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#11883240 - 10/16/16 02:41 PM Changer Lower Unit Oil - Oil seeping from vents
Basser1OH Offline
Outdoorsman

Registered: 10/29/15
Posts: 111
Loc: Aubrey, TX
I changed my lower unit oil today and later saw a few drips of oil coming out of the vents on the lower unit a little later after trailering.

Anything to be concerned about?
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2006 Ranger Z20 - 225 ProXS


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#11883882 - 10/16/16 06:26 PM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Basser1OH]
DKennimer Offline
Extreme Angler

Registered: 03/01/10
Posts: 2869
Loc: Plano/Fork
Did you replace the gaskets? Also, depending on lower unit, some (I know my TM) need to drain about 1.5 oz out after filling to allow for expansion. You can blow a seal if not.

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#11883965 - 10/16/16 07:06 PM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: DKennimer]
Basser1OH Offline
Outdoorsman

Registered: 10/29/15
Posts: 111
Loc: Aubrey, TX
Didn't have replacement washers but the old ones looked good. No oil leaking from the plugs, just the water intake holes, but just a few drops.

I was not aware of letting some oil out for expansion but will check with Mercury for the specs.
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2006 Ranger Z20 - 225 ProXS


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#11888938 - 10/19/16 11:20 AM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Basser1OH]
CHANCE-FNS BOATS Offline
Outdoorsman

Registered: 04/10/10
Posts: 119
Loc: Tx
The only way oil can come out of the water pick screens is if you shift shaft seal or drive shaft seal is leaking. I wouldn't keep running it!! You need to get someone to pressure it up and see where the leak is. A seal cost a whole lot less than a lower unit!!
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CHANCE @ FUN N SUN BOAT SALES

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#11915237 - 11/03/16 01:24 PM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: CHANCE-FNS BOATS]
Bulletman99 Offline
Angler

Registered: 10/26/16
Posts: 492
Loc: South Texas
Originally Posted By: CHANCE-FNS BOATS
The only way oil can come out of the water pick screens is if you shift shaft seal or drive shaft seal is leaking. I wouldn't keep running it!! You need to get someone to pressure it up and see where the leak is. A seal cost a whole lot less than a lower unit!!


X2
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Bullet 20XD
JSRE Modified Merc Promax

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#11917895 - 11/05/16 04:08 AM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Basser1OH]
Gamblinman Offline
Extreme Angler

Registered: 11/26/02
Posts: 2857
Loc: Yantis, TX
It may be a few drops setting on the trailer at the ramp, but once you run it a lot more comes out. Sounds like you may have overfilled it and caused a seal to fail.

After changing lower unit oil, I always bleed any pressure or overfill off by running it and getting the oil warm, put it back on the trailer and then crack the bleed screw. This is especially important on Mercury torquemaster and sportmaster lower units.


Edited by Gamblinman (11/05/16 04:11 AM)
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#11920812 - 11/07/16 07:33 AM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Gamblinman]
Bulletman99 Offline
Angler

Registered: 10/26/16
Posts: 492
Loc: South Texas
Originally Posted By: Gamblinman
It may be a few drops setting on the trailer at the ramp, but once you run it a lot more comes out. Sounds like you may have overfilled it and caused a seal to fail.

After changing lower unit oil, I always bleed any pressure or overfill off by running it and getting the oil warm, put it back on the trailer and then crack the bleed screw. This is especially important on Mercury torquemaster and sportmaster lower units.



This is very true---When the oil heats up, pressure builds and expands causing seals to fail.
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Bullet 20XD
JSRE Modified Merc Promax

Finch Nasty Bait Co Pro Staff www.finchnastybaitco.com
Army Bass Anglers Coalition Pro Staff www.armybassanglers.com

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#11920936 - 11/07/16 08:35 AM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Basser1OH]
Tommy Yetts Offline
TFF Team Angler

Registered: 12/14/02
Posts: 3479
Loc: Rockwall, TX USA
If you follow the procedures for filling the gearcase you cannot overfill it! Pressure check the l/u and see where the leak is.
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Tommy Yetts

www.rockwallmarine.com

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#11923403 - 11/08/16 01:13 PM Re: Changer Lower Unit Oil - Oil seeping from vents [Re: Basser1OH]
boatman025 Offline
Angler

Registered: 07/16/10
Posts: 486
Loc: McKinney
Bet its the seal under water pump only place you see oil in water pick ups
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McKinney ,Texas

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