Took me 4 years to realize I was overtorquing injector hold-down bolts

I used to crank those things down till they felt solid, killed two sets of injectors in my 6.0 before I figured it out. Then a buddy handed me his inch-pound torque wrench and showed me the factory spec is only 48 lb-ft. Felt wrong at first but my last set of injectors has been running smooth for 18 months now. Anyone else trust the click or do you still go by feel?

3 comments

3 Comments

alexw751mo ago

Man, tell me about it. I did the exact same thing on my 7.3, thought I was building it like a tank. Killed a set of cups before I wised up and actually read the manual. That first time I torqued them to spec it felt like I was leaving them loose, but the truck ran way better. It's wild how much difference a few pound-feet makes on injectors, that "feel" is basically just a guess. Now I'm a torque wrench guy for anything that seals against oil or fuel.

the_rose26d ago

Gotta admit, I used to be in the 'feel it out' camp myself until I messed up a set of injector seals on a buddy's truck. Took me forever to learn my lesson. @piper_burns has a good point about the lube thing though, that's a whole other can of worms with the clamping force. Makes you wonder how many torque wrenches out there are just lying to people.

piper_burns1mo ago

48 lb-ft on those 6.0 injectors and I still double check the wrench clicks because it sounds wrong. But honestly I stopped trusting torque wrenches on a lot of stuff after my Snap-on went out of calibration without me knowing. I just check it with a beam style torque wrench every other year now. Plus not all fastener threads are created equal, some need oil, some need antisieze, and that can add up to 10-15% difference in clamping force no matter what the wrench says. So I still go by feel for a lot of things, but I'll use the wrench as a guide and then snug them a hair more if the threads feel dry.