Johnson 10 power head upgrade?

[enrico-italy]

I tried to made a 1960 "frankietwin" mixing a ’60 FD leg/gearcase with a ’60 QD PH and cover.

The project aborted because the lower cover front bracket of the QD cannot fit on the FD leg
I need to swap also the front carrying handle, but I suppose the steering pivots also not fit …

[Mumbles]

quote 1946Zephyr:

If you’re pushing a 14 foot boat though, stepping up to a ’57 Fastwin 18 is a better choice yet.

Agreed! An eighteen on a fourteen foot tinner is a great combination!

[1946zephyr]

I actually have a "Frankentwin" 18 that I just got running last weekend. It’s a 57 Fastwin with a 58 FD lower unit on it. The paint looks like hell and it’s been rattle canned, but this motor runs great. Those old 18’s are tough as nail and handle a lot of neglect and abuse. I think I’m going to put the lower back on the FD and restore it though. Plus do the same with the Fastwin. Both of my 18’s are factory electric motors.

[shoestringmariner]

Guys, I know this is an old thread, but will this upgrade work on a 1954 10hp powerhead?

[mr-asa]

quote Chris_P:

If you want to upgrade your pre ’61 10hp powerhead, order the following:

Wrist Pin 307849 x2
Connecting Rod 378330 x2
Piston 378285 x2
Needle Bearing 378251×2
Big End Needles 378150 x2
Piston Rings 378416 x2
Circlips 302577 x 4

Then if you have her apart, might as well change the carbon seal o rings

301967 x2

How far back does that go? Down to the QD14? the QD13? Any pre-61 10HP?

[dan-in-tn]

I believe it goes all the way back to QD-10? Someone will correct me if I am wrong.

Dan in TN

[Mumbles]

QD or Sportwin stuffings.These should all fit.

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[frankr]

Great picture!!! That pretty much explains it.

[1946zephyr]

I actually have a ’55 QD in pieces now. Fortunately, I found a good rod set out of a ’53, so I won’t need these mods this time. Will keep this in mind though.

[frankr]

Tip: The wrist pin bore in the piston is usually worn even worse than the bushing in the rod.

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