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Dec 30th, 2023
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 Merc Lower unit
#14346955
04/19/22 12:34 AM
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Joined: Mar 2016
Posts: 1,697
Lazy Ike
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Extreme Angler
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OP
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Posts: 1,697 |
 Thought I would ask for ideas or help from you forum guys who have probably more experience than I. So changed L.U. gear lube recently. I have noticed some of gear lube coming out of the upper vent plug on l. u. When I changed lube, also Installed new gasket on plugs.??????
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Re: Merc Lower unit
[Re: Lazy Ike]
#14347502
04/19/22 05:57 PM
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Joined: Oct 2005
Posts: 20,755
kingdad101
TFF Guru
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TFF Guru
Joined: Oct 2005
Posts: 20,755 |
probably not it , ... BUT did you take the old gasket out of the hole .. sometimes they stay in the hole ..just a thought ..
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Re: Merc Lower unit
[Re: kingdad101]
#14347941
04/20/22 04:42 AM
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Joined: Mar 2016
Posts: 1,697
Lazy Ike
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Extreme Angler
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OP
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 thanks for info will double check that!!
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Re: Merc Lower unit
[Re: Lazy Ike]
#14347951
04/20/22 07:01 AM
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Joined: Dec 2010
Posts: 5,585
Mckinneycrappiecatcher
TFF Celebrity
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TFF Celebrity
Joined: Dec 2010
Posts: 5,585 |
Yep, clean the gasket holes up really well and make sure the old gasket came out well. If it’s those paper gaskets then they’ll stick on there really well, you could even try putting a bit of brake cleaner on a paper towel to get any residue off like when you clean a gasket off on a differential on a car. Always replace the gaskets if they’re those little paper ones. There are only two screws right? One on the bottom of the unit and one on the top?
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Re: Merc Lower unit
[Re: Mckinneycrappiecatcher]
#14348758
04/21/22 02:40 AM
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Joined: Mar 2016
Posts: 1,697
Lazy Ike
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thanks for info ya'll , pretty sure i got old gasket off. when i noticed fluid leaking it was from top plug on l.u. and with engine tilted up, for trailing.. nver seen before ??
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Re: Merc Lower unit
[Re: Lazy Ike]
#14348798
04/21/22 04:59 AM
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Joined: Dec 2010
Posts: 5,585
Mckinneycrappiecatcher
TFF Celebrity
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TFF Celebrity
Joined: Dec 2010
Posts: 5,585 |
This may seem like a dumb question, but, did you use a standard 90w conventional marine gear oil? Quicksilver, west marine, type stuff? If you used a synthetic or syn blend substitute theres always a slight chance the synthetic is thinner than what was originally used and could cause some leaks around seals.
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Re: Merc Lower unit
[Re: Lazy Ike]
#14349032
04/21/22 02:50 PM
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Joined: Dec 2003
Posts: 36,177
Allison1
TFF Guru
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TFF Guru
Joined: Dec 2003
Posts: 36,177 |
When you change gear lube you take out both the upper and lower screws out.
When you fill it up with lube, keep the lower unit level and fill till fluid comes out the top hole.
Once you do that there should not be any fluid coming out either of the holes. If there is you need a new gasket and while you're at it check the fluid again because you may have gotten water in the lower unit.
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Re: Merc Lower unit
[Re: Allison1]
#14349501
04/22/22 01:32 AM
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Joined: Mar 2016
Posts: 1,697
Lazy Ike
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thanksguys for your input. I been using 90wt quicksilver. I have changed it myself for at least 4yrs. I got old gaskets off plugs. Gonna look at it fri or sat. Probably go ahead & change gaskets again, and see how much 90 wt it takes to start comin out top hole. Outta tell me how much is gone. It has only been 3 weeks most
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