Topic: 1947 Evinrude Sportwin – Antique Outboard Motor Club,Inc

This topic has 16 replies, 7 voices, and was last updated 2 years, 5 months ago by lindy46.

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October 31, 2022 at 9:03 am #268472
Tim Murray
Participant
I just purchased a 1947 Sportwin serial number 4421-04424. I’m completely new to restoring antique boat motors. I assume that the important part of the serial number is the first 4 digits…4421. This would indicate that the motor is a 1947 Sportwin 3.3 hp. What does the second set of numbers (04424) represent?

Suggestions on how to start the process and determine what it will take to get the motor running?

Thanks
October 31, 2022 at 10:49 am #268475
Tubs
Participant
The first 1947 Sportwin produced was 4421-00001. The second was 4421-00002 & so on.
For me its cleaning and examining the motors overall condition looking for issues.
Then cleaning the fuel and electrical system, as well as the gear case, evaluating their
overall condition as well as any obvious issues. .
Tubs.

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
October 31, 2022 at 1:16 pm #268490
Tim Murray
Participant
That explains the serial number! Thanks

Anything I should do before turning the motor over like putting oil in the cylinders etc… I want to avoid the wish I wouldn’t have done that before it’s too late

Thanks
October 31, 2022 at 3:51 pm #268504
Steve A W
Participant
Here’s a good article about reviving an old motor.

http://precisionservoutboard.com/about/arts-five-point-plan/

Member of the MOB chapter.
I live in Northwest Indiana
October 31, 2022 at 5:11 pm #268510
crosbyman
Participant
Canada Member
fyi

1947 Evinrude 3.3hp sportwin | Antique Outboard Motor Club,Inc (aomci.org)

Joining AOMCI has priviledges 🙂
October 31, 2022 at 5:30 pm #268511
Tim Murray
Participant
Thanks that’s exactly what I was looking for. I live in the Grand Rapids area of Michigan
October 31, 2022 at 8:06 pm #268527
Steve D
Participant
As far as the Five Point Plan mentioned above, the only thing I’d change is check the compression FIRST. If there is serious lack of sufficient compression you want to find out why first, before putting too much time, energy, money into fixing it. If the poor compression is caused by bad rings, scored cylinders, cylinder head gasket, etc. all that other work isn’t going to make that much difference in how it runs.
November 1, 2022 at 9:09 am #268536
Tim Murray
Participant
Thanks, that’s a good suggestion. Knowing that the motor has been sitting for 40 years, would you squirt some oil in the cylinders before testing the compression? I’m concerned that I’ll damage the cylinder wall if I don’t. If do put lubricant in the cylinder, what would you use?

Thanks
November 1, 2022 at 9:42 am #268538
todd281
Participant
Putting oil in the cylinders might raise the compression readings a bit. The oil helps to seal the rings to the cylinders. Having said that, I always put a bit of wd-40 on a new to me motor. If the readings show up good, then I continue with making it run. Once it is up and running, the compression may increase a bit anyway from the rings seating better. So, my two cents is, a squirt of light oil isn’t a bad idea.
November 1, 2022 at 11:18 am #268543
Tubs
Participant
I have found that compression reading, epically
in motors of this age, aren’t a very good
indicator of a motors condition.
Tubs.

https://youtu.be/87sknMrua2s

A "Boathouse Repair" is one that done without having tools or the skills to do it properly.
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