Real Mechanic Reacts to Catastrophic Engine Failures
ฝัง
- เผยแพร่เมื่อ 7 ก.พ. 2025
- We hired real mechanics to break down catastrophic engine failures. Some of these are from user error, some are mechanical failures, and some are just freak accidents. Hopefully you can learn something about what NOT to do when working on your own car.
Huge thanks to our experts: Paul, Sandro & Jacob! Drop some love for them in the comments.
Real Mechanic Stuff is a brand new channel from your pals at Donut. We'll be featuring all kinds of automotive experts every week.
1 subscribe = 50+ hrsprs
2 videos in an hour, you guys work way harder than those chumps at donut.
@@SAMPLETEXT285 joke
@@SAMPLETEXT285 Really??? Who'd have thought 🤔
😂😂
@@SAMPLETEXT285 you rly missed the joke 💀💀💀💀
:D
Sandro is always saying “that’s dope” and I love it😂 like, “shit you blew the head gasket?” - THATS DOPE. “Damn, that guy crashed his car” - THATS DOPE. Thank you Sandro ❤😂
its cause hes a one trick pony, like this entire channel is.
The same in the "would you ride or not be caught dead in it?" video. Dude's chill with anything
@@Starkillr1 "why wont this car channel talk about stuff besides cars" 💀
@@Starkillr1why did you leave so many angry comments on their channel lmao what’s your problem
@@obesepersonEnvy.
Sandro and Jeremiah are a great duo...keep bringing him back. Hes got a chill laid back sense of humor
Dude 1000000% my thoughts. Make them a regular duo!
yes! I need them hosting other things!
yea if youre 3 years old and have nothing to do all day but watch two man babies try to seem relevant.
I know it sucks Jeremiah left donut media is changing a lot
yeah love how they canned all the white people for obvious affirmative action hires. sandro may be funny but i'd never trust him within 20 feet of my car. no clue which one jeremiah even is.
I love the chill mechanic who's just like "let it evaporate bro".
He's a dopey lookin prick hey lol :p
In case anyone was wondering that semi that lost its engine during the pull was probably pushing close to 130-140 psi on triple turbos. The pullers go hard
Yeah, he said 60 pounds and I was thinking, "Nah, that's over 100 pounds at LEAST."
You meant it was pushing 8,93 to 9,6 bar
Yeah, my 3rd gen dodge hits 60psi at Wot with a single fleece cheetah
And motor mounts didn't break, he split the block
Well at least he doesn’t have to take out the engine. Simple in-frame and it should be good as new……..not.
Sandro is the most mechanic looking mechanic EVER
If I walk into a shop and a dude that looks like him is in there I’m going to intrinsically trust them fr
@@matthewlucas4142 as long as you don’t trust shops that have had the same cars sitting outside for 3 years or have a consistently crappy looking shop, you will be good
Jeremiah and Sandro are the best duo without them even knowing it.
Sandra looks like a stupid Mexican gangbanger sussy baka
on god
Yeah they were a really chill duo. They seemed focused on getting the videos over than themselves.
I could just watch sandro tear stupid car guys up all day.
Sandro seems like such a cool guy to hang out in the shop with. Encyclopedic knowledge and funny and witty. 🙂
For those that don't know, the truck that launched it's engine out wasn't broken motor mounts. Pullers like that have strengthened everything in the engine to the point the block itself is now the weakest point. That truck blew the top half of the block, head and all, right out of the truck. You can see in a different picture of the truck after that the crank and pistons were in it and the cylinders were in the part that launched out.
Yep, in the divisions that dont allow billet blocks you will often see the blocks split in half all the way around at the freeze plugs.
"the internet thought we were bad at working on subarus" hilarious
lowkey? revving an oilless boxer that long just makes me feel better about mine
@@baelm mine too. 156000 miles. 2008 wrx
@@chrisS19019 i have a 205 with about 25k or so on the rebuild, has a rattle so seems like they put in stock size pistons on an old block where they should have honed the bores and oversized the pistons
yall are really gentle on them subies. Donut actually drove them like the rest of us.
