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Kohler 8.5 RMY leaking oil

Started by 47sawdust, December 26, 2022, 04:55:47 PM

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47sawdust

Owned this generator for 5 years,less than 300 hours.Never an issue.The motor is a Kohler CH-20.
It ran for 72 hours straight in our latest power outage.
It has developed a big oil leak.
Don't know where to start.
Help appreciated.
Will call Kohler in Wisconsin in the morning.
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

bigblockyeti


doc henderson

The worst leak we had on one time was my wife having to start it while I was at work.  came home to my wife in her robe and house shoes and two neighbors trying to help.  It would not start so I had her check the oil as it was low oil protected, and she did not get the cap back in.  If this is in a big, enclosed chasse, it may be harder to track down.  may have to do some cleaning first.  but check the oil plug, and dipstick if it has one.  and the filter area.
Timber king 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor powered by a 12 volt tarp motor

GRANITEstateMP


After checking Doc's suggestions, I'd check the oil cooler lines if it has an external cooler
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Kubota M6040
Load Trail 12ft Dump Trailer
2015 GMC 3500HD SRW
2016 Polaris 450HO
2016 Polaris 570
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sawguy21

What @doc henderson said. You need to clean it up the best you can and watch for leaks after it starts. With any luck it is just the fill cap or a valve cover gasket.
old age and treachery will always overcome youth and enthusiasm

barbender

Check your crankcase breather. Idk about your particular engine, but a lot of breathers will freeze shut in cold weather operation. Then crank pressure builds, and oil will push out of your main seals. I've had that happen on an 8hp Honda, and a Chevy Duramax😊
Too many irons in the fire

47sawdust

Thanks for the replies.It is an enclosed unit so today I'll pull the covers and clean it up and proceed from there.
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

47sawdust

Pulled the covers off,removed the air filter and the found the breather tube surrounded by what looks like congealed mayonnaise.No cracks in the tube will give everything a thorough cleaning before re assembly.
Waiting for a call back from the dealer I have a service contract with but I know his list is long.
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

barbender

The congealed mayo can be caused by an oil/water mix (mostly water). The conditions we just came out of are perfect for icing up those breathers, but if it is an enclosed unit I would think it would hold enough heat to keep it from icing. It will be interesting to see what your dealer says.
Too many irons in the fire

doc henderson

Timber king 2000, 277c track loader, PJ 32 foot gooseneck, 1976 F700 state dump truck, JD 850 tractor.  2007 Chevy 3500HD dually, home built log splitter 18 horse 28 gpm with 5 inch cylinder and 32 inch split range with conveyor powered by a 12 volt tarp motor

47sawdust

Doc,
Yes the oil level was low.I sure hope I dodged a bullet there.I cleaned everything up changed the oil and filter set a drip pan under the crank seal and gave it a test run.
It ran well with no obvious leaks,but time will determine that.
I am embarrassed for not being more vigilant about the oil level.
I don't know how people get away with leaving generators running unattended for long periods of time.
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

barbender

 If it was from the breather being clogged, you could've checked the oil before you started it and had it shut down from the low oil level safety 2 hours later. Once they build pressure, the oil pushes out the main seal quite quickly.
Too many irons in the fire

47sawdust

Well as it turned out the crankcase pressure built up and pushed the dipstick loose slinging oil over the whole engine.
An extra push is needed to fully seat the dipstick.This is an older model and the dipstick design has been changed.
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

barbender

If it is pushing the dipstick out, either your breather is plugged, or you have a lot of compression blowby.
Too many irons in the fire

sawguy21

That's right, there should be a slight vacuum in the crank case of a healthy engine.
old age and treachery will always overcome youth and enthusiasm

47sawdust

I am not experienced with internal workings of standby generators.I spoke to a local Kohler  Generator
dealer who services all types of standby generators.We had a 3 day power outage in this area recently and he said he saw a lot of generators of all makes with filthy oil enclosures after continuous use.His impression was it was caused by atmospheric conditions.
The dealer who services my generator says this model of kohler engine was known for blowing oil out the dipstick and that Kohler changed their design.His opinion was it was better to blow it out the dipstick than blow the crank oil seal.
Heck if I know!
Mick
1997 WM Lt30 1999 WM twin blade edger Kubota L3750 Tajfun winchGood Health Work is my hobby.

Machinebuilder

I had a similar thing with the Kohler on my mill. it looked like it was leaking oil but it was blowing out the crank case breather.

A friend suggested it had a stuck ring and to pull the plug and fill the cylinder with diesel, let it soak then turn it over a few times, put the plug back in and start it.
Make sure to change the oil before starting it.

It seems to have worked.
Dave, Woodmizer LT15, Husqvarna 460 and Stihl 180, Bobcat 751, David Brown 770, New Holland TN60A

Al_Smith

I don't know if this would apply but I've seen the crankcase breather tube plug up .Some so badly the pressure would build up to the point it pushed oil right past the crankshaft seals .One case on a Tecumseh engine it blew the seal out . What caused that I have no idea .

sawguy21

I saw that frequently. The end of the tube ices up in the airbox and pressure builds in the crank case. I would let the hose hang free (and risk destroying the ozone layer all by myself) then duct tape the hole in the airbox to keep snow out.
old age and treachery will always overcome youth and enthusiasm

Al_Smith

Those crankcase tubes have been used a long time .I've got some Briggs engines I know go back to the 60's that have them .Some go into the breather some to the manifold/carb .

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