Lower unit oil question

[SaltwaterTom]

I did my annual maintenance today on my 2010 Yamaha F250 and when I drained the gear oil from my lower unit, I didn’t get very much out and it was really dark. I pumped in about a half a quart, and drained it again. When I filled the lower unit, it took less than a quart. Any ideas? I had about 120 hours since my last maintenance., a fair amount of that idling in the Gulf.


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[Tejas Trucha]

Did you take off the fill screw at the top when you drained? Needs to get air in top so fluid can drain out bottom


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[SaltwaterTom]

Originally Posted by Tejas Trucha

Did you take off the fill screw at the top when you drained? Needs to get air in top so fluid can drain out bottom


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Yes, I did. I was rather surprised when I removed the upper screw and I didn’t get the steady flow of oil out of the bottom, it was more like a dribble


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[Lav20]

Really odd. I always get close to = amounts in and out.

[rglide09]

The lower unit only holds 31 ounces so you should be good.

[HoustonTexas]

120 hrs at 4000 rpm ve 120hrs at 5000 rpm is big difference. one quart is plenty . pump from lower opening till you see fluid on top hole . my engine is df suzuki so for me is 100hrs .