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 Post subject: Water in lower unit oil
PostPosted: 29 Sep 2016, 16:42 

Joined: 05 Sep 2016, 05:50
Posts: 41
Recently purchased a 1985 15hp Johnson. I checked the gear lube when I bought the motor. I have ran the motor a few times now, pulled the lower unit plug and oil is milky. I replaced with fresh lube. What should be my next step? The screws were tight and the little gaskets were on them when I drained the oil.


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PostPosted: 29 Sep 2016, 16:42 

Joined: 05 Sep 2016, 05:50
Posts: 41
Oh, the oil looked new when I bought it.


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 Post subject: Water in lower unit oil
PostPosted: 29 Sep 2016, 17:51 
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Joined: 15 May 2010, 00:38
Posts: 2621
Location: Central Florida
Your next step is to find where the water is entering the gearcase. If you are lucky it will be a driveshaft seal.


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 Post subject: Water in lower unit oil
PostPosted: 30 Sep 2016, 16:33 
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Joined: 02 Mar 2014, 19:52
Posts: 3193
Location: Central FLORIDA - The Sunshine State -
The reason the oil looked new when you bought it is the previous owner
"probably" changed the oil and never ran it in water after that.
= hence no water in the oil when you bought it.

with many thanks to Pappy, I was able to overcome
my intimidations of breaking open the gear case . . .
To replace the prop shaft seal is pretty straight forward.
To dig down and replace the shift linkage seal is a bit more complicated.

Order the complete Gear Case Seal kit from e-bay or Marine Engine
http://www.marineengine.com/parts/johns ... n=Gearcase
and using your parts book, take it all apart, taking photos as you go.
clean as you go - take notes as you go.
don't muck up the head on the pivot pin or loose the detent spring or the two little balls.
work on a clean table (the kitchen table is perfect for this).
the good old YouTube has several good videos on how to pressure test to check for leaks
and to replace the seals with a seal kit.

oh, it is also highly recommended to replace the impeller while you have it open.





.



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 Post subject: Water in lower unit oil
PostPosted: 30 Sep 2016, 21:53 

Joined: 13 Jan 2014, 01:04
Posts: 123
On the mercury's the water pump kits have seals coming from shaft side that are easily replaceable. Another cheap insurance is to replace the o-rings on the fill screws. Hopefully it is not coming from the prop side. There are some Youtube videos on how to replace those seals but they seem complicated. The other option is to change it more often till it dies. I recently purchased a 50hp mercury classic on a bass tracker and took it out the first time and the lower unit grinded to death due to only water in the lower unit. It cost me 350 to buy a used one on ebay that was pressure tested.


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PostPosted: 30 Sep 2016, 23:45 

Joined: 05 Sep 2016, 05:50
Posts: 41
Thanks Johnny, Pappy, I'll give it a go.


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