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Mercury 125 leaking oil from cap
Posted: Sun Jun 09, 2013 5:17 pm
by BiXLL
I have a 2003 Mercury 125 HP. I am docking this year at a boat club and have been storing with the motor tilted all the way to have lower unit out of the water. The other day I was walking down the dock and noticed a oil slick behind my boat. To make a long story short I figured out that the oil is leaking out from the oil tank cap. I checked it out closely and the O ring seems to be fine. The cap is marked to turn to right to close and to left to open. I am not sure why as I can pull the cap off when it is turned all the way to the right. I can see in the throat of the tank what looks to be sort of a thread, but I see nothing on the cap that would go into that thread.
Could I possibly have the wrong cap on this motor? The cap is yellow, with an O ring about half way up on its base and again I see nothing on the cap that would benefit me by locking it in place by turning it.
Re: Mercury 125 leaking oil from cap
Posted: Sun Jun 09, 2013 6:21 pm
by cwag911
Re: Mercury 125 leaking oil from cap
Posted: Sun Jun 09, 2013 6:33 pm
by BiXLL
Wow, it describes my exact problem, but it states for motors under 125 hp, I have a 125. I am going to contact seller and see what he says. Thank you very much for your efforts in finding this.
Re: Mercury 125 leaking oil from cap
Posted: Mon Jun 10, 2013 9:36 am
by STEVEBRENDA
Ours is real loose as well. It was not like that when it was new. We do not tilt our motor up much while it is on the lift.
Re: Mercury 125 leaking oil from cap
Posted: Mon Jun 10, 2013 9:43 am
by BiXLL
I have ordered a new cap and O ring, gonna try that first
Re: Mercury 125 leaking oil from cap
Posted: Wed Jun 12, 2013 5:48 am
by ToonGuy
My buddies 115 did the exact same thing. As long as you didn't fill the tank over 3/4 full it was OK. For me that would drive me crazy...
Re: Mercury 125 leaking oil from cap
Posted: Wed Jun 12, 2013 6:40 am
by STEVEBRENDA
BiXl where did you order your cap from?
Re: Mercury 125 leaking oil from cap
Posted: Wed Jun 12, 2013 6:41 pm
by BiXLL
STEVEBRENDA wrote:BiXl where did you order your cap from?
www.Boats.net
Re: Mercury 125 leaking oil from cap
Posted: Mon Jun 24, 2013 10:48 am
by STEVEBRENDA
Did this fix your problem? I order the easy fill extension and also bougt severa lsize O rings for when we go to the lake next time. Do you know what size O ring it takes?
Re: Mercury 125 leaking oil from cap
Posted: Mon Jun 24, 2013 11:42 am
by BiXLL
Yes it fixed my problem. What I found after the new assembly came is that mine was not squeezing together thus forcing the o ring to expand out and make a seal. The new one works great and I can now tilt all the way up with a full tank of oil with no leaks
Re: Mercury 125 leaking oil from cap
Posted: Thu Jul 11, 2013 7:38 am
by STEVEBRENDA
We ordered and installed the the extension as suggested above. It seems like it will be more conviennt to use.
http://www.ebay.com/itm/MERC-BUDDY-Merc ... 0812681168
For those of you with he leaking cap, I found that if you clean all of the oil build up off of the seal and filler neck, your cap can now seal as if it were new---- no need to buy a new oil cap!
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