Johnson TD-20 primer pump seals

[Fastwin18]

I’ve just completed the restoration of a 1947 TD20. Over here in Europe it’s impossible to get the leather seals for the primer pump, and without these, surprise, I couldn’t get it to start. As stated by Lloyd, the o-ring solution does not work. Lloyd’s seems to be the only person selling these, but getting a self addressed EU envelope to Lloyd is not only tricky but also very pricy.

My wife was kind enough to donate an old leather belt. Using a simple 14 mm and 7 mm punch I was able to create  a pair of seals in just a few minutes. This solved the problem and now she finally starts! Just needs a bit of final tuning.  There’s a small amount of water spraying out of along the exhaust cover, so I suspect the gasket is leaking.

If anyone’s interested, the seals need to be 2 mm thick each. The actual fabrication was so simple that I made myself plenty of spares for the future 🙂

[seakaye12]

That’s great!  How about a couple of pictures of your process and final product?  Thanks!

[crosbyman]

Necessity is the mother of inventions …..

I think Einstein…. said     “Creativity is more important than just  intelligence”    🙂

 

Outboarders… keep those belts !

 

update… actually he said …..  (closee enough I guess)

“I am enough of an artist to draw freely upon my imagination. Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.”
― Albert Einstein

Joining AOMCI has priviledges 🙂

• This reply was modified 2 years, 1 month ago by crosbyman.
• This reply was modified 2 years, 1 month ago by crosbyman.
• This reply was modified 2 years, 1 month ago by crosbyman.

[Fastwin18]

Thanks seakaye12 and crosbyman.

See the attached images, the first image is what it looked like when I purchased it. I wouldn’t be surprised if it hadn’t run for 40+ years. Compression was 55 lbs and only one coil was working. A donor motor provided the second coil, and both cylinders have an excellent spark now. The old style breaker points are absolutely lovely, never saw anything like it before. After new piston rings and a new head gasket the compression now is 69 lbs, not too bad I think.  The final image shows it running earlier today. I was a bit worried about the water pump but as you can see it’s working fairly well. I also have the lower cowling and recoil starter, and both have already been painted. I will attach those once the engine runs a little  bit smoother.

Thanks for all your excellent support.

[kirkp]

Has to be the best looking test tank I’ve ever seen!

Kirk

[Fastwin18]

Ha! That was kind of a side project. Very happy with it, easy to move around the workshop, even when filled with water. I use it for all my outboards.

[stanley]

I was just thinking about building a tank from plywood!Is yours all plywood?What steps did you take to keep it from leaking?

[crosbyman]

great job on the  engine  wish I had skills and time..   🙁

 

 

Joining AOMCI has priviledges 🙂

[Fastwin18]

Stanley,

Yes it’s all plywood. What looks like varnish actually is 3 layers of clear epoxy coating on the inside and outside. This makes it both watertight and water proof.

It has 4 casters to enable manoeuvring it around, and a ball valve tap to drain the water. A lid keeps the water in at high speeds, but isn’t necessary for engines this size. The sloped front enables lifting the prop out of the water. The largest engine I’ve run in it is my 1960 fastwin 18.

1 user thanked author for this post.

stanley

[joecb]

Very nice work, both the motor and the tank. Congratulations. Also, My eye spies what appears to be a beautiful mahogany boat in the background. What can you tell us about that project ?

Joe B

[Author]

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