#433260 - 05/07/08 07:05 PM
Lower Unit Question
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River Nutrients
Registered: 01/13/03
Posts: 2665
Loc: Edmonds
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Ok, so I might be an idiot. I was changing the lower unit (gearcase) oil on my 200 Yamaha hpdi. It takes a bit more than a quart. I drained the oil. When refilling I pumped the first quart in and then replace the top screw (oil level) so that I could pull the pump out of the bottom, change quarts without a whole bunch of fluid draining from the fill hole, and then pump a bit more to fill the gearcase.
Well, I left the top screw in just a little bit and began pumping more fluid in thinking a bit would ooze out telling me it was full. After a few pumps from the second quart fluid starting come out of the little hole (not a screw hole, I think it's the hole that tells you your mph) and a bit of oil also came out of the propeller where it would exit the exhaust. I removed the top screw and maybe a couple ounces drained before getting to the right level. I hope that made sense.
So, the question. Do you think by adding a couple extra ounces to the lower unit I could have blown any seals or would the bit of overflow out of the two places I described be a non issue?
I've done this service to all my motors and never forgot to pull the top screw back out when starting to pump from the second quart.
Edited by wntrrn (05/07/08 07:06 PM)
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#433268 - 05/07/08 07:29 PM
Re: Lower Unit Question
[Re: AP a.k.a. Kaiser D]
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River Nutrients
Registered: 01/13/03
Posts: 2665
Loc: Edmonds
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At most I pumped 1-2 ounces too much fluid in there. I thought with the top screw almost completely loose some fluid would ooze out letting me know it was full. I usually have the top screw completely removed but just thought.... well, I hope I didn't F-up.
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#433313 - 05/07/08 10:58 PM
Re: Lower Unit Question
[Re: wntrrn]
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Repeat Spawner
Registered: 02/09/07
Posts: 1422
Loc: Your monitor
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Make sure you close the top screw all the way when changing quarts. Leave the top screw all the way open when filling. When oil comes out the top its full. I would drain it again and start over. If you see the same thing happen then something is wrong. Also make sure that oil is coming out of the places you mentiond and it just not spillage that looks like a leak.
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#433327 - 05/07/08 11:51 PM
Re: Lower Unit Question
[Re: j 7]
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River Nutrients
Registered: 01/13/03
Posts: 2665
Loc: Edmonds
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First, I know I screwed up. Second, I can't believe a seal would blow by the pressure from a couple (at most) extra ounces of fluid.
I'm going to talk to one of the techs tomorrow but would still like to know if anyone has experience with this. Any chance there is an overflow valve inside the lower unit causing fluid to leak into other areas or did I more than likely blow a seal? That doesn't sound too likely to me because if oil can get out water can get in? Sorry to beat this to death but it's on the brain right now.
Edited by wntrrn (05/07/08 11:53 PM)
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