1952 Johnson 25HP (RD-13) crank seal?

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jpatti75
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby jpatti75 » Tue Jun 12, 2018 8:27 pm

10-4!

Thanks,
Jason
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jpatti75
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby jpatti75 » Tue Jun 12, 2018 11:00 pm

Alright, I was starting to get everything back together tonight, and my brain failed me on the carburetor linkage. How do I properly install these two pieces. The reason I ask, is that the piece on the left is not on my RD-12/13 diagrams, and I don’t see what purpose it serves (I’m not a smart man). I also noticed that I am missing the large linkage spring that connects to the piece on the right. :?

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david bartlett
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby david bartlett » Tue Jun 12, 2018 11:33 pm

Jason,

I found a picture in the Johnson Service manual that may help.
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jpatti75
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby jpatti75 » Tue Jun 12, 2018 11:48 pm

Thanks, David. I think the diagram is showing that the piece on the left goes on the linkage shaft first. The linkage rod connected to the carburetor gets connected to the top left hole on the piece on the right. If that is right, I still don’t see what role the piece on the left serves? It doesn’t appear to connect to anything?
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david bartlett
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby david bartlett » Tue Jun 12, 2018 11:54 pm

I have no idea about the piece on the left. Gotta love changes from year to year.
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FrankR
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby FrankR » Wed Jun 13, 2018 8:08 am

Recoil starter lockout???

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jpatti75
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby jpatti75 » Wed Jun 13, 2018 1:45 pm

I've been trying to find pictures of powerheads from the time period on the ol' interwebs. This piece certainly was gone by the time OMC switched to the cam rollers on the linkage in 1955. I've seen a couple powerhead pictures that don't show that piece, just like the diagrams I have for the RD-14/15. I am going to install it in the only way it looks possible to. It doesn't look like it at all comes into play on the carburetor function, so maybe it is some kind of recoil starter lock out like you suggest, Frank.

Does anyone have the part number for the spring that connects the linkage with a small tab on the manifold cover on the RD-13? 303296?

Thanks,
Jason
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FrankR
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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby FrankR » Wed Jun 13, 2018 3:19 pm

Closest thing I have is RD-14, shows a spring #303296

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Re: 1952 Johnson 25HP (RD-13) crank seal?

Postby jpatti75 » Wed Jun 13, 2018 5:43 pm

Thanks, Frank!
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