Reply With QuoteSounds like it froze and something cracked. If that water stays in there it expands greatly when it freezes. Can easily crack aluminumOriginally Posted by wish4fish
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25 Mercury 2 stroke Help please
Was outside messing with fishing stuff and walked to the back of my boat and I hadn't took off my transom saver and lowered my motor before this bad weather. So I dropped the motor and oil started leaking out at the back of my prop. I pulled the prop and can see a slushy oil mix in the bottom of the motor. I can't tell if it has water in it or if it is just the oil freezing. Did something freeze and bust or can I pull the two or three bolts that I see and have a gasket or something out? Is this lower unit oil? I assume it is. Any help is greatly appreciated.
nothing beats time on the water
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Sounds like it froze and something cracked. If that water stays in there it expands greatly when it freezes. Can easily crack aluminum
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If it was just a little bit you might luck out and it is just unburnt fuel. Loosen the the drain plug a little and check the oil. If it is milky looking then you have a problem. If not run it a few times and then check it again.
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Bill H. PTC USN Ret
Chesapeake, Va
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Come to think of it it did smell more like gas that oil but how in the world does fuel get down there? I am fixing to replace the impeller, change lower unit oil and spark plugs. Its that time of year again. Is there a gasket behind my prop that I need to change or should I not break into that? Thanks I may be able to sleep tonight now! lol
nothing beats time on the water
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Barnacle Bill could be right. Sometimes the unused oil and gas mixture will run out of the exhaust at the prop. Hope that's what it is!Thumbs UpI noticed my Dads' 40 hp evinrude doing the same thing and it was the gas/oil misture running out the exhaust port in the prop.Hands Clapping
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There is a pressed in seal behind the prop, do not mess with this. Always change the lower unit oil in the fall, after your last outing.
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If that 25 merc is about a 87-88 model it's a mercury/mariner motor. We had the same problem and thought that we had lost a seal. But my engine guy said that those models would do that and it was just left over exhaust fuel/oil. He ran a pressure test on the lower unit and it was fine. Check the oil in the lower unit and if it's not milky, I'd forget about it.
Gerald K4NHN
Cayce, SC
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Good advice, I totally agree. All carbed 2-strokes have a lot of unburnt fuel coming down the midsection.
IF it's milky, or water comes out when you crack the drain plug, you could have water inside that shoved the bearing carrier out the back end by pushing the lock nut for the bearing carrier over it's threads. I believe some years even have a plastic lock nut for the bearing carrier, so you can see how that might be easily possible. USUALLY, if ice busted the lower unit, you will see oil dripping out the crack.
Good luck,
JBJ
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