c/diesel-mechanics

Just hit 10,000 hours on a 6.7 Powerstroke I've been the only mechanic for

Honestly, I was doing the service on my buddy's 2015 F-250 yesterday and the scan tool showed 10,012 engine hours. I've been the only person to turn a wrench on that truck since he bought it new. Ngl, seeing that number felt pretty good. It made me think about all the little things I've done to keep it running smooth, like sticking to the 5k oil change interval with Rotella T6 and catching a small high-pressure fuel pump weep at around 7,500 hours. The truck still pulls his equipment trailer every day without a hiccup. It's a solid reminder that consistent, careful maintenance really pays off long-term. Has anyone else hit a crazy high hour mark on a rig they've maintained from the start?

A loose injector line on a Detroit 60 series almost started a fire in my shop

I was doing a routine service on a dump truck in Phoenix when I smelled diesel and saw a fine mist spraying from a line nut. It was hitting the hot exhaust manifold. I shut it down and found the torque spec in the manual was way off from what I'd been using. Anyone else run into bad torque specs on older service manuals?

Question about replacing a turbo on a 6.7 Powerstroke, went with a reman unit and it's been a headache

Had a customer's 2015 F-250 with the turbo making that awful metal-on-metal noise last week. The choice was a brand new OEM turbo for $2,100 or a 'certified reman' from a big parts house for $1,400. Went with the reman to save them some cash, installed it Friday. By Monday, it was back on the lift with a massive oil leak from the center cartridge. The shop that built it is giving me the runaround on the warranty claim, saying it was an install error. Has anyone else had a bad run with reman turbos lately, or should I just start pushing new units only?

Just lost a whole afternoon and $80 on a 'universal' EGR cooler gasket that didn't fit my 6.7 Powerstroke.

I thought those fuel additive test strips were a gimmick until my boss made us use them

We had a truck with a rough idle that kept coming back, and after the third injector clean, my boss in Omaha bought a pack of those diesel fuel test strips. I rolled my eyes, but we dipped one in the tank and it showed high water content right away. Turns out the station's underground tank had a leak, and water was getting in. We drained the whole system and the problem was fixed for good. Has anyone else found a simple tool that actually solved a tricky issue?

I spent a whole day trying to get a seized bolt out with a torch and a cheater bar before I remembered my little impact driver.

This was on a 6.7 Powerstroke oil pan, and the bolt was just not moving. I had the torch cherry red, a four-foot pipe on my breaker bar, and I was basically doing a workout. My buddy walks over, grabs my Milwaukee M18 Fuel impact, puts a socket on it, and zips the bolt out in two seconds. I felt like a complete idiot for overcomplicating it. Has anyone else had a moment where you went full caveman on a job before remembering the simple tool that does it better?

My uncle, a fleet mechanic for 40 years, insisted I use a dab of anti-seize on injector threads, and it saved me from stripping the aluminum head on a 6.7 Powerstroke last month.

He said 'a little goes a long way' and after seeing how clean the old ones came out, I'll never skip that step again, so what's one old-school trick you swear by that the new guys might not know?

Just realized my worst day in the shop was also my best learning moment

Last Tuesday in Tulsa, a 6.7 Powerstroke came in with a no-start and we chased a phantom electrical gremlin for eight hours. My lead tech, Carl, finally found a corroded pin in the main harness connector that we all missed. It was a brutal shift, but I learned more about voltage drop testing that day than in the past six months. Has anyone else had a miserable job that taught them a trick they still use?

Saw a fleet of old school buses converted to RVs at a campground in Flagstaff

I was camping up near Flagstaff last weekend and the site next to me had three old Blue Bird buses parked. Got talking to the owner, and he said he does all the diesel work himself, including swapping the original engines for newer 6.7 Powerstrokes. He showed me his homemade intercooler piping, which was all hand-bent aluminum. Has anyone else here done a full drivetrain swap on a heavy vehicle like that? I'm curious about the mounting challenges.

Just saw a guy at the yard use a heat gun on a seized injector

I was grabbing parts at the Tacoma Freightliner yard yesterday and watched a mechanic work on a 6.7 Powerstroke. He had a stuck injector and instead of reefing on it, he carefully heated the aluminum head around it with a Milwaukee heat gun for about two minutes. He said, 'The aluminum expands faster than the steel, gives you a little window.' It popped right out with a slide hammer. I've always just used penetrant and force. Anyone have a different trick for this?

Changed my mind on those cheap glow plug testers after a bad call

I had a no-start on a 6.0 Powerstroke last week, and my old cheap tester showed all four glow plugs on the passenger side were good. Spent two hours chasing wiring before I grabbed a buddy's Snap-on unit, which showed two were actually dead. The cheap one just gave a weak light for a bad circuit. Anyone have a go-to brand for a solid glow plug tester that won't lie to you?

I finally had a 6.0L Powerstroke that didn't fight me for once

Last Thursday, the injector swap on a customer's truck in Boise went perfectly, with no snapped bolts or stripped threads. Has anyone else had a job that went suspiciously smooth after a string of bad ones?

