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Go Back   SailNet Community > General Interest Forums > Gear & Maintenance > Engines > Diesel
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Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


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Old 06-28-2010
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Yanmar YSE8 oil change/fill question?

I have an oil fill at the front for the crankcase, and one at the back for the clutch housing. I was told when changing the oil, I ONLY had to empty from the front and that both would drain as they were one and the same. I then filled both with fresh oil, but seemed to have to add more directly to the clutch housing. But now the crankcase seemed to overfill, and I'm leaking oil from underneath somewhere...I imagine I've weakened a seal somewhere The other odd thing is that the clutch oil is CLEAN and clear, but he crankcase oil is it's usual BLACK....if they're one and the same for filling, and draining, how can this be? Can someone please clear this up for me once and for all? THANKS!!!!!
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Old 06-28-2010
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Is it the transmission rather than the clutch?

Don't know your particular engine setup but the unit at the back of the engine is likely the transmission which is totally separate from the engine and often uses a different kind of oil (transmission fluid in my boat). The transmission oil is not exposed to combustion products and stays pretty clean and does not need to be changed nearly as often as the engine oil.

Check to see if the shift cable goes to this unit.
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Old 06-28-2010
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thanks KS, but I do know it's the transmission in the back , and mine does use the SAME oil for both, I'm just trying to be 100% sure about them being completely separate for filling and draining, as "my" marina said they were connected for draining...

Last edited by Windemere; 06-28-2010 at 07:25 PM.
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Old 06-28-2010
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The Yanmar YSE8 crankcase lube oil is shared with the reduction gear. The clutch is separate. Here's the lube oil circulation chart.
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Old 07-07-2010
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doesn't quite show it this way in the diagram, but I believe I've figured it out When I drain the oil, I've always managed to get my drain tube to go thru this tight fitting hole for about another 12" or so beyond the first entry level (it's not always easy to find or do, but it's there), and when I did it this week, it appears that I'm pushing a "trap" door or something to get there, and it feels just like it when pushing it thru, or pulling it out....so it appears this trap door keeps the Oil pans separate for each other, but allows the draining of BOTH from one entry point.
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