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Dec 30th, 2023
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 Lower Unit Oil Leaking Out of Top Screw??
#10617954
02/14/15 05:27 AM
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Joined: Apr 2012
Posts: 175
cwoodfishing
OP
Outdoorsman
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OP
Outdoorsman
Joined: Apr 2012
Posts: 175 |
I have a 2001 Mercury 225 and I changed the lower unit oil yesterday. Went to the lake today and after I loaded the boat back on the trailer I noticed the lower unit oil is leaking out of the top screw? I checked the screw and it is tight. Anyone ever heard of or had this issue??
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10617966
02/14/15 05:38 AM
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Joined: Aug 2003
Posts: 362
CADD
Angler
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Angler
Joined: Aug 2003
Posts: 362 |
Did you inspect or put on a new screw gasket? I use new ones each time since I'm afraid of a leak
2001 Pathfinder 2200V 150Vmax HDPI
2015 Diablo Amigo (Sand Fleck)
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10618318
02/14/15 03:13 PM
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Joined: Jun 2006
Posts: 2,497
John Anderson
Extreme Angler
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Extreme Angler
Joined: Jun 2006
Posts: 2,497 |
Sometimes the gasket can stay stuck to the gearcase / or fall off and you not catch it...
Check lower unit for water also and replace gaskets with new ones.
Last edited by John Anderson; 02/14/15 03:14 PM.
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10619343
02/15/15 03:06 AM
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Joined: Aug 2007
Posts: 4,591
stick steering
TFF Team Angler
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TFF Team Angler
Joined: Aug 2007
Posts: 4,591 |
Replace basket and check grease for water comtaminatioN
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10623321
02/16/15 11:11 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 |
Check gasket. But also check with Sevice Manual. I know my '01 250 EFI requires to fill, then allow 2 oz to drain out before putting plug in. This is imperative for pressure build up in gear case.
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10623350
02/16/15 11:20 PM
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Joined: Mar 2010
Posts: 25,839
T Bird
TFF Guru
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TFF Guru
Joined: Mar 2010
Posts: 25,839 |
Gasket/washer missing or needs replaced. Lower unit overfilled. Cracked oil plug housing.
Nothing else I can think of can/should cause it.
Okie by birth, Texan by choice. ![[Linked Image]](https://texasfishingforum.com/forums/pics/userpics/2021/01/full-47849-80883-111.jpg) USAF "Thunderbirds" Alumni 1985-1989
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Re: Lower Unit Oil Leaking Out of Top Screw??
[Re: cwoodfishing]
#10624973
02/17/15 03:18 PM
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Joined: Jul 2012
Posts: 159
K5RCD
Outdoorsman
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Outdoorsman
Joined: Jul 2012
Posts: 159 |
Check to make sure there are not 2 gaskets. Sometimes the old one stays in there and is hard to see. If 2, it will leak for sure. It is a common mistake.
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