c/diesel-mechanics

Just realized the value of a clean shop floor after a talk with a retired mechanic.

Met an old guy named Frank at a truck stop in Amarillo. He said he spent his last 10 years just sweeping his bay spotless every night. Claimed it saved him 15 minutes every morning looking for dropped bolts. Started doing it myself last month. How many of you actually clean your bay daily?

3 comments

grant.olivia•1d ago

I just read that a single grain of sand can cause over $10,000 in damage to a modern diesel fuel injector.

Found that in a technical bulletin from a major engine manufacturer, and it makes me think our filtration standards are still playing catch-up. Anyone else run into a crazy expensive failure from a tiny contaminant?

3 comments

zara_sanchez•1d ago

Ran into an old timer at the truck stop in Bakersfield who said something about DEF systems that stuck with me

He was fueling his Peterbilt and saw me checking codes on a newer Freightliner. He said, 'Kid, you're not fixing a truck, you're babysitting a computer on wheels.' We talked for ten minutes and he said the real skill now is knowing when the sensor is lying. It made me think about how much of our job is just trusting the data the truck gives us. How do you guys decide when to ignore the fault code and just start checking the old-fashioned way?

3 comments

noahgreen•3d ago

Why does nobody talk about the torque spec for injector hold-down bolts?

I had a 6.7 Powerstroke in the shop last month with a bad injector seal. The customer said he'd just done the job himself. I pulled the valve cover and found three of the four hold-down bolts were barely finger tight. He told me he 'snugged them up good' but didn't use a torque wrench. That extra 15 foot-pounds matters a lot to keep the injector seated right against the high pressure. How many of you have seen this cause a comeback?

3 comments

wilson.lee•3d ago

Changed my tune on those cheap torque wrenches after a head gasket job

I always used the shop's good torque wrench for head bolts, but mine broke so I grabbed a $40 one from the parts store. It felt fine setting it, but when I checked with a borrowed Snap-on after the first pass, it was off by almost 15 foot-pounds. Had to back everything off and start over, which cost me half a day. What's a good mid-range brand you guys trust that won't break the bank?

4 comments

fionam11•5d ago

Had to choose between a new torque wrench or a used scan tool for my work truck

My old torque wrench was off by a good bit, and my cheap code reader couldn't talk to the newer rigs. I had about $400 saved up. I went with the new torque wrench, a 1/2-inch drive model from GearWrench, because I figured proper bolt tension is more basic and critical. It's been solid for head gasket jobs, but now I'm stuck when a 2020 Freightliner rolls in with a weird code. Anyone have a decent budget scan tool they'd suggest for under $300?

3 comments

lee18•6d ago

Bought a 'rebuilt' injection pump off a guy in Tulsa... it lasted 27 hours.

I was in a bind on a 6.0 Powerstroke and this guy swore it was a solid unit for $850. Got it in, truck ran great for a day and a half, then it just quit. Tore it down and found cheap, worn-out internals that were clearly just cleaned up, not rebuilt. Lost the pump cost, plus two full days of labor I had to eat. Learned the hard way that a deal from a random shop van isn't always a deal. Anyone know a legit source for reman pumps that won't blow up in a week?

3 comments

hollybrown•6d ago

Wasted $80 on a 'universal' DPF pressure sensor that didn't fit

I was in a rush and grabbed one off the shelf at the parts house, assuming it would work on a Duramax. The connector was wrong and the threads were off, so I had to order the right one anyway. Anyone have a go-to brand for sensors that actually match the specs?

3 comments

shane357•8d ago

My recent close call with a mis-fueled diesel engine

Last month, a customer brought their diesel truck in for rough running. We thought it was a filter problem, but we wasted hours before finding gasoline in the tank. The shop lost money because we didn't ask about their last fill-up. Now I always check fuel history right away. It stopped another awkward chat with a client just last week.

3 comments

tyler_bailey89•10d ago

Trying to convince my old man to either fix or scrap his diesel beater

My dad has this beat-up diesel truck from the 90s. It hasn't run in five years. Every time I offer to help get it going, he says he'll do it himself but never does. Last week, I found rodents nesting in the engine bay. I'm concerned it's a hazard. Has anyone else had to push a family member to make a decision on a project vehicle? I don't want to overstep, but it's frustrating.

3 comments

alice928•10d ago

Heads up on the diesel quality at the River Road station

It's been causing rapid filter failure in my area.

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patel.eric•11d ago

Struggling with low power on my converted diesel boat engine

I swapped a small diesel into my fishing boat last year. It idles fine but loses all guts under load. I replaced the fuel filter and bled the system twice. The injection pump timing seems right from my marks. No black smoke or weird noises, just no pull. Could it be a worn injector or something in the lift pump? I'm stuck and the fishing season is coming up fast.

3 comments

jordan_henderson13•11d ago

My friend's acetone experiment left my diesel knocking

My buddy said adding acetone to diesel would clean the injectors and add power. I let him do it to keep peace, and now my truck has a constant knock at low speeds. Ever get bad advice from someone who isn't a mechanic? How do you handle it without causing a fuss?

3 comments

ryant50•12d ago

Passed up easy money by refusing to cut corners on a transmission rebuild

My reputation is worth more than a quick profit.

3 comments

beth_hernandez•13d ago

Maple Street biodiesel is giving filters a hard time

Over the past month, three trucks in my shop came in with the same problem. All had filled up at the new biodiesel station on Maple. The filters were packed with a waxy residue. It seems their blend doesn't play nice in cold weather. One owner had to replace the entire fuel system. I'd avoid that place until they sort it out. Save yourself a tow and a headache.

5 comments

scott.ryan•17d ago

Tinkering with an old generator showed me how to spot bad diesel fast

I picked up a beat-up diesel generator from a yard sale to fix in my free time. It kept sputtering out after running for a bit, and I was sure the injectors were clogged. Instead of pulling them right away, I tried a simple trick my dad once mentioned. I drained a small sample of fuel into a clear jar and let it sit for a minute. If you see a layer of water or specks at the bottom, the diesel is contaminated. This quick check saved me hours of work because the fuel was just dirty, not the parts. Now I always test the fuel first on any diesel engine that acts up. What's your go-to method for checking fuel quality without a full kit?

4 comments

haydens86•18d ago

Got into a spat with a buddy over torque specs at a BBQ last weekend

At a family BBQ last weekend, my buddy and I got into it over diesel engine torque. He insists on following factory specs to the letter, but I've always gone by the feel of the wrench... you know? We were so focused on arguing that we let the burgers char to a crisp. Some guys say his way avoids come-backs, others say my method gets it done right. What's your take?

4 comments