1975 Johnson 115HP Lower Unit Question

trimmers

Petty Officer 3rd Class
Joined
Mar 1, 2010
Messages
88
Happy Holidays everyone!

I have a 1975 Johnson 115HP 4cyl Motor. Let me start by saying all cylinders are good with even compression and all that so i know it isn't a motor issue. RPM's rise fine and has lots of power. The problem is, when i put it in the water, it just won't go anywhere. It won't even fight a slow tide. I can put it in gear and spin the prop by hand which in-turn, spins the flywheel. But when I put a load on it, there is no prop spinnage (spinnage a word? lol). I was wondering, is this a product of the hydraulic assist (pump) in the lower unit? There is no clanking, grinding or unusual sounds, just no spinnage. I did notice the lower unit fluid is a bit milky, but not too bad. Any insight on a theory would be greatly appreciated. Thank You, Dan
 

gbb

Petty Officer 2nd Class
Joined
Aug 11, 2008
Messages
159
Re: 1975 Johnson 115HP Lower Unit Question

Spun Hub
 

trimmers

Petty Officer 3rd Class
Joined
Mar 1, 2010
Messages
88
Re: 1975 Johnson 115HP Lower Unit Question

I should of mentioned the symptoms are the same with 2 props, the original and one off another motor that pushes a pontoon boat over 30mph. So the hub can't be it. Sorry for leaving that info out. Spun hub was my first thought too.
 
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