dry completely before starting it. The next morning I started it and let it run without the PTO in place, so I could watch the seal...... It ran for about 15 minutes and everything was perfect, problem fixed! So I reassembled everything and mowed the grass..... when I finished mowing, guess what..... oil all over the engine plate again, coming from the front of the engine. So I'm at a loss for what to do next. The case looks fine, no nicks or gouges, the seal seems to fit like it should (other than coming out on it's own lol) in other words I feel like it's the correct part. The first replacement seal lasted a few months, basically all mowing season. The past two have lasted about 2 hours each. It's not a "hard" or time consuming job, but I'm very tired of doing it lol. Thoughts?
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1985 782 1974 Allis Chalmers 712S 1955 Allis-Chalmers WD45 
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#2
05-26-2018, 04:46 PM
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One possibility is the breather is plugged which causes to much crankcase pressure and the pressure is forcing the seal out.
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Tim Pap's 100 Restored 108 1211 Dual Stick 1050 Pap's 100 restoration thread - http://onlycubcadets.net/forum/showthread.php?t=47965
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#3
05-26-2018, 05:00 PM
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Travis 1993 Cub Cadet 2064 1988 Cub Cadet 2072 1980 IH Cub Cadet 782 w/CH20 1966 IH Cub Cadet 102 w/K301 1961 IH Cub Cadet O 1967 IH Cub Cadet 102 & 122     JD 2155 w/ 175 loader
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#4
05-26-2018, 05:20 PM
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If your 782 has the original engine in it, it is a series 1
if it is a series II, it has been replaced. Moot point, IIRR,they both use same pto seal behind the electric clutch. Also,IIRR the pto clutch keeps the seal from pushing out of it's bore. If your installing a rubber coated seal, it is to be installed dry. You might have a problem with the crankcase vent valve, in the valve cover and if it is not working properly,will allow pressure to build in the crankcase. It vents into the aircleaner so just follow the vent to the valve cover. They have 2 styles, a orange neoprene umbrella, or a thin metal reed valve. I believe the metal reed is the new style. Normally the oil seal is a snug fit in it's bore. I've not seen it, but it is possible either the seals are just a bit under size on the OD. or the cover bore where it lives it a bit large, or a combination of both. Now all that said, if some well meaning fellow has been using globs of silly-cone to retain the seals and has plugged the oil drain-back passage in the cover for the seal to return the oil from the pressure fed main bearing,--that might cause the seal to leak or push it out of it's bore. They are made to retain oil splash but cannot withstand #50+ oil pressure. Now that is about all I can think off the top of my old grey head, but it gives you some things to check.
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#6
05-30-2018, 05:46 AM
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At WOT, do you know how many RPM your at? Have you adjusted and throttle linkage or anything like that? I have had oil sticks pop out of a tight engine from revving just a bit to high from the added pressure. A governor being out of adjustment could cause this also
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Cooperino 100, 104,125, 126, 2x129's, 804, 1211, 1641
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#7
05-30-2018, 09:16 AM
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