1952 RD-13 Johnson 25hp

[Vintage Boat Guy]

Hi I recently bought a 1952 Johnson 25hp that I made using parts from my 1954 Electric start RDE-16 Johnson 25hp, I broke the key on the crankshaft on the 1952 after driving it for awhile after having the flywheel not torqued properly. I would like to know what newer outboards use the same key for the crankshaft to flywheel, is the 1955 model the same part number? Is there a number I can give to my local OMC dealer that they can use to order the part? Thanks

 

[HighTrim]

Part number 302602. Shared by many models.

 

[Vintage Boat Guy]

That was the number I found for the 1955 model, is there a website that gives a detailed list of parts numbers for these old outboards? Is the 1955 powerhead the same as the 1952?

 

[F_R]

Similar to but not 100% same as. If you go to Ask-A-Member forum at www.aomci.org and ask, somebody there probably will post the parts book. Or give you one by e-mail​

 

[Vintage Boat Guy]

That page would not work for me, what is the key worth roughly?

 

[samo_ott]

I have the parts manual if you want to PM me your email address and model #.

 

[Vintage Boat Guy]

This outboard keeps breaking the key, how would you suggest I tighten the flywheel down to the recommended torque? 100ft lbs correct?

 

[F_R]

No!!! 60-65 foot pounds. 100 may spread or break the hub. Both the hub and shaft tapers must be in good condition, and clean and dry. Then torque to spec. Use a strap wrench to hold the flywheel while you wrench on it.

 

[Vintage Boat Guy]

Thanks for your knowledge, I'll give that a try

 

[racerone]

The tapers must be a perfect fit.---Use some fine valve grinding compound to lap them together.--After that procedure you will not shear the key again.

 

[Vintage Boat Guy]

I made a key out of key stock and it runs great. Samo_ott I would appreciate your offer, but I forget how to pm someone.