Warning

 

Close

Confirm Action

Are you sure you wish to do this?

Confirm Cancel
BCM
Durkin Tactical Franklin Armory
User Panel

Site Notices
Posted: 5/19/2002 8:54:09 AM EDT
I have a 25 hp Johnson on my boat, and after pulling it out of storage this year I noticed something liquid leaking out of the bottom of the motor.  It looks like a mixture of oil and something else (gas?).  It is coming out where the prop hooks onto the motor itself.  I was told that it sounds like I have a bad lower gearcase seal.  

Does this sound right?  The motor itself was made in 1997, but I bought it new last year at a big discount.  What could have caused the seal to go bad?  The motor is still fairly new so I doubt it would just wear out on its own this quickly.  Thanks for the help.
Link Posted: 5/19/2002 9:18:38 AM EDT
[#1]
Been a while, but I seem to remember that the bottom end is supposed to be cleaned and re-lubed every season.  Best at the END of the season instead of the beginning.  If this wasn't done there could have been some water in there to mess things up.

It you can strip your HK, you can fix this.

Probably a seal and maybe a bearing screwed up.

Way older models had a screw in the lower unit for the purpose of draining / lubing.  If nothing else, the lower unit used to be removable.  Look for any bad gaskets, etc.  Good luck.  
Link Posted: 5/19/2002 9:20:05 AM EDT
[#2]
Probably a lower seal. If you have low hours on it, try making sure you have the lower filled, then run it (in gear) for an hour or so in a 55 gal. drum. This may help seal the seal. If not, replace the seal. Get a service manual, do it your self, no big deal....
Link Posted: 5/19/2002 1:02:34 PM EDT
[#3]
Link Posted: 5/19/2002 1:36:28 PM EDT
[#4]
Ok, 1 st off drain the gear oil, then pressure/ vacuum test the lower unit. Then refill, if the lower unit passed the pressure/ vacuum tests. These tests will tell you if you have a bad seal.

Did you winterize the engine, if so my bet is that the problem is just that left over winterizing oil is draining out the exhaust.

By the way, I used to work on OMC outboards before starting my current job!

edited to say that the exhaust usually goes out the 2 little ports on the back of the engine...........but also goes out the center of the propeller hub.

Hope this helps,

Jamie

Link Posted: 5/19/2002 1:48:14 PM EDT
[#5]
Quoted:
Ok, 1 st off drain the gear oil, then pressure/ vacuum test the lower unit. Then refill, if the lower unit passed the pressure/ vacuum tests. These tests will tell you if you have a bad seal.

Did you winterize the engine, if so my bet is that the problem is just that left over winterizing oil is draining out the exhaust.

By the way, I used to work on OMC outboards before starting my current job!

edited to say that the exhaust usually goes out the 2 little ports on the back of the engine...........but also goes out the center of the propeller hub.

Hope this helps,

Jamie

View Quote
If it is thru hub exhaust there will be a plastic ring on the outside of the prop on the aft end if not it is not a thru hub exhaust. Hence: Propguy!! [;)]
Link Posted: 5/19/2002 2:03:10 PM EDT
[#6]
Quoted:
Ok, 1 st off drain the gear oil, then pressure/ vacuum test the lower unit.
View Quote


If the gear oil comes out milky white when you drain it you do indeed have a leak. Milky oil means that water has gotten into the gear oil (probably from a bad seal)..Good Luck
Close Join Our Mail List to Stay Up To Date! Win a FREE Membership!

Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!

You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.


By signing up you agree to our User Agreement. *Must have a registered ARFCOM account to win.
Top Top