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Old 12-08-2020, 07:35 PM   #1
SaltwaterTom
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Lower unit oil question

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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Old 12-09-2020, 10:51 AM   #2
Tejas Trucha
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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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Old 12-09-2020, 12:02 PM   #3
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Quote:
Originally Posted by Tejas Trucha View Post
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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Old 12-09-2020, 12:32 PM   #4
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Really odd. I always get close to = amounts in and out.
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Old 12-09-2020, 07:17 PM   #5
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The lower unit only holds 31 ounces so you should be good.
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Old 01-06-2021, 01:32 AM   #6
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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 .
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