water in the lower unit on 25 hp johnson

[bigbucks198]

I'm a newbie working on a 25 hp johnson outboard. I drained my lower unit and found milky oil. can anyone give an idea what would cause it?thanks

 

[wilde1j]

Re: water in the lower unit on 25 hp johnson

Seal leak(s). There are three locations plus the drain/fill plugs: shift rod, drive shaft and prop shaft. If you want to find which is the leaker, pressure/vac test the LU. Drain oil, the pressurize (10 psig is probably OK, but check the shop manual. Put the LU under water and look for bubbles. Rotate/move all shafts, to verify all are OK. A good LU will hold some pressure/vacuum for 30 to 45 minutes.

On a small motor like yours, another approach would be to just replace all the seals.

 

[kfa4303]

Re: water in the lower unit on 25 hp johnson

Hi bigbucks. you'll probaly need to change the lower unit seals. It's no that hard. You can get a seal kit right here at iboats for about $20. You may need a seal puller, but no other special tools are needed. This link may help.


http://forums.iboats.com/showthread.php?t=277190&highlight=lower+unit+seal+kit+installation

 

[Haffiman]

Re: water in the lower unit on 25 hp johnson

If pulling the prop-shaft bearing housing to change the seals, be very careful NOT to pull the propshaft. That might put you in more trouble than you may appreciate!

 

[bigbucks198]

Re: water in the lower unit on 25 hp johnson

thanks for the help