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620 I Gator - getting fuel in crankcase oil
First, there is a bulletin for the older 620 motor regarding fluid in the oil. It states that the drain holes in the heads are very small and it takes a long time for all the oil to get into the lower crankcase. It says to fill the crankcase to half way up the stick when you change the oil and wait until the next day to check the level on the stick. Half inch rise is not uncommon. I've had many people say they were getting gas in their oil and it was just slow draining oil. Crankcase oil will smell like gas also. But if you are continually raising the level in the crankcase you have a problem. If there is a malfunction in the ECU it should set a code that flashes on the dash when you turn the key on. Codes are a series of long ( 1.2 sec.)and short ( .2 sec. )flashes with a 4.8 second pause. If more than one code is set, it will follow the first and then the cycle will repeat. Also certain codes will shut one cylinder down so you can't run it very far. You say yours is running OK, so I guess it isn't one of those codes. I don't know which codes shut it down and which don't. I would try this. If you don't have any flashing codes, I would monitor the oil level and see if it continues to rise, best to check after it has sat overnight. If it continues to rise it sounds like a good question for a high echelon John Deere Tech Guru. Good luck.
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620 I Gator - getting fuel in crankcase oil
I talked to the service manager in the midwest that I talk to when I get stumped on something and he said they had the same exact problem on an EFI Z-turn mower. They checked everything, sensors, leak down, injectors, all of it. What they finally did was pull the pistons out, hone the cylinders, and put new rings in it and that fixed it. I don't know if D tech even knows about it. The machine was out of warranty. He said it looked like it may have been blowing by at the top of the compression stroke, kinda like what Allisman just said. I don't know how old yours is but I would think you have a case for a repair or at least some help.
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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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