c/auto-mechanics

Lost $200 on a "rebuilt" alternator from a sketchy online seller

I bought a remanufactured alternator off a random parts site for my 2012 F-150, thinking I was saving cash over the dealer price. It died completely after just 3 months, and when I pulled it out the bearings were totally shot and the casing had a crack I didn't catch at first. Has anyone else had bad luck with cheap rebuilds, or did I just pick the wrong seller?

3 comments

brooke_murray•2d ago

Customer's torque wrench was 50 ft-lbs off, nearly ruined my repair

Had a guy bring in his 2015 F-150 last Tuesday, wanted me to check why his lug nuts kept coming loose. Grabbed his own torque wrench off the seat to show me what he was using. Turns out it was clicking at 100 ft-lbs when he set it to 150, been dropping them by hand for months. I got out my Snap-On and showed him the difference on the spot. Anyone else had a customer's tool cause more problems than it fixed?

3 comments

river_thompson•5d ago

Had a total game-changer moment at a shop in Phoenix last month

I was helping out at a buddy's garage near downtown Phoenix when a old school mechanic pulled up in a 94 F-150. He popped the hood and pointed at how I was routing my vacuum lines, said they were all twisted and pinched in spots I couldn't even see. He spent like 10 minutes showing me this trick of using zip ties to hold the lines in place before clamping them down. Ever since then, I check every line for kinks before I finish, and I've had zero come-backs on vacuum-related jobs. Has anyone else run into a random stranger who completely changed how you do a basic task?

3 comments

ray_burns•9d ago

Tried running a cheap oil flush on my 2012 F-150 at 120k miles

Grabbed that $8 bottle of engine flush from AutoZone in Cleveland last week. Followed the directions to the letter, 5 minute idle then drain. Next thing I know the oil pressure light flickers at every stop sign and I got a bad knock from the passenger side. Learned the hard way that sludge can be holding your engine together on high mileage motors. Any of you guys had a flush turn a runner into a parts car?

3 comments

cora_west5•11d ago

Why does nobody talk about using the wrong oil weight for older engines?

I’ve been wrenching on my ‘92 F-150 for years and always used 10w-30 because that’s what the manual says. Then I talked to a guy at a parts store in Tulsa who said I should be running 5w-40 in summer due to heat and wear. He showed me how the thinner oil was causing lifter tick after 3,000 miles. Now I’m split between sticking with the factory spec or trusting real-world experience. Anyone else have a moment where a veteran mechanic called them out on oil choice?

3 comments

barbaradavis•12d ago

The moment I realized I was torquing lug nuts in the wrong pattern for 15 years

I was swapping tires on my F-150 last weekend and noticed the rotor was warped on the front passenger side. Turned out I'd been going clockwise around the wheel instead of the star pattern, and it caused uneven pressure over time. How long did it take you guys to figure out the right sequence?

3 comments

kim_mason55•14d ago

Tried rebuilding a Ford 5.4 Triton timing chain with the engine still in the truck

Got everything lined up perfect on the passenger side but stripped the VCT phaser bolt on the driver side and now I'm wondering if anyone else has tried the crank holding tool from Harbor Freight or if I should just pull the whole engine out.

3 comments

the_felix•17d ago

Just realized that timing belt "rule" cost me a $1,200 repair

Old mechanic named Gary at the NAPA in Tucson told me timing belts are good for 100k miles no matter what. I followed that advice on my 2017 Accord and the belt snapped at 97k. Took out three valves and left me stranded on I-10 last Tuesday. Turns out Honda revised their recommendation to 60k for that engine in hot climates. Anyone else get burned by outdated advice from the old guard?

3 comments

ray562•17d ago

Stripped a bolt on a Mercedes 300D in my driveway last Saturday

I was trying to swap out the glow plugs on my old 1984 300D, you know the ones that are notorious for getting stuck. Fourth one from the back snapped off clean with the threads still in the head, felt like my stomach dropped. Had to borrow my buddy's extractor kit and spent 3 hours drilling it out with a left-hand bit, but I got it out without damaging the head. Has anyone else had luck with those cheap extractor sets from Harbor Freight or is it worth spending the extra money on a real set?

3 comments

shane170•18d ago

Unpopular opinion: I actually like working on rust belt cars

At the shop on Wednesday, this guy from Florida was complaining nonstop about my 2003 Silverado being nothing but trouble. He kept saying everything up north is junk because of the salt. But that truck taught me more about patience and problem solving than any clean southern car ever could. I mean, sure, I spent 6 hours on one lower control arm bolt, but the satisfaction of breaking it free without snapping anything was worth it. Anybody else feel like rusty projects make you a better mechanic, or am I totally off base here?

3 comments

webb.hannah•21d ago

Tried to help a buddy replace his alternator last week and he argued with me for 20 minutes about the belt routing

Guy watched one YouTube video and swore the tensioner went the other way, even after I showed him the diagram on my phone. Anybody else deal with friends who think they know better than someone doing this for 3 years?

3 comments

casey342•21d ago

That time a master tech in Phoenix changed my mind about oil viscosity

I always ran 10w-30 in everything until I talked to a guy at a shop near Chandler who showed me his tear-down data on a 5w-20 engine that still looked new at 200k miles. Has anyone else seen real proof that lighter oil actually protects better in modern engines?

3 comments

gray314•24d ago

Wasted $350 on a ceramic coating kit that failed in 6 months

Bought a DIY ceramic coating kit from an online shop and followed the directions perfectly, but it started peeling off after just 6 months. Anyone else have bad luck with those at-home coating kits?

