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Normally the Elto’s of that era used step-cut piston rings that were pinned. Crankcases evolved as production proceeded through 1928 but refer to this image here for more thorough info regarding which crankcase was used on which motor.
On page 5 here, you can see the codes assigned to each motor. You’re going to want to pay attention to codes #7 and #10 with regard to whether a given part belongs on your motor or not.
This one has info on part numbers for other powerhead parts
The reason for changes in the oil grooves could be numerous. If the factory changed anything in the production of these motors, they did so because it was an engineering improvement. Ole Evinrude was reputed to be very diligent in insisting that when motor quality issues came up that something be done about it and changes were often made on the fly.
To remove the tiller handle bracket bolts, they often have splines on them that get stuck to the bores they fit into, so some persuasion may be necessary with MAPS gas torch heat and a brass mallet to get them mobile.Obviously they have to be pushed into the centre and don’t try getting either one of them out if the other one is partially dislodged because you need every centimetre of space in that area to get them completely out of the crankcase casting webs.
Hope this helps.
Best,
PM T2He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
With regard to my post above, I use this booklet a lot when there are questions about what belongs on Elto motors built in the 1921-33 time frame. If you can get a copy of it, I urge you to do so. Over 120 pages of useful information is in it.
PM T2
He's livin' in his own private Idaho..... I hope to go out quietly in my sleep, like my grand-dad did..... and not screaming, like the passengers in his car...
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