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Dec 30th, 2023
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 Changer Lower Unit Oil - Oil seeping from vents
#11883240
10/16/16 07:41 PM
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Joined: Oct 2015
Posts: 112
Basser1OH
OP
Outdoorsman
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OP
Outdoorsman
Joined: Oct 2015
Posts: 112 |
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?
2006 Ranger Z20 - 225 ProXS
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Basser1OH]
#11883882
10/16/16 11:26 PM
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Joined: Mar 2010
Posts: 2,884
DKennimer
Extreme Angler
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Extreme Angler
Joined: Mar 2010
Posts: 2,884 |
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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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: DKennimer]
#11883965
10/17/16 12:06 AM
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Joined: Oct 2015
Posts: 112
Basser1OH
OP
Outdoorsman
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OP
Outdoorsman
Joined: Oct 2015
Posts: 112 |
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.
2006 Ranger Z20 - 225 ProXS
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Basser1OH]
#11888938
10/19/16 04:20 PM
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Joined: Apr 2010
Posts: 119
CVANN7119
Outdoorsman
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Outdoorsman
Joined: Apr 2010
Posts: 119 |
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!!
CHANCE VANN
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: CVANN7119]
#11915237
11/03/16 06:24 PM
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Joined: Oct 2016
Posts: 536
Bulletman99
Pro Angler
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Pro Angler
Joined: Oct 2016
Posts: 536 |
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
Bullet 20XD
Merc 250 ProXS
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Basser1OH]
#11917895
11/05/16 09:08 AM
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Joined: Nov 2002
Posts: 4,439
Gamblinman
TFF Team Angler
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TFF Team Angler
Joined: Nov 2002
Posts: 4,439 |
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.
Last edited by Gamblinman; 11/05/16 09:11 AM.
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Gamblinman]
#11920812
11/07/16 01:33 PM
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Joined: Oct 2016
Posts: 536
Bulletman99
Pro Angler
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Pro Angler
Joined: Oct 2016
Posts: 536 |
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.
Bullet 20XD
Merc 250 ProXS
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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Basser1OH]
#11920936
11/07/16 02:35 PM
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Joined: Dec 2002
Posts: 3,826
Tommy Yetts
TFF Team Angler
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TFF Team Angler
Joined: Dec 2002
Posts: 3,826 |
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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Re: Changer Lower Unit Oil - Oil seeping from vents
[Re: Basser1OH]
#11923403
11/08/16 07:13 PM
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Joined: Jul 2010
Posts: 1,348
boatman025
Extreme Angler
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Extreme Angler
Joined: Jul 2010
Posts: 1,348 |
Bet its the seal under water pump only place you see oil in water pick ups
Hughes Marine
3855 Osage Lane
Wylie ,Texas
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