3 comments

kim_davis•26d ago

Rope access changed my whole approach to engine swaps

I was at a shop in Portland last month helping a buddy pull a V8 from a classic Mustang. We had the car on stands, struggling with the bellhousing bolts for like an hour. One of the old-timers from the shop next door walked over and asked why we weren't just using a rope sling from the ceiling joist. Said he's done it for 20 years never dropped a thing. Felt stupid honestly. We grabbed some climbing rope he had and looped it around the engine then over a beam. Took us 15 minutes to pop that motor out once we had tension right. Now I'm ditching my engine hoist for small block swaps. Anyone else trust rope over a chain or stand for this stuff?

4 comments

garcia.wren•29d ago

Shoutout to the old shop teacher who called me out on my torque wrench habit

Back in 2019 at a community college class in Phoenix, this retired mechanic named Mr. Hendricks saw me just clicking my torque wrench back to zero after a job. He said, "You're gonna ruin that thing, kid, store it at the lowest setting instead." Anyone else have a mentor who taught them a simple habit that saved them money over time?

3 comments

nathan_kim•29d ago

Switched from impact guns to hand tools for dash work and I'm never going back

Spent 10 years using a 3/8 impact on every interior bolt I could reach. Broke three trim panels last month on a 2018 F-150. Senior guy at the shop told me to try using a ratchet and a stubby screwdriver instead. Took me 20 minutes longer on the first one but zero broken clips. Second one was only 10 minutes longer. By the fifth interior job my time was the same as with the impact. And no more trips to the parts counter for replacement panels. Has anyone else found that slowing down on certain jobs actually saves time in the long run?

3 comments

henry_anderson54•29d ago

Old timer told me to always replace the thermostat housing bolts... now I get why

Had a 2012 Focus come in last month with a slow coolant leak. The senior guy at the shop, Jimmy, told me to swap the thermostat housing bolts even if they looked fine. I figured it was just him being overly cautious - why replace something that ain't broke? Well after I put the new housing on with the old bolts, three days later the customer came back with the same leak. Turns out the old bolts were stretched just enough from the heat cycling. Had to pull it all apart again and lost a Saturday morning. So who's actually swapping these bolts as a rule and who's rolling the dice like I did?

3 comments

margaretc42•1mo ago

Vent: lost a job because the harbor freight torque wrench was off by 15 ft-lbs

Was doing a head gasket on a 2002 Civic in my driveway last Thursday and the bolt snapped at 55 ft-lbs, found out later the wrench was clicking at 40, had to tell the guy I couldn't finish the job and now I'm out $300 and a reputation, has anyone else had a cheap tool cost them real work?

3 comments

dylan_ward•1mo ago

Old timer told me to stop using impact guns on oil drain plugs back in 2018

A guy named Ray at the shop I worked at in Detroit kept saying I was gonna strip a pan if I kept zipping drain plugs on with the gun. I laughed it off because it saved me maybe 30 seconds per car. Then last month I had a 2015 F-150 come back with a slow leak. Sure enough I had cracked the aluminum pan around the threads. Had to replace the whole thing. Cost the shop $180 and I felt like a jackass. Anyone else learn a basic lesson the hard way?

3 comments

corap61•1mo ago

Talked to a diesel mechanic at the parts counter who told me I was overthinking my torque wrench calibration

He said he just uses his snap-on digital every 6 months and hasn't had a come back in 20 years, so now I'm wondering if my yearly $150 calibration service is just wasting money, anyone else skip the fancy labs?

3 comments

lee.cora•1mo ago

Talked to an old diesel guy who made me question everything about diagnostic shortcuts

Met a retired fleet mechanic named Frank at a parts counter in Phoenix last Thursday. He said I was wasting time guessing sensors when I should just listen to the engine for 5 minutes before plugging in the scanner. Hit me different because he showed me two jobs where he fixed a no-start just by checking ground connections first... something I never even consider anymore. Anyone else rely too much on the computer and forget the basics?

3 comments

cora_west5•1mo ago

Found a weird trick with brake fluid and rusted bolts

I was working on a 2005 Ford Focus last Tuesday and couldn't get a caliper bracket bolt to budge after soaking it in PB Blaster for 20 minutes. Out of frustration I dripped some DOT 4 brake fluid on it from a nearby bottle and let it sit for about 5 minutes, and the thing came loose with just a breaker bar. Has anyone else had that work or was I just lucky that time?

3 comments

morganl71•1mo ago

Finally figured out why those cheap oil filters keep causing startup knock

After dealing with 3 customer engines that had sludge buildup last month, I took apart a few discount filters and found they don't have the anti-drainback valve that keeps oil from draining into the pan overnight, so when you crank it in the morning all the top end is bone dry until that pump catches up.

3 comments

blake_kelly19•1mo ago

That day in Houston when a 2002 F-150 finally made me quit arguing about torque specs

I spent six years swearing by the book on every bolt, then a buddy showed me his truck that ran fine for 100k miles with hand-tightened valve covers. Took me just one oil leak on a Sunday to realize real-world experience beats the manual sometimes. Anybody else had a factory spec cause more trouble than it solved?

4 comments

robin896•1mo ago

That 1987 F150 I worked on last week had some weird wiring I'd never seen before

I was doing a tune up on an old F150 for a customer near Austin and when I popped the hood, the previous owner had spliced like 8 different aftermarket add-ons into the factory harness. There was a cheap amp, some off brand fog lights, and even a trailer brake controller all tapped into the same 12v line. No fuses, no relays, just twisted wires and electrical tape. I spent 3 hours just tracing and cleaning that mess before I could even touch the motor. Has anyone else run into a total rats nest like that and just wanted to walk away from the whole job?

4 comments