Had a turbo oil feed line blow on a 6.7 Powerstroke during a test drive

It happened yesterday afternoon about 3 miles from the shop. The line was a cheap aftermarket part the owner put on a year ago, and the crimp fitting just let go. I had to limp it back with a huge cloud of blue smoke behind me, lol. Anyone know a good brand for those lines that actually holds up?

Had a 6.7 Powerstroke come in with a rough idle and no codes...

The owner said it started about a month ago and was getting worse. We pulled the valve covers and found the rocker arms on cylinders 3 and 5 were just loose enough to mess with the valve timing. After we torqued everything back to spec, the idle smoothed right out. Has anyone else seen rocker arm issues cause problems without throwing a DTC?

Rant: A fleet manager told me my injector cleaning method was too aggressive

I was cleaning a set of injectors for a 6.7 Powerstroke using my usual ultrasonic bath and a strong solvent mix. The fleet manager for a local delivery company saw my setup and said, 'You're cooking the seals and the plastic guides, they won't last a year.' He showed me the service bulletin from Ford that specifically warns against certain chemicals. I switched to the OEM-approved cleaner and reduced my bath time from 30 minutes to 12. The difference in part wear after 6 months is huge. Has anyone else had to completely change their chemical process after getting called out?

Shoutout to the old timer who told me to use a zip tie to find a vacuum leak on a 7.3 Powerstroke

I spent a whole afternoon spraying starter fluid around the engine bay with no luck, but his trick of holding a thin zip tie in the suspected leak path and feeling for the pull found the cracked boot in about 30 seconds, so what's the strangest tool you've ever used to fix a diesel?

Just hit 500 hours on my rebuilt 6.7 Powerstroke without a single check engine light, which is wild because the last one I did threw a code at 80.

I used to think those magnetic oil drain plugs were a total gimmick

A guy at the shop in Tacoma kept telling me to try one on my old 7.3, and I finally did about six months ago. When I pulled it for the first oil change, it was covered in tiny metal bits I'd never seen on a normal plug. It convinced me there's something to it, even if it's just catching wear particles early. What's a tool or trick you thought was nonsense until you tried it?

Pro tip: I tried using a regular socket on a Cummins ISX fuel line fitting and it was a comedy show

Had a 2015 Freightliner in the bay last week with a weepy fuel line. My good flare nut wrench was on another job, so I thought, 'how bad could a regular 12-point socket be?' Bad. Real bad. I got it on there, put some pressure on the ratchet, and the socket just rounded off the fitting's corners like it was made of butter. Spent the next hour trying to get a grip on this shiny, smooth nub I'd created. Finally dug out my old, beat-up snap-on flare nut wrench, the one with the super thin walls. It bit right in and the fitting came loose with a normal grunt. The difference was night and day. That thin wall on the right tool makes all the space it needs without slipping. Anyone got a good trick for getting a rounded fuel fitting off when you're already in that deep?

TIL my stubbornness cost me a whole weekend on a 6.7 Powerstroke

Spent 12 hours chasing a no-start, convinced it was the FICM. The actual problem? A $20 crank sensor with a hairline crack you could barely see. Anyone else ever get totally blindsided by something that simple?

Pro tip: I had to choose between a new torque multiplier or a rebuilt one for a stubborn axle nut

Went with the rebuilt unit from a local shop in Boise, cost about half. It handled the job on a Duramax just fine, but I'm curious if anyone has a go-to brand for new ones they trust long-term.

A trick with a zip tie saved me an hour on a 6.7 Powerstroke oil cooler job

Was doing the cooler on a 2015 F-250 in the shop, and the lower bolt on the housing was a nightmare to get a socket on. Instead of pulling the fan, I took a long zip tie, looped it around the bolt head, and used it to pull the bolt out just enough to get my fingers on it. Got it out in maybe two minutes instead of fighting with extensions and swivels. Anyone got a better trick for those tight spots behind the radiator?

Had a turbo feed line blow out on a 6.7 Powerstroke yesterday

I was doing a routine oil change on a 2015 F-250 in the shop when I heard a loud hiss and saw oil spraying. The braided line from the block to the turbo had a pinhole failure right at the fitting. Truck had about 140k miles on it. I had to shut it down fast and spent the next three hours cleaning oil off everything and replacing the line. Has anyone else seen these factory lines fail around that mileage, or was this just a fluke?

A customer in Boise told me his 6.7 Powerstroke was 'just a little loud' before I found the turbo had eaten itself.

He'd been driving it like that for a month, said the whistle was 'kinda neat'. Ever had someone ignore a sound that bad for that long?

Just dropped $350 on a new torque wrench for head bolts and it was worth every penny

Had to do head gaskets on a 6.7 Powerstroke last week and my old clicker wrench was way out of spec. Bought a Snap-on TechAngle and it made the whole job feel way more solid, no guesswork on the angle turns. Anyone else have a go-to tool that seemed pricey but totally saved a job?