@@nicki8731 i beat the piss out of mine just about every drive
Sandro never fails to make me laugh. Seems like such a chill dude
100%
Dude found his calling, plain and simple
Little know fact here, in order to complete a true, 100% percent oil change, you can't just drain the oil and replace it. That leaves all the old oil on the interior parts.... to make sure all used oil is gone, it's common practice to leave the pan off and bang the rev limiter for at least 3 minutes to burn off the used oil. Pro shops dont want you to know this performance technique.
💀
No
Why not just put the engine in the microwave for 5 min, the old oil will boil away
Yeah no I'm not putting my iphone in a microwave to charge it billy, no matter how much you try and convince me.
@@jonf2009 Smart, considering that hack only works on Samsung phones
thanks for explaining what happened to my childhood school bus that one time. She was an old girl that broke down a lot, we had to cross on a ferry to get to school and one day when the driver was warming her up, he stood outside to talk to a parent and the bus started just revving and it got pretty high pitched. Never saw that driver run before or since. now i know why
Someone Tell me if im wrong but the explanation of them saying its Diesel vapours that get sucked in is wrong. Whats its actually caused by is if you have a turbo that is worn out and starts sucking in the oil thats keeping it lubed up the engine Starts running on its own oil that the turbo is shoving in there hence why you cant Just Turn it of couse the engine isnt running on fuel anymore at that point its running on its own oil.
Hey, um.....I think your bus driver left you to die.
@@merlin_gt4472 You are correct, they are not.
Runaway diesels usually are a matter of an internal oil leak, the diesel will start to burn the oil as fuel even after you cut the fuel injectors off.
Can be from explosive gasses in the air too. On the oil and gas sites here in Canada you have to have runaway prevention device on all Diesel engines on site. If there is a slight natural gas leak it can cause the engines to runaway. I have even seen a propane station leak cause a runaway on a truck.
@Backmarker Racing oh wow, down here in Texas we don't have to have any prevention devices. Oil plants, refineries, even natural gas power plants, this was the first I've heard of that. I wonder if the climate here has anything to do with different regulations?
its either a failure within sending oil into the cylinder or, more commonly, when it is overfilled with oil or from driving (short) distances when the engine oil gets diluted with diesel resulting in a higher than max oil level. it wil push oil past the piston rings into the cylinder and take off to max rpm (usually 5500-6500, diesel wont burn faster than that)
@@JayFredTheFreshest the worst refinery accident in texas happened due to a runaway diesel, texas city refinery explosion 2005
@@markzenhorst5259 turbo oil seal can also feed oil in
The run away diesel was a constant risk when I worked in the oil patch. All trucks and equipment were required to have positive air shut-off systems incase of a gas leak. Crazy stuff.
I've seen the NTSB video where a runaway diesel engine set off a massive explosion, so that safety feature makes perfect sense to me.
@Kumquat_Lord I watched that too haha. CSB makes great videos
@@Kumquat_Lord Yeah, unfortunately in one I recall him flipping the positive air shutoff caused a backfire or something like that and ignited the vapors. He should've just run because there was nothing he could do.
Anything diesel should have that i think.
@@BazzaroPlays who did you work for? Haliburton? When I was in the oil patch, my “positive air cutoff” was unlatching the hood when I got out to hook up the hose and leaving the bands on my turbo intake loose and keeping a little bucket with some weather stripping around the lip handy to stick over the turbo inlet…. I DID forget to latch my hood back a couple of times and got a surprise when I hit my brakes after getting loaded and leaving the well site
I'm so happy y'all made this video format into its own channel.
Me too
10:15 i can tell you what happens, i had an 88 subaru GL wagon with a major oil leak as a kid. I was getting rid of it at the annual free car dump so i let it go dry, infact it was so dry the dip stick was orange with rust. I drove it DAILY for 3 months on rust instead of oil and ended up selling it for $500 cause it just wouldnt breakdown or seize. It refused to die.
Getting the water out of the engine at 15:00 was so cool to see the firing order or the engine.
6:40 diesels runaway because they’re compression ignition and often run a high pressure mechanical fuel pump AND volume pump. The faster the engine turns, the faster the pressure pump turns. If the throttle plate sticks open (engines are pumps and are pulling a vacuum) mechanical pump is gonna pulled more fuel (and you can run on just a pressure pump I believe VW did it in the late 90s at least), timing is there. So you got stoicheometry and she goes. Slam a board over the intake to starve it for air or cut a fuel line underneath; flaring a fuel line and putting in a union is cheap versus a motor.
