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Cox car (Riviera and others)  fan/flywheel/drive gear - Page 2 Empty Gurney Eagle gear needed!

Post  pertti_jarla Thu Aug 25, 2022 3:56 am

Greetings, nice to join this interesting group.
I am trying to restore the Gurney Eagle tether car. The gear on the axle has unfortunately lost several teeth. The part number is 9648. The problem is, there is a Cox 9648 Gurney Eagle gear for sale in Ebay, but mine is a spur gear and that is a contrate!
I don´t suppose anyone has a spur type 9648 gear to sell?? I live in Finland myself, but order stuff from USA frequently with no problem.


Last edited by pertti_jarla on Thu Aug 25, 2022 7:24 am; edited 1 time in total
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Post  getback Thu Aug 25, 2022 5:51 am

I can't find a brake down but this is a spur gear will work don't know i think he is doing 3D print so you could contact him and get more info https://www.ebay.com/itm/223996085877?
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Cox car (Riviera and others)  fan/flywheel/drive gear - Page 2 Empty Gurney Eagle substitution gear attempt

Post  pertti_jarla Tue Sep 27, 2022 11:04 am

I got a replacement spur gear for my Gurney Eagle from a US company called goBILDA. I think you can order the same part straight from China. The number "1" on the original gear appears to have been misleading, a 40 tooth gear with 1 metric pitch would be bigger. The one I found is 0.8 pitch 40 tooth with about the same dimensions. Even the axle hole is hexagonal, Cox style.

Cox car (Riviera and others)  fan/flywheel/drive gear - Page 2 30897012

It seems to mesh well with the motor pinion gear. However, there are differences that have to be modified:
-The axle hole is too large, metal tape or something is needed for a tighter fit.
-The tooth face width is a bit too much and may have to be filed down.
-Most importantly the stem is too thick, touches the motor flywheel end and prevents the teeth from meshing. The stem has to be thinned down, hopefully with the set screws still useful.

Original gear and new gear
:
Cox car (Riviera and others)  fan/flywheel/drive gear - Page 2 30872112Cox car (Riviera and others)  fan/flywheel/drive gear - Page 2 30935911
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