1959 35 hp evinrude longshaft to shortshaft

bleach68

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I have a 1959 35 hp longshaft evinrude and a 1957 35 hp shortshaft. Can I convert the 1959 to a shortshaft using the driveshaft from the 1957 ( taking the extension out) What about the water tube? Thanks
 

oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

'57 to '58 works. '57 to '59 likely, but need to check the splines (count them). The L.S. probably has a brass 5" connector for the upper and lower shift rod, which would be removed to convert. I think both motors have a straight water tube (not sure), and then would just cut the tube of the '59 five inches shorter. Be sure of the length before you cut it -- get a measurement from the '57, making allowance for the grommets.

can probably just switch out lower units if the '57 is working, if the housings match up (and the '57 l.u. works).

(on the water tube -- easier to just switch them out, come to think of it. Better not to cut if you can avoid it -- may want to convert back at some point.)
 
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bleach68

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Re: 1959 35 hp evinrude longshaft to shortshaft

Thanks! I was hoping that it would work! :)
 

HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

You don't have any options here sorry. Nothing will work, using the '57 drive shaft or direct bolt up.

In '58, the RDS went to a Super Quiet gearcase and dual line water pump, the secondary line recirculating via the thermostat. The '57 did not have a thermostat, nor the dual line water pump setup. All '59s were the dual line, with thermostats, so none of them will work as a bolt up. The '59 also has a different drive shaft altogether, and different impeller, so cannot simply swap drive shafts and pull out the extensions. Sorry.
 

oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

well, sorry here too bleach68 -- must be the switch took place for the '59 model year, as I switch between '57 and '58 OMC lower units. I'm familiar with the dual tube configuration High Trim describes, but only saw in post '59 models (couple of early '60s motors I had). But there is hope -- just need the right short shaft, as I see it. If you have the dual water tube, you probably have a turn in them at (I think) the lower unit grommets -- which would mean you would cut out the five inches at the top.

But I'll post that subject to correction or additions.... :)
 
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HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

It actually took place in '58, but only for the RDS (Super Sea Horse). The standard 35hp remained the same and could be interchanged.

Yes he could cut the water lines, but would still need the correct drive shaft.
 

HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

Let me edit this before someone calls me on it. I know it is coming. It CAN be done, but with a modification I don't recommend so don't mention it. I don't like crimping off the return line of the recirculating cooling system.
 

oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

ah, thanks H.T. I haven't had anything but the regular old bronze and white '58s (and then only parts motors, I think). Memory comes and goes like design changes, I guess. Thanks for the correction(s).
 
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oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

hmm. not sure where the crimping would come in, though.
 

oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

So bleach68 -- on board with this? Best to pull the lower unit on the long shaft, owing to the misinformation I passed along -- eyeball what you have. Will need the correct drive shaft (back to square one), and see what is needed to get to the shorter water tubes and shift shaft. Sorry. Post pics if you want (always helpful), and post a model number for the longshaft model. Differences between the '59 as described and the '57 should be pretty clear to the eye.
 

HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

hmm. not sure where the crimping would come in, though.

The second water line down from the thermostat is crimped and then actually "dead". Then the original single line water pump is used, and a custom water line made. It can be done, but most definitely not ideal. So better not to mention it.
 

oldboat1

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Re: 1959 35 hp evinrude longshaft to shortshaft

well, won't hear it from me.

Bleach68 -- would really like to hear what you come up with if you continue on (or decide not to). I'll look on and listen in.
 

bleach68

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Re: 1959 35 hp evinrude longshaft to shortshaft

Did they make a short shaft version for the 1959 lark Evinrude 35 hp? BTW I appreciate your help! Thank You! :)
 

racerone

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Re: 1959 35 hp evinrude longshaft to shortshaft

Not sure why all the confusion here.----They made long and short shaft motors in these years discussed.------There was however the different models in 57 and 58 model years.---The standard models and the super quit models and they do have different exhaust housings and water pumps.-----Post pictures of the 2 motors and exactly what you want to do !!!----Pictures and exact model #'s should be required on posts where the question is " will this fit that "-----
 
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HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

No confusion. He wants to do a conversion is all.
 

racerone

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Re: 1959 35 hp evinrude longshaft to shortshaft

..----The lower unit from the standard 57 model does not fit the 59 model..
 
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bleach68

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Re: 1959 35 hp evinrude longshaft to shortshaft

Hi! Thanks again for the help! The model for the 1959 is 50144 Lark 35 hp. The 1957 serial number is 25029 52565. Hopefully this will help clear things up a bit. The 1957 is very much in appearance like the 1956 lark 30hp, whereas the 1959 has the extra shroud around the upper part of the "leg" as well as a spacer above the lower unit. I have 2 of the 1959 motors that I will be getting the better one back up and running. The second I will keep as an extra. The 1957 I bought as an extra lower unit for my 1956 30 hp lark. Someone before me painted it Ronald McDonald shoes red!! It is not electric start. I will add some pictures in the near future (Once the weather warms up a little) Thanks again to all who have given me advice!! :)
 

racerone

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Re: 1959 35 hp evinrude longshaft to shortshaft

Driveshaft does not have a keyway for the 59 waterpump impeller.
 
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F_R

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Re: 1959 35 hp evinrude longshaft to shortshaft

'57 and '59 models have different drive shafts....period! The '57 water pump is driven by a pin. The '59 water pump is twice as big and is driven by a Woodruff key. There may be other differences in the shafts, I can't say for sure. I've never tried to do an improper swap.
 

HighTrim

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Re: 1959 35 hp evinrude longshaft to shortshaft

I agree with Frank above, of course!

I have 7 '57 Javelins Racerone, never seen what you are describing. I have 3 of the '58 Super Sea Horses, and they are the different key way drive shaft that take the bigger impeller, like the '59. All of my '57 Javelins share the drive shaft/water pump as all my standard '57 35hps, and will not work in my '59s or '58s like you mention. Not saying you are incorrect, but not sure what you mean. Have you seen '57 Javelins with the different drive shafts like in the '58s?

I just cannot see how you could say the '57 is a direct swap for a '59.
 
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