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620 I Gator - getting fuel in crankcase oil
Thanks to all for the replies. To answer a few questions - the oil did smell of gas and unfortunatly I did not save it. It went into the used oil barrel. I checked the coolant and it was ok. The oil on the dipstick initially was so clean and thin it was hard to see. It must have cleaned out the crankcase well because the new oil since is still extremely clean. To Gatoraide - Thanks for doing some research. The injectors are being tested today. I hope I don't have to hone the cylinders every 18 months. That sounds like it might get pricey. Is the theory that the cylinders are glazed due to shorts trips/ putting around. Would a leak test indicate this or is it just at top of compression stroke as you said. Maybe I should trade it for a new diesel model.
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620 I Gator - getting fuel in crankcase oil
I have talked to my friend again and he has shed more light on the subject. He said when he took the motor apart there was an unusual amount of carbon on top of the piston and around the combustion chamber. He also said he took a compression test before he took it apart and it was unusually high. He couldn't remember what it was but that it was high. He called Deere and asked if there was a high limit on compression and they said no. They only give the low limits. He also said the tops of the pistons were shiney charcoal black with alot of build up. My thinking is that all that build up would decrease the area in the combustion chamber and therefore increase the compression, possibly to the point of squeezing past the rings and into the crankcase. He also said that before he tore it down the guy would drain the bad oil out of it and replace it because he had to use the machine. When he ran it he said it was the fastest mower on the block. More compression, more power. Now, the fact that changing rings fixed the problem could have been a byproduct of cleaning all the carbon out of the cylinder, maybe getting the carbon out would have fixed it too. There are people at Deere that know about the problem but all they say is run it hard and get it hot. Keep the buildup to a minimum. He also said that he knew of one case where changing injectors helped, but the problem came back. I'm thinking that using the best gas available would be a good idea. It will be interesting to hear what your dealer comes up with.
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620 I Gator - getting fuel in crankcase oil
They are scratching their heads too. I have gotten more information from you (Gatoraider) than them so far. I am still waiting for the verdict on the injectors. I will keep you posted.
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620 I Gator - getting fuel in crankcase oil
Hey guys...new member here
Was searching the web for this exact same problem when i came across this thread.
My 620i has 89 hr. After you got it warmed up good it would all of a sudden blow out a huge cloud of blue smoke then quit smoking a short while then do it again.
I checked the oil and it was about 1 1/2 inch high on the stick.I also use mine for short trips.
Did you find out the cause of this? Thanks for any help
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620 I Gator - getting fuel in crankcase oil
Yes I think we figured it out. JD ran several tests on it searching for the problem. They replaced the entire throttle body on it. I have not put that many hours on it since but it seems to have fixed the problem. They said it was possibly an electrical issue with the unit causing the problem.
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620 I Gator - getting fuel in crankcase oil
I had a chance to visit mwith a
I had a chance to visit with a Deere mower tech about this. He made no mention of changing the throttle body but did say they had a Gator and a couple Mowers with the gas/oil dillution problem. In all three cases two common things enmerged, non recommended crankcase oil and short run operation.
Our Gator use is sporatic, sometimes a couple hour run, then several five minute runs, but always have used the recommended Deere 10/30 Gasoline grade oil, and so far so good. Frank.
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620 I Gator - getting fuel in crankcase oil
I forgot to mention, the Deere oil for the Gator is Turf-Gard.
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620 I Gator - getting fuel in crankcase oil
Thanks for the help
Mine is in the shop now and they don't really know what to think about it either.
My warranty is out but in the back of the owners manual it states that 2008 and newer gators have an emmision warranty for 30 mo. This does cover the fuel system.
I'll let you know what they find
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Gas Generator Weather Protecti
09-14-2009, 13:12 
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