1957 Johnson 35hp short to long shaft

Thomas73 · Tuesday at 12:29 PM

Hello all. I just picked up a 1959 lone star El Dorado and looking for a new outboard for it as the one it came with has a lost title. I found twin 57 Johnson 35hp sea horses nearby for $500. Last ran around 2020. Electric starter, 12v generator, all wiring, control boxes, and throttle remote included. And most importantly, titles in hand for both.
Only issue is they are both short shafts, and the boat measures 21" at center of transom. Would really like to use the engines in the boat. So my opinions are find the parts to convert them to long shaft, or much less desirably, use a drop down plate to mount them.

How available are the parts to convert these to long shaft?

racerone · Tuesday at 12:59 PM

Should be easy to find the parts.----Your location ?----Look on E-Bay for the kits.

Thomas73 · Tuesday at 1:30 PM

Central Texas. Any idea where to find a part number for the kits? Did some looking online but didn't come up with anything. Im use to running i/o. This is my first experience with outboards

Crosbyman · Wednesday at 8:00 AM

see personal message in small enveloppe top right

before spending to much $$$$ do basic checks ... like compression .

Duckworks Magazine

visit AOMCI site where oldies are the main focus..lots of support available under
ASK A MEMBER .

Antique Outboard Motor Club,Inc

www.aomci.org

Crosbyman · Wednesday at 8:09 AM

to service your oldy all you need in is in this book...cheap for 600 pages $20

1922-1964 Johnson 302231 Outboard Service Manual

Johnson Outboard Motor Service and Repair Manual # 302231 Tenth Edition covers all Models 1922-1964 .pdf download

watercraftmanuals.com

airshot · Wednesday at 11:37 AM

Or, look for some donor motors that have long shafts. If I remember correctly, in those days, that 5" extension could be added or removed whatever you needed. Back in those days, long shaft motors were a little scarce around my neck of the woods, but lots of used kits were around. Happy hunting !

Thomas73 · Wednesday at 1:25 PM

Awesome, thanks! And i assume its more than just the housing needed. Drive shaft, water tube and shift linkage are things i think of i would assume need to be changed aswell.

And yea I'll definitely be bringing my compression tester with me to look at them. Assuming good compression and seeing if the shifter engages, does that sound like a good price to y'all? I don't really know what these would go for. Only others ive seen nearby are in pretty poor condition

jimmbo · Wednesday at 1:37 PM

Does it have a Spark strong enough to jump a 5/16" Gap?
If you use the Pull Stater for the compression Test, you will have to disable the Compression Relief Mechanism. If using the Starter Motor, not necessary.

racerone · Wednesday at 1:57 PM

In my opinion 1957 motors need a total evaluation of condition.----Tear down / inspection / replacement of consumable parts.----Unless they have warranty / proof that it was done recently.

Thomas73 · Wednesday at 2:33 PM

racerone said:
In my opinion 1957 motors need a total evaluation of condition.----Tear down / inspection / replacement of consumable parts.----Unless they have warranty / proof that it was done recently.

I am already assuming they are going to need a going over regardless. Water pump, lower seals, all the consumables like you said.

1957 Johnson 35hp short to long shaft

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