Magneto Coupling Material

[MochetVelo]

The Bosch magneto on the 1915 Overland I'm repairing has a 1/4" leather engine coupling. Is this acceptable? 

 

Phil

 

 

[cahartley]

I have a hunch it might have been replaced.

Every flexible coupling like yours I've seen have been of woven fabric, some rubberized and some not.

[MochetVelo]

I agree. I ask because I've always seen fiber-reinforced rubber material used for this purpose (kind of like conveyor belt material). On the other hand, it would seem leather would also work.

 

Phil

[PFitz]

Leather wouldn't hold up well to getting wet. It stretches very easily then. When wet, the bolt holes would likely become a sloppy fit. Each time it got wet it would stretch and thin out even more.  The rubberized discs were much more weatherproof and stronger for generator/mag water pump drive couplings, and in drive shaft and clutch disc hub couplings. The modern equivalent is even more weather proof, oil proof, and much stronger than the original rubberized discs.

 

Some that I make -  Marmon generator drive rings, a Franklin flexible hub clutch disc, and Nash drive shaft u-joint discs .

 

Paul

Edited April 8, 2019 by PFitz (see edit history)

[Mark Shaw]

I bought a magneto coupler online that was 3D printed.  It is working perfectly (after I smoothed the mating surfaces).