When your hot your hot even if the pump drive is not

As I recall my brother hardened up wire/rod straight cut machine shearing dies that were made out of a short length of round stock. Nothing more than a certain hole size in the middle of the round. Heat it to orange and promptly drop it in a quart of oil. Allow to cool. Then re-heat till dull red and let cool. The only test was to put it in the machine and see how many rods ya' could cut. Easy to swap in another when needed. Maybe not so easy (or cheap) with failure in an engine.