'54 evinrude 7.5hp bolt up to a '57 johnson tower?

[jbjennings]

I was curious if a '54 7.5hp evinrude block bolt onto a '57 johnson midsection? I was hoping one would and work perfectly if I change out the intake manifold and cylinder head from the '57 johnson onto the '54 evinrude block. My 7.5hp johnson block is bad and I may have found a '54 7.5hp that might work.
Thanks,
JBJ

 

[F_R]

Re: '54 evinrude 7.5hp bolt up to a '57 johnson tower?

Not 100% sure, but I think the answer is no. Er, that is yes it will bolt up but the gasket pattern is different. At least I know the '57 gasket won't work on the '54 midsection. What I don't know for certain is whether or not the pattern was also changed on the block.

 

[HighTrim]

Re: '54 evinrude 7.5hp bolt up to a '57 johnson tower?

The driveshafts differ in length as well. When you bolt that powerhead up, she will seize up.

I seem to recall going through this same thing last summer, but I was trying to swap gearcases.

 

[jbjennings]

Re: '54 evinrude 7.5hp bolt up to a '57 johnson tower?

Dang, I've been looking for a while for a powerhead for this thing. Seems like parts are getting harder and harder to find for the old motors. I guess the hunt is half the fun.....
I sure do appreciate the info!
JBJ

 

[HighTrim]

Re: '54 evinrude 7.5hp bolt up to a '57 johnson tower?

JBJ I may be able to help. Let me have a looksee downstairs.

 

[jbjennings]

Re: '54 evinrude 7.5hp bolt up to a '57 johnson tower?

Hightrim, you know this is not my only outboard, so don't go to any trouble on that!! I think I have about 10 outboards from the '50s. But I love to hear one crank up the first time. I got this one in pieces on a trade a while ago, and it has a totally new ignition, water pump assembly, and carb kit. The pistons were shoddy and the crank was rust pitted....
Thanks,
JBJ