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Discussion Boards > Active Subjects > Messages as Posted > John Deere Gator Forum

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 08-16-2010, 16:41 Post: 173179
hardwood

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  fd620d blowby

Does the engine start normally without a lot of cranking?
A diesel that is in good shape usually will start on about the second time over especially in the summer. I don't know what the compression specs are for your engine but I guessing you are in decent shape there if it starts normally.
You mention that you flushed the crankcase with diesel fuel to clean out the antifreeze. If the engine oil is not milky from water/antifreexe and everything else seems normal then I'm guessing you didn't get all the diesel fuel out of the crankcase making the puffing you see is evaporating diesel fuel. All engines will have some blowby even when new.
Frank.






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 08-16-2010, 17:13 Post: 173182
hardwood

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  fd620d blowby

Sorry I took it to be a diesel engine form the title of your post "620d".
Ok, again you must have enough compression, but perhaps that is low for your gasoline engine. They will start with a ompression being a bit less close to spec than a diesel.
With the engine history of antifreeze in the crancase you may have scored cylinder walls letting the blowby be above nornal.
Does the Gator at full throttle actually go 40 or does it just seem like fourty?
I'm not up on modifying Gators to bring the top speed up. I think there are some things that can be done with different pulleys, etc., but if all that top speed was acomplished with engine RPM's you're probably lucky it runs at all.
Frank.






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