Topic: Secret to unstick a motor. – Antique Outboard Motor Club,Inc

This topic has 22 replies, 17 voices, and was last updated 5 years, 7 months ago by destroyer85golf.

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September 30, 2018 at 12:10 am #11387
destroyer85golf
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So, today I went out and picked up this Johnson. Only paid 35 bucks for it. But she’s locked up tight. Pulled the plugs, they look fine. Cylinders just look dry, not to rusty. So I guess what’s the magic sauce to get the pistons moving again? Thinking of making up some half ATF and half acetone. Hear that works wonders.

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September 30, 2018 at 12:59 am #83715
bobw
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US Member
The 50/50 acetone/atf mix is good. Some use 50/50 acetone and brake fluid. Some use Marvel Mystery Oil. I like PB Blaster.

Bob

1937 Champion D2C Deluxe Lite Twin
1954 Johnson CD-11
1957 Evinrude Fastwin 18
1958 Johnson QD-19
1958 Johnson FD-12
1959 Johnson QD-20

“Every 20 minute job is only a broken bolt away from a 3-day project.”
"Every time you remove a broken or seized bolt an angel gets his wings."
September 30, 2018 at 1:06 am #83717
Steve A W
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US Member - 2 Years
My go to is Kroil by Kano labs.

Member of the MOB chapter.
I live in Northwest Indiana
September 30, 2018 at 1:20 am #83718
jw-in-dixie
Participant
Is that an LT-10? Good luck.
September 30, 2018 at 1:35 am #83719
david-bartlett
Participant
Patience is the secret!
September 30, 2018 at 4:11 am #83724
mr-asa
Participant
quote david bartlett:

Patience is the secret!

More than anything, this is the secret.

I used Marvel Mystery Oil, a week’s worth of time, and a big dadgum breaker bar on my last one.
September 30, 2018 at 5:32 am #83726
jcrigan
Participant
If you can find a way to get lubricant into the crankcase that will help. I have found rust on the crankshaft that made it not turn over. Rust in there will also damage bushing surfaces when you do turn it over. I usually use Marvel mystery oil, but have tried the others.
September 30, 2018 at 10:40 am #83729
billw
Participant
US Member - 2 Years
I like PB Blaster, too. Be sure to strap-wrench the flywheel. Don’t just try to turn the flywheel nut. It will just over tighten and possibly break the flywheel. However, be advised that, in my experience, about 99 times out of 100, if you are able to break it free and it starts turning over, the piston rings will still be stuck in their grooves.

Long live American manufacturing!
September 30, 2018 at 1:02 pm #83733
fifty20ne
Participant
US Member
Some club members use GIBBS.

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September 30, 2018 at 2:36 pm #83738
destroyer85golf
Participant
BillW that is a good point, I was thinking of this motor as a winter project. Wanted to try my hand at straightening the tank on it too. Maybe I’ll take the motor completely apart and see what I can do with it. Not sure yet what I want to do. I got the speeditwin running, so now I’m out of a project. I’d also like to let my kids cruise around our pond in a 14’ boat with this motor .
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