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Old 11-06-2011, 03:43 PM   post #1 of 15
Cannon51
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Default Craftsman/Kohler 25hp oil leak

My brothers GT5000 has a major oil leak that I'm guesssing is the bottom oil seal though something seems to have leaking for a while. The pulley on the PTO is full of oil and there is caked crud on the oil filter side of the engine and frame. I'm going to pressure wash it and drop the deck to get a better look but if it is the seal should I pull the engine to replace it or do it from underneath? I could not find a sticker that gave the model number, maybe after it's cleaner. Is this a Command or courage?
Cannon
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Old 11-06-2011, 04:19 PM   post #2 of 15
Onan18
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Default Re: Craftsman/Kohler 25hp oil leak

That is a Kohler Command, model should be either a CV25 or CV730 I believe. I would pull the motor, those oil seals can be a real pain. What part of Georgia are you in, we may be neighbors. I live in Loganville, 30052. If you have any more questions you can PM me or call at 770-853-8389.

Joe
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Old 11-06-2011, 04:41 PM   post #3 of 15
Cannon51
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Default Re: Craftsman/Kohler 25hp oil leak

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Originally Posted by Onan18 View Post
That is a Kohler Command, model should be either a CV25 or CV730 I believe. I would pull the motor, those oil seals can be a real pain. What part of Georgia are you in, we may be neighbors. I live in Loganville, 30052. If you have any more questions you can PM me or call at 770-853-8389.

Joe
Rising Fawn 30738. 25 miles south of Chattanooga on I-59
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Old 11-06-2011, 10:00 PM   post #4 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Give that thing a bath!!! lol Its a great engine when running correctly. There's enough dirt on it to plant a small garden.
Good luck with the seal,,nothing really hard about it,,just allot of work to get to it.
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Old 11-06-2011, 10:01 PM   post #5 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Id power wash it...then make sure the oil filter is tight. Run it a bit, look for wet spots. Could be base gasket, oil filter base, head gasket...
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Old 11-07-2011, 10:17 AM   post #6 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Last night while I had it on the trailer I took it to the car wash and sprayed it off some. this morning I found the Kohler ID tag, it's a CV730S. I could see some trash under the shroud on the starter side but most disturbing was the air filter. The breather hose was out of the filter housing and the inside of the filter and housing was full of dirt.
That doesn't account for the oil leak but I am worried about the internal engine parts.
Cannon
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Old 11-07-2011, 12:13 PM   post #7 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Thats the worst I have seen,,lol. I would run it before getting into it too deep. If it sounds good,,fix it.
If you are removing the engine you might as well put a set of head gaskets on it,,,,,valve cover gaskets.

A carb cleaning wouldn't hurt it either. IMO---worth fixing up as long as no noise from rods /pistons.

I just rebuilt the same engine,,carb kit,head gaskets,valve gaskets all new seals and rings. Cost me about $200. I don't recall what I paid for rings.
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Old 11-07-2011, 12:37 PM   post #8 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

I checked the oil filter and it did not seem tight so I removed it, cleaned the oring and block surface and pored a Qt of oil in it. 15 seconds later it was running off the pto. I would think it's the seal or a hole in the sump. I doubt if a Qt of oil would get up to the sump gasket.
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Old 11-07-2011, 02:17 PM   post #9 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Sounds like the lower seal has fallen out...

Grab a new one, clean up the block where the seal goes in, mix up some JB cold weld and dab it on the OUTER RING of the new seal and tap it in place. Wait 24hrs before adding oil.

I put probably 25-30 PTO seals in CH and CV Kohler twins in 3 years...all of em had fallen out, fitment was too loose, the JB fix fixed em all.
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Old 11-08-2011, 09:18 PM   post #10 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

I got a change to work on the Craftsman a while this afternoon. I jacked it up and removed the deck and PTO. I must be the dumbest guy around because every electrical connector on these things is like a Chinese puzzle to me. Took me about 10 minutes to unplug the PTO. I got the belt off the drive pulley and dropped it down and there was the seal. Apparently it came down off the shoulder on the crank onto the pulley sleeve. Is there supposed to be about a 3/4 counter bore where this 3/8 seal goes, and if so do I drive it all the way up or flush with the bottom? I tried to get a picture but it did not turn out very well. I think I am going to reinstall the seal with the motor in place unless there is some reason not to.
Cannon
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Old 11-09-2011, 03:33 AM   post #11 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

You can put the old seal back in...but personally, in my eyes..its a failed part.

If it were me, Id grab a new seal, clean everything up with brake parts cleaner, dry it with a clean rag.

You will need to find a seal installer, something that slides over the crank, and is the same or just a hair smaller diameter than the seal. Lube up the new seal and crank, gently slide the seal up onto the lip of the crank making sure not to fold the fragile seal lip. Then work it up to the block...dab some JB cold weld onto the outer lip of the new seal and use your fingers to "start" it into the block.

At this point its about using a small hammer/mallet and the seal installer and alot of discretion and patience. You can destroy a seal with one bad blow. You want the seal to go in even and square all the way until it seats in the block.
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Old 11-09-2011, 11:38 AM   post #12 of 15
Cannon51
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Default Re: Craftsman/Kohler 25hp oil leak

The new seal is in. I spent a while this morning figuring out what to use for a driver. A piece of 1 1/2 pvc fit over the shoulder on the crankshaft and a 1 1/2 connector was close to the OD of the seal. I don't recommend this because hitting on PVC is not really a good thing to do. I coated the outside of the seal with a thin coat of JB cold weld got it started and drove it in (using a wood mallet and wearing safety glasses) until it seemed seated. I will wait until tomorrow to add oil as Red suggested and see if it holds.
Cannon
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Old 11-10-2011, 05:49 AM   post #13 of 15
Cannon51
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Default Re: Craftsman/Kohler 25hp oil leak

I woke up early this morning and put the new oil filter on and poured a Qt of oil in the engine. After about 15 minutes there is no sign of a leak. Later today i will top off the oil, reinstall the drive pulley, belt and pto before startup. I can't find the torque spec for the PTO bolt online and I don't have the owners manual, anyone know what it is?
Yesterday while the JB was drying I took the shroud off and cleaned an old mouse nest off the right cylinder, that cylinder had to be getting hot. I'm sure none of you have ever seen a mouse nest on an engine before so i made a picture.
Cannon
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Old 11-10-2011, 11:37 AM   post #14 of 15
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Default Re: Craftsman/Kohler 25hp oil leak

Quote:
Originally Posted by Cannon51 View Post
I woke up early this morning and put the new oil filter on and poured a Qt of oil in the engine. After about 15 minutes there is no sign of a leak. Later today i will top off the oil, reinstall the drive pulley, belt and pto before startup. I can't find the torque spec for the PTO bolt online and I don't have the owners manual, anyone know what it is?
Yesterday while the JB was drying I took the shroud off and cleaned an old mouse nest off the right cylinder, that cylinder had to be getting hot. I'm sure none of you have ever seen a mouse nest on an engine before so i made a picture.
Cannon
Wow thats a whopper of a nest. Good thing to get it removed.
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Old 11-10-2011, 12:20 PM   post #15 of 15
Cannon51
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Default Re: Craftsman/Kohler 25hp oil leak

I didn't see any oil dripping of the crankshaft after it set for a few hours so I put the drive pulley and PTO on. I torqued the PTO bolt to 55 lbs, just a guess. I added some fresh gas with seafoam drove it around a while and let it idle 30 minutes, then set in the garage for 30 minutes and still no leaks so I think it's fixed. Still need to put the air cleaner, deck and hood on. Thanks for the help.
Cannon
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