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>> Home > Forum > Boat Specific Chit Chat! > ELAINE, MOTOR CLEAN UP.
Author Message
Colin H.
(Fleet Admiral!)

Forum Posts: 437
8th Sep 2018 14:18  
>> Permalink

Well here it is, 10.35mm bore with 16.19mm stroke. The flywheel is 41mm dia and 12.5mm thick weighing in at 117gms. As you can see from the pictures it was a pain to strip, but as I was desoldering the water jacket the head came loose, so I unscrewed it. Then carefully stripped the rest and cleaned each piece, finally returned to the water jacket, I had to remove the outer sleeve then cut the screws to remove the top and bottom discs. Next I removed all the crap that was stuck in the fins and cleaned the cylinder head jacket. Finally re-assembled. All that work and still don't have any idea of the maker. There is a number on one of the mounting webs 685, on the other side is a number 2. But the Web is broken. The flywheel has RMA stamped on it and a letter J above it. So mateys what's the verdict. And god alone knows if I am able to rebuild the water jacket.
Cheers Colin.

Attached Files - Click To View Large

Fair winds and calm waters,
(Fleet Admiral!)

Forum Posts: 797
8th Sep 2018 21:58  
>> Permalink

Hugely long stroke, Colin and I've never seen such a long piston. I am truly astonished that you got even a fart out of it, much less a run. I'm assuming it was built as a marine engine or would you say the finned barrel of an aero engine has been turned down to fit the water jacket?
A very large shouldered top to the crankcase. It really is a mystery.
I can only suggest home made.

Edited to say it's 1.36 cc., so a bit of a nipper.

Colin H.
(Fleet Admiral!)

Forum Posts: 437
8th Sep 2018 22:27  
>> Permalink

The fins look like they haven't been touched, the home made water jacket is basically 2 brass washers with 4 screws clamping them tight to the alloy cylinder head, then a copper wrap around soldered on with 2 pipes soldered into the wrap. The fins were full of baked sludge, but luckily cleaned up with a fine needle and small swede brush. Cheers Colin.

Fair winds and calm waters,

Forum Posts: 2
9th Sep 2018 08:06  
>> Permalink

It's a Mills 1.3. nice old engine.