Quote:
Originally Posted by JLM78
What size Did you drill and tap the pump shift ?
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I used a #7 drill and a regular tap. No hardened tooling. The shaft seems to be case hardened, not fully hardened.
Go slow, use some clean oil to lube the drill and tap. Use compressed air to clear the chips out of the hole, prior to tapping it.
Use a new tap, you should be fine.
Drilling and tapping is part of my day job, I've done quite a bit of it over the past 31 years, so I may over simplify it.