Kohler Command Pro 29hp EFI ECV860 Smoking

Fizzerpilot

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Since day one... this motor has blown an oil smoke cloud on startup. I’ve only got 5 hours on the motor now... but I’ve never experienced this with a new mower. I purchased from Caldwell, and a call to them is probably coming soon. Has anyone else experienced this? Searching the inter webs, it seems I’m not the only one...
 

Luffydog

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Yes seen it happen on brand new ones as well. Is yours using oil? Kohler's fix to that they say run 20w-50. I have also seen Kawasaki also smoke as well brand new as well as Briggs but kohler seems to be the worst of them.
 

Fizzerpilot

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So, I checked and it was overfilled with oil. So, I suctioned oil from the crankcase to bring it into the operational range. I also noticed the oil is murky green, which is apparently break in oil used by Kohler.
 

ILENGINE

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So, I checked and it was overfilled with oil. So, I suctioned oil from the crankcase to bring it into the operational range. I also noticed the oil is murky green, which is apparently break in oil used by Kohler.

Kohler doesn't supply their engines to the mower manufacturer with oil in them, they are shipped dry and the mower manufacturer puts in the oil, and the use of break in oil is not supplied by Kohler nor do they recommend it.
 

SidecarFlip

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Guess you never owned a Tecumseh HH series engine. Those kept the mosquito's away. Poor oil control rings.
 

Fizzerpilot

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I got a response...

Ok, so I spoke with our Tech Brian. He explained the process to me a little better and says he has definitely seen some brands of break in oil turn this color when it interacts with gas. He wasn’t concerned, but said to keep an eye on it for a little bit after the oil change. It may take a couple of oil changes to get all of the gas out of the oil. You can actually smell it, barely, on the dipstick most likely, even after the first oil change.

The exact process of what causes oil in the gas is as follows:

Gas can bypass the rings more easily on a unit until it is “broken in” and the rings are seated well.
Anytime the unit is ran for less than 10-15 minutes, there will be more unburnt fuel in the cylinder than if the unit was allowed to run longer. The fuel will drain down and bypass the ring via the ring gap even when the unit is fully broken in.
There will always be some fuel that could technically bypass the rings once it is ran past the 10-15 minute barrier, but as the engine heats up the likelihood is less and once the oil heats up it will vaporize the gas and push it out the evap line into the carb to recycle it. In your case I suspect it was simply letting more pass then could be burnt up.

At any rate, we don’t believe you have an issue. I am not an expert on this this, and am trying to relay what the Tech described to me, so if something doesn’t make sense, please don’t hesitate to ask.
 
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