Sandro is one of my favorite guests.
Werez Angelina dat my fav ❤
12:16 I've seen that on a friends car a few years ago. Difference was, that he didnt add water, but used his car on everyday basis for a ~1 mile trip to work, so the engine never got to temperature. Result: condensed water accumulated in the oil pan, finally froze during winter and the engines last words were "wroo...blubb".
This is going to be my favorite channel, don't tell those guys at donut media 👀
Before i saw your comment i just figured it was the donut main channel
@@JaredConnell lol same
dude this channel came out because these vids isn't similar to want the other donut vids are like but people like these vids so they lauched this channel
if anyone is old enough to remember when ABC used to do the wide world of sports back in the day, you use to see some of the old top fuel dragsters blow the top end off their motors at times. was always spectacular to watch!
Runaway diesels are no joke, i have a big diesel engine from the 60s for industrial equipment that does it sometimes and its one of the scariest things i have dealt with.
Great upload
Youre saying it like its a common ocurrence😳
At that point your only choice is to throw it in neutral and say goodbye to your engine.
@@ChefofWar33 I mean that guy knew his engine well. He choked it of air long before it ran too much. Quick thinking on his part.
Just found your page...as a retired mechanic I LOVE IT ❤️
So happy to be subscribed to such a small, humble channel.
I hope this is a Joke since it's a second channel to one of the Biggest Car TH-cam Channels on TH-cam
@@deltasixgaming i swear to god there needs to be an adult version of the internet because of people like you
@@clipsedrag13 hey hey chill out, he’s a gamer
@@deltasixgaming wooooooooooooooooooooooooooooooooooooooooooooooooooosh
@@deltasixgaming Is it really ? i just thought these guys really like donuts...
When I was in auto/diesel school, we had a diesel engine runaway during class on an engine stand. The instructor told everyone to back away, and jumped in with a clipboard to suffocate it. It worked, and it was scary to see and hear that thing going faster and faster by itself.
Was kinda cool to be there, since everything ended alright
So glad you guys found a way to bring us more fun with these mechanics. I love you old bald dude and I promise I'll learn your name
That IS his legal birth name.
Paul
Just imagine a shirt for Sandro saying
I see you did it for the boys.
With a blown engine while he's next to the shot out connecting rod.
😂
FOR THE BOYS!
7:44 The most accurate thing said this video.
13:27 Reminds me of a time after a hurricane. My mom and I were debating on getting groceries while in town. The store's parking lot could only be accessed by two long driveways, the grocery store being behind another business, both driveways flooded. We waited for a while, debating on attempting the drive. Then we saw a Pepsi/Coke truck (I forget which) start to drive out. When it hit that water, it made a pretty good impression of a snowplow. Needless to say, we said, "Nope!" That was just too much water!
Most runaway deseils happen when you have an oil leak somewhere. Usually in the turbo and it uses the oil as fuel and will not stop
It's hilarious that whenever you see those flood videos, the water is shallow enough that maybe you could get through if you go slow, but people attack it so fast that it creates a massive wave over the front of the car that floods the engine.
The one shown here is a famous ford in England, they recently closed it from all the knob-heads doing this to their cars.
Yeah, those trucks normally have their air intake mounted fairly high, if they had just gone in slow they most likely would have been fine.
@@SimonJ57 And obviously those in the know when the ford is flooded and all fire up the old cameras.
Can we get a broken piston rod shirt with “What’s cracking?” on it? 😂 3:00
well my motor can do those rpms no problem but then again she's electric and does not have rods to break so yeah she's built for higher rpms then that she'd be fine the tranny probably not but oh well that's why my cars has a single speed reduction drive tranny to take that power🤣🤣🤣
the fact you got that ford crossing video in there is hilarious, i drive past this place most days for work. interesting backstory is this place got really popular for people smashing through it and for people videoing it so things kept getting more and more insane until eventually the police closed the road, i think its been closed for a good six months so far.
Like that curve on Nürburg Ring.
Makes me happy to see a clip from the UK in this video at 13.10. Rufford Ford, for anyone who doesn't already know. It's actually closed now because the locals complained as so many people would just hack it through and end up blocking the road when their car bit the dust
There's a few channels here filming the idiots who drive through it.
