1956 Evinrude Big Twin

[myabuttz]

Re: 1956 Evinrude Big Twin

Well its time for an update!, I've had the LU gears sitting in kerosine of a month,I got the tapered roller bearing off with gear pullers, but broke the gear pullers (craftsman so its free) and got the reverse gear off and the shifter thingy that slides between the gears. then I got mad at the ball bearings and smashed them in a vice. really works good, I then wire-brushed the drive shaft to get the grime off. now I need to get the Bearings, ne body know if their like 20mm or bigger. and which company would you recomend, would like timken but kinda $$$, so i need a good deal and the bearings. Oh yeah I live near Columbus Ohio if ne body on here is from ohio. Thanks for the help!!!

 

[Paul Moir]

Re: 1956 Evinrude Big Twin

Thanks for the update Corey!<br /><br />It sounds like your into it up to your eyeballs now. <br /><br />The best place to get those bearings from a local bearing house. Have a look in the Yellow Pages. Some will only sell to industrial customers, but most have a little cash register somewhere.<br />Write down the part numbers you can find on all the bearings. For example, on my outboard I found my foward bearing was a Timken 12580 (cone) and a Timken 12520 (race). The cone is the part with the rollers, and the race is the tapered metal ring. Then take the numbers (and the bearings) to the bearing house.<br />I had a look online here and they wanted $10 for that exact cone and $5 for that race. That's a whole lot cheaper than an OEM bearing.<br />They'll probably have to measure the ball bearing. But if it seems to be 52mm x 20mm by 15mm wide, it probably is.

 

[horsefly38425]

Re: 1956 Evinrude Big Twin

corey make sure your forward/reverse dogs are in good shape.I put my 35 b/t together and had to go back in to weld them up /mill them down because they sliped bad /if she jumps out of gear take it eazy till you get'em fixed

 

[myabuttz]

Re: 1956 Evinrude Big Twin

yeah the gears are almost perfect, thats a plus.<br />you guys wouldnt happen to have the SN on the ball bearings towrd the prop end? I kinda destroyed them

 

[Paul Moir]

Re: 1956 Evinrude Big Twin

Can you accurately measure the width of the shaft, the reverse bearing bore in the LU, and the width of some bashed section of the ball bearing?<br />To measure the shaft ideally use a micrometer, but calipers will probably do. Make sure you measure the spot where the rev. bearing lands.<br />To measure the L/U bore, you could just check it with a ruler across the L/U cap (fin part) where the rev. bearing sits.

 

[myabuttz]

Re: 1956 Evinrude Big Twin

Well guys i've got every thing loosened up, but does anybody knoe the numbers on the bearings for the entire lower unit(total of three bearings). The bearing guys wont take my measurements w/the micrometer. Anything would help. Thanks

 

[myabuttz]

Re: 1956 Evinrude Big Twin

o yea, i need the shifter linkage in the LU, the thing were the shifting rod hooks up to shift the dog. anybody know where a good parts site is?

 

[Paul Moir]

Re: 1956 Evinrude Big Twin

Good used parts site:<br />Twin City Outboards<br />The folded sheetmetal part attached to the end of the shift rod is called a 'Shifter Lever'<br />The cast part that goes between the Shifter Lever and the clutch dog is called the 'Cradle'.<br /><br /><br />I don't know for sure what the 30hp numbers are, but we can figure them out if you can tell us your measurements.

 

[myabuttz]

Re: 1956 Evinrude Big Twin

Well for the aft tapered roller bearing I have for I.D. 0.850"<br /> For the foward ball bearing I have a measurement for the prop shaft as 0.815"(couldn't find the rest of bearing)and outside diameter of the bearing is 2.045 inches. <br /> Thats all I have now. I dont have the measurements from the upper drive shaft bearings, totaly forgot about it and will have to go back and check later. Thanks

 

[myabuttz]

Re: 1956 Evinrude Big Twin

Guys disregaurd the last post of bearing sizes. I have several old bearings siting around and I measured the wrong ones, so I'll Measure them later(tommrow)

 

[myabuttz]

Re: 1956 Evinrude Big Twin

Ok new bearing sizes:<br />Aft Ball bearing: Outside diameter 2.045"<br />and the propshaft thickness was .785"<br /><br />Forward Tapered roller bearing" Inside diameter.812"<br />and I dont know the outside diameter, <br />(lost the part)

 

[myabuttz]

Re: 1956 Evinrude Big Twin

the inside diameter of the ball bearing is probly .850"

 

[Paul Moir]

Re: 1956 Evinrude Big Twin

Aft Ball bearing OD: 2.045 = 52mm<br />Propshaft at ball bearing = 20mm<br />I bet the width is 15mm, which is the incredibly common standard 6304 ball bearing. Cost is less than $5.<br />Your forward tapered roller bearing bore seems to match my Timken 12580 (cone, or inner part) and Timken 12520 (race, or outer part), and the OD of that bearing is 1.9375" (check the size of your boss in the lower unit, where that bearing fits). It's about .78" wide.<br />Do you need to replace the driveshaft bearing too? Mine is Timken 09195 and Timken 09081, which is 1.938" OD x .8125 ID x about .78" wide. It is not the same as the bearing above - it's taper is different.

 

[cajun555]

Re: 1956 Evinrude Big Twin

I've got a 28 hp l/u tore down right now, the numbers Paul gave you are the same Timken numbers on mine. Checked for numbers on the rear bearing. No numbers on that bearing. I can't believe a bearing shop wouldn't measure bearing to make a sell.

 

[myabuttz]

Re: 1956 Evinrude Big Twin

Thanks guys, maybe the bearing shop will take these numbers

 

[myabuttz]

Re: 1956 Evinrude Big Twin

here's some photos, sorry for the low quality, but I wanted them to load faster<br />You'll have to go to this website to see them<br /><br />www.geocities.com/myabuttz/evinrudebigtwin.html<br /><br />www.geocities.com/myabuttz/evinrudebigtwin2.html

 

[myabuttz]

Re: 1956 Evinrude Big Twin

I think the motor hood looks great for almost fifty years old. You can see the shifter cradle looks like, I was wondering, do you think I might need a new seal around the prop end

 

[Paul Moir]

Re: 1956 Evinrude Big Twin

That top end looks sweet!<br /><br />While you have it torn down, I would reseal the whole thing. The only thing that's going to be a problem on the shift shaft seal, because the shift shaft bushing on that particuliar lower unit is a pain to drive out without the proper (special) tool. On the other hand, a dealer with the right tool can get it out in 5 seconds. Iboats or NAPA autoparts PN 18-2686 is the lower unit seal kit. Iboats sells it for about $17, and it includes a new driveshaft seal, propshaft seal, shift rod seal, spagetti seal, o-rings and even a pair of fill/drain screw seals.<br />That shifter lever doesn't look too bad. You might just want to sand off the rust and run it. Unless it's worse than it looks in the pictures and is falling apart.<br />I don't see the reverse gear thrust washer (metal plate) or the shift cradle there. You've got them around some place right?

 

[myabuttz]

Re: 1956 Evinrude Big Twin

yea I have the thrust washer, but i'm still sure what the cradle is because i thought, wait it just hit me what the cradel is. It's shaped like a "C" right, yeah thats in good condition

 

[myabuttz]

Re: 1956 Evinrude Big Twin

oh yeah, the shifter lever is shot. where the shift rod connects to the lever, well it broke or rusted through. I'm glad that motors been under a sheet for 30 years in my grandfathers basement. It looks really nice. I messed up the hood mount on the place where it mounts to the block. But I can probley make one. its the foward mount.