Quote:
Originally Posted by Bob Bidonde
Remove the shear key and the Model A will not go. The axle will spin in the drum because the friction of the tapered axle-drum hub cannot react the driveline torque.
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Bob:
I agree. If key is removed/broken and torque on taper is to loose, car will not move. If torqued properly, car will still move even without key. However, the axel will eventually start spinning in hub and car will stop.
One of the reasons that axel keys break is to little torque on axel nuts which allows the hub to move on the axel straining the key.
I do not agree with you on this being a shear key/pin. You need the correct torque on the axel. That is one of the reasons a wheel puller is needed to remove the rear hubs. Wheel wobble is another reason for proper torque. The key also keeps the wheel from turning on axel when tightening the axel nut.
I have an orginal service manual. It states 100 foot pounds of torque, plus or minus. Some adjustment is needed to get the cotter pin in.
Loose rear axel nuts break keys, and cause ware on axels and hubs. Enjoy.