This old timer at a truck stop in Flagstaff told me to always use a brass punch on Cummins injector cups, but my shop manual says steel is fine.

He saw me struggling with a 6.7L job last month and handed me his personal brass punch, saying 'you'll crack the head if you don't listen,' so now I'm curious if anyone else has a strong opinion on this specific tool choice.

3 comments

3 Comments

juliarodriguez1mo ago

Man, that reminds me of my uncle's weird torque wrench ritual...

logan5611mo ago

Wait, a torque wrench ritual? That's not a normal thing. What did he even do with it? I have to know the weird steps. This sounds like a story that ends with something getting way over tightened.

reesej271mo ago

Wasn't he just setting it to the right spec for the job?