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09' DF250 leaking oil issue

Old 06-03-2020, 09:23 AM
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Default 09' DF250 leaking oil issue

Little background, I had to pull the block on this engine and tear it down as it was making a very loud knocking noise one day on start up. Turns it out it was the infamous butterly valve screw coming loose and had been sucked into the cylinder. Luckily after inspection cylinder walls, pistons, rings, all looked good with no scoring at all. I put it back together and it ran great until I saw the oil leaking from the mainshaft seal directly under the flywheel. After re-reading the Suzuki repair manual, I realized that I made the very stupid mistake of putting the seal in backwards. (Spring towards outside of engine.) Pulled block again, disassembled, reassembled correctly and started it up. Still runs great, but now I still see some oil leaking. The new mainshaft seal is dry so not from there. After pulling off the air intake, injector assembly, etc. I see a bunch of oil in the valley right in front of the 2 water hoses. Looks like it was being forced out of the vent hole that sits in that valley. I am not sure how pressure is building up enough to force oil out of there. Is there a way to check the pressure building up in the block. Compression check was good with 160-170 across the board.

I am not sure where to look next on this and looking for some feedback from the many people smarter than me!
Old 06-08-2020, 06:42 AM
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Anyone?
Old 06-18-2020, 08:22 PM
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I dont think that's a vent hole. It's a drain, that empties out through through the lower engine holder cover. Head gasket perhaps?

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