Good to hear it's finally closed.
@@thecatofnineswords Nuts thing is the diversion was like 4 miles and people decide to still drive through it.
Saw an R32 die there :(
I was a passenger in almost the same situation as the flood video, so i can say with experience that the driver was trying to get to his local "Game Crazy" to buy NHL 2012. We all told him it was a bad idea, but he was dangerously Canadian.
I think the more common cause for run away diesel is a busted oil seal in the turbo leaking into the intake side. There are industrial scenarios where diesel engines have to be outfitted with emergency shut off valves due to excessive flammable gasses in the air that may occur at a fuel refinery or gas processing plant. You can still find some older diesels in use that have manual shut off valves in case of a run away event.
Love the new channel guys! And thanks for the runaway diesel info. Been a tech for 6 years and never heard of that before.
Bruh, this is awesome! I've loved Paul and Sandro every time they've been on Donut, I can't get enough! Can't wait to see more content from this project!
Couple of thing to unpack here:
1) You guys literally have the best job in the world!
2) How tf did that subie run full throttle with no oil pan for so long when your subie clapped out going around a corner with a sump full of oil (no baffles, blah blah blah, i know).
Great vid. Keep it up.
👀
Did you know you are the first comment
This an unofficial channel or what
@@captainsupermaket8003 it's official
Detroits are notorious for running away. We used to keep a board nearby to hold over the turbos.
Ohh yeah, this 100% deserves it's own channel. Can't wait for the content you guys pump out here. You guys find some of the coolest mechanics out there.
watching these to educate myself. remembering the times I fumbled the knob and switched from 4th to 2nd gear. maybe... twice in 6 years? I love my Nissan Pixo. He's a good boy. Never has had any trouble, but I also have him checked regularly.
16:35. Great point, Zac. If you're working on your vehicle disconnect the battery and use chock blocks and jack Stands. 😁👍
I'd modifyit just a bit;If you're ever working on a vehicle make sure to have a fire extinguisher nearby. I have two 30 lbs extinguishers in opposite ends of my garage and a small one in the trunk of my cars.
Haven't had to use one yet but i have friends who wished they had a small one,otherwise by the time you get help you've lost alot of money.
@@BMWe-ed2tn you assume one has a shop. 😕 I'm just talkin' "roadside".
@@leegoddard2618 When I said garage I really meant a garage, give I can fit 2cars in mine I still fear a fire in the opposite end.
Even roadside you should have a small 5lbs extinguisher , it’s a cheap 20bucks insurance against a total loss :)
But yeah jackstands and chicks can mean life or death(not saying a fire can’t)
@@BMWe-ed2tn no, you're right, having one (fire extinguisher) in the vehicle is good. 😁👍
but he turned his car into a piece of trash so now you know what not to do to make your car a piece of trash kids learn from his mistake😁👍
Loved seeing a fail moment from Concept3 in this video lawl. Watching their "Customer States", the shop boys and Will Chang's bilingual cursing is so entertaining by itself 😂
I learned the hard way that you shouldn't downshift to second gear on the exit at 70 mile/h. Just bent my valves luckily and fixed the engine myself for $600. Even has better compression now!
I love how Sandro is always so cool calm and collected like nothing startles this guy. Its always for the Boyz!!!
that's nice to have a different channel for this stuff, love it and please keep it going.
Angelina and Sandro total win. Love the new channel guys. These videos are FUN.
9:07 My emotions went like:
Oh no! Not the rotary Rx7!
*after realizing:*
Oh, it's a swap. ugh They deserved it, but not the car that was swapped.
You ruin the rotaty/pop up headlights - you get what you deserve.
10:27 my favorite Impreza of all time! Why did they do this. You could have at least replaced the engine and now you have a big clean-up in the engine bay to fix. I wish we got that model is a WRX but we didn't that's obviously a 2.5 RS.
Sandro needs a full time spot at donut!
14:30
That road is always flooded a little, and there's tons of videos of cars making it through. On that day it was just under high water.
People DID mess up so often that the road was shut down earlier this year.
