Quote:
Originally Posted by Terry, NJ
Or put another way, today's lubricants are higher quality and better suited to the job than anything from 1930. Steam Cylinder oil?
Terry
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The oil Ford used in transmission and differential was dictated by the gear tooth cut design. These are flat face spur gears (unlike modern helical or hypoid cut gears).
Flat face spur gears have direct flat metal to metal gear face pressure when under load. To lubricate them you need a thick, sticky oil so that an oil film forms to keep a pad between the two metal surfaces. Steam cylinder oil is thick and sticky.
Modern gear oils are good for modern gear cuts.
See:
https://khkgears.net/new/gear_knowle..._of_gears.html
