Newbie has rust on Crankshaft. Is complete rebuild required?

stillnotrunning

Recruit
Joined
Jul 12, 2009
Messages
5
Greetings,
I am a newbie. New to forums. New to rebuilding outboard motors.
I have a a 1980 Johnson 35hp J35ELCSM It unfortuantely was swallowed by floodwaters of Ivan in 2004. At the time ASAP I profusely rinsed and then flooded with gas/oil mix while spinning the flywheel. I oiled the open ports to the best of my then limited knowledge, and covered the motor until I could get back to it. That time has finally come to pass 5 years later.
The motor still spins smoothly, and turns the prop when in gear. There is compression although I don't know how much at this point. Feels reasonable.

Removing the intake manifold, and taking a look at the crankshaft shows rust on the crank. I have pictures I will post as soon as I learn how.
So...
Is it reasonable to try to put it back together and see if it runs?
Or, is this rust a definite total strip down and rebuild?

In your opinion, is this motor worth a complete rebuild?

Thanks!
 

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F_R

Supreme Mariner
Joined
Jul 7, 2006
Messages
28,226
Re: Newbie has rust on Crankshaft. Is complete rebuild required?

Greetings,
I am a newbie. New to forums. New to rebuilding outboard motors.
I have a a 1980 Johnson 35hp J35ELCSM It unfortuantely was swallowed by floodwaters of Ivan in 2004. At the time ASAP I profusely rinsed and then flooded with gas/oil mix while spinning the flywheel. I oiled the open ports to the best of my then limited knowledge, and covered the motor until I could get back to it. That time has finally come to pass 5 years later.
The motor still spins smoothly, and turns the prop when in gear. There is compression although I don't know how much at this point. Feels reasonable.

Removing the intake manifold, and taking a look at the crankshaft shows rust on the crank. I have pictures I will post as soon as I learn how.
So...
Is it reasonable to try to put it back together and see if it runs?
Or, is this rust a definite total strip down and rebuild?

In your opinion, is this motor worth a complete rebuild?

Thanks!

You have two choices--to gamble or not to gamble. The safe thing to do is tear it down and examine the bearings for pitting.

The other option is run it and see what happens. If they are pitted they will run awhile but eventually complete failure will occur. A trained ear can hear them if they are pitted real badly. Know anybody qualified?
 

R.Johnson

Rear Admiral
Joined
Sep 24, 2003
Messages
4,446
Re: Newbie has rust on Crankshaft. Is complete rebuild required?

Water, and five year's to sit. You now have a replica of a outboard engine.
 

stillnotrunning

Recruit
Joined
Jul 12, 2009
Messages
5
Re: Newbie has rust on Crankshaft. Is complete rebuild required?

Thanks FR, I have added pictures, don't know if that will help guage the possibilities. There is noise as I turn by hand, but no real grinding scraping above what I would expect with the thin layer of rust. Plugs are out, but I still seem to hear a diaphram or preasure like sound at one point of the rotation. Could be the bearings I guess unless there is something that should be making sound with the plugs out.

I do have a friend who owns a marine store, but this is his really busy season, and I feel bad about asking for free time/advice during this time.

I was hoping I could spend $300-$400 to get this motor running well. If that's not likely then I may have to reconsider. Unfortunately I don't have a clue what rebuilding would cost.

Thanks for the help!
 

tx1961whaler

Vice Admiral
Joined
May 31, 2008
Messages
5,197
Re: Newbie has rust on Crankshaft. Is complete rebuild required?

It's a 29 year old motor. I'm a gambler (and also have a kicker motor :) ), so I'd oil it like you did before, load it up with 24:1 gas and run it, while at the same time looking for a new motor or power head. The fact the it is not totally frozen after being submerged and not being run for 5 years is a good sign that the oiling you gave it may have saved it. I'd never run it at 50:1 again........
 

stillnotrunning

Recruit
Joined
Jul 12, 2009
Messages
5
Re: Newbie has rust on Crankshaft. Is complete rebuild required?

Thanks tx1961... I'm not usually a gambler, which is why it's taken me 5 years, but I'm running out of time and money.
I've got a 15hp that didn't get dunked (which is what I've been using) so maybe I'll use that as my kicker when I get this one going.

Decided to go for it, sprayed WD40 on the crank (parts I could see) and it cleaned up pretty nicely. Tested the main electrical components and have a spark at both plugs. Now I just have to find all the parts I took off 5 years ago, clean the carburetor and put it back together.


Thanks to all for your input so far!
 
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