Sandro and jerry together are classic gold
The first video is why I love my 1967 ss427 4spd convertible impala , long story short my dad bought it new ss427 390hp , he blew it up in 69 and ordered a replacement 427 l-88 , in 1996 I bought from dad for 10,000$ 😊 for miles , my big black imp is my Dailey driver , I get 8,900 rpm reliably it won’t rev any higher ……… such a sweetie of a beast 😊😊😊😊
I'm amazed how long they were able to rev that car with out an oil pan.
Tank´s for stopping the shouting!
Now, You got back, one of Your European followers.
I am able to follow a good show, without getting pissed of by the noise.
Con grats for 7 mil+ followers, now I am one of them, again.
from a Finn in Diaspora
I feel like this is the beginning of a beautiful relationship
Sandro's probably my favorite dude of them all.
I love how the guy recording the subby kept stepping back LOL
I wish i knew a mechanic like one of you guys.
Super intelligent & experienced mechanics on this channel👍
Real mechanic stuff is actually a cool idea 😮
Hopefully we get more Real Mechanic Stuff
3:10 hard cut rev limiters sound great, but they are way harder on parts than soft cut. The rapid speed up and slow down causes unnecessary harmonics and vibrations that weaken the rotating assembly
Netflix: are you still watching?
Someone’s daughter: 6:52
😂😂😂😂😂 doooood!! That joke goes hard.
1:26 that ad placement was killer...made me laugh!
EJECTO SEATO CUZ! 2:33 can we get this on a shirt please!
I LOLled so hard when Sandro said "what are we doing?".. philosophizing about engine destruction, and the rights of engines..
lesser known fact - when in doubt, choke it out - this does NOT apply to your girlfriends.
I am no mechanic but at 3:47 I knew in instance that something was not right. When even on straight line a front wheel is lifted up like that while the other isn't, then something is obviously wrong.
8:32 those 2-stroke Detroit Diesel engines are know for running away
Bruh Sandro saying “that’s dope” when he sees the rod on the ground in front of the car is the best idc😂 spirit animal
You can prevent money shifting by beefing up your drivedrain mounts and shift bushings. A lot of times this happens because under load your shifter will be in a diferent place then when you lift off, so people miss the gate by accedent going from 4th to 5th,
The runaway diesel thing sounds a lot like how crew served weapons can start cooking off rounds and then "run away"
Tractor Pulls are awesome
Can we also appreciate the editing mixed in with Justin’s comedic timing? 😂😂
2:31 "Ejecto seato cuz!" 😂 Tyrese in 2Fast 2Furious is hilarious 😂 RIP Paul 🙏
9:18 the camshaft just said "Woah the outside world is pretty"
At 7:57 that runaway was from the fuel rail (basically the throttle for a diesel) got jammed WOT. So its not like it was struggeling on some busted oil seal......It went WOT and stayed there 😂
@8:40 'when in doubt, choke it out'... That's what she said
4:19 what here happen was the engine torsion bar broke because of the extreme torque of the engine that was keeping the engine in the truck but without that the engine can now rotate more as designed for so the only way was through the hood on the ground.
This makes me feel so much better about the time put a bit of water in my Powersteering Fluid thinking it was water.
The runaway is actually fun, I've seen a few in my career (truck and transport diesel mechanic) sometimes they will run away on their own oil, and can't be stopped. The guy who blocked off the turbo did 1 of very few options to stop them, I can choke them out, put manuals in highest gear and SLOWLY release clutch, blast them with a CO2 fire extinguisher (most fuel trucks have valves in them to be shut by driver in the event if a runaway)
I don’t know why I’m here but I’m happy, don’t tell 🍩 lol
After I broke two spark plugs in my cylinders, I never touched spark plugs ever again.
I can only imagine that any tuning setup that would allow you to rev your engine to 9000rpms would also allow you to place a rev limiter anywhere you please. RIP little D.
5:52 the trailer thing says 'terminator' lol
Facebook marketplace engine runs well used lightly 10:52
Why am I just now finding this channel?? Rock on guys, y'all kick ass!!
The tractor pulls, those motors are pushing close to around 5000 ft lbs of torque, or just shy of it. It’s absolutely insane. I mean their boost i think is around 150 lbs or more
200 plus.
@@toodamnmanyprojects7094 yeah i know the shit is high and extraordinary to see what people can really do with turbo diesels
5:41