The water pump is located behind the steering yoke. You can see the piston behind the yoke in the attached photo. PM me your email address and I’ll send you the operators manual for your motor. If you are a Facebook user you can download the manual from “The World Needs More ELTO’s” page. I would have posted it here in the archives along with my large collection of manuals, but we don’t allow it for some reason.

Interesting that the pump mounts up that high, and in the same location
as my 1925 Lightwin / Ruddertwin with no water pump.

I have the Elto Rudder Twin A & B manual from that site, but it’s too large a file (3.6 mb)
to upload here, or email you directly, but if you PM me your email address I can try
to send it via “We Transfer”.

There were 2 types of early water pumps. One as shown in the picture has the piston that is actuated by a cam on the driveshaft. The other type, which in my opinion was problematic, had a “connecting rod” that was connected to the cam on the driveshaft. Exhaust gas which had oil residue was the lubricating mechanism. As wear took place, the “connecting rod’ would sag, and at some point, bind, with the result being catastrophic. I had an early 1922 with that type and when it let go, it blew a hole where the exhaust cutout was on the side of the mid section.

George

• This reply was modified 1 year, 9 months ago by george-emmanuel.