TIL an old diesel mechanic taught me a trick about injector cups that saved me a headache
I was working on a 2006 Freightliner in a shop near Nashville last month and this older mechanic, must've been around 65, came over and watched me struggle with a stuck injector cup. He just laughed and said "son, quit hammering on it, grab your torch and heat the block around it, not the cup itself." I'd been at it for an hour with a slide hammer and getting nowhere. He showed me his method: heat for about 90 seconds on the outside of the bore, then a quick tap with a brass punch. That cup popped right out on the first try. Has anyone else run into an old school trick like that that completely changed how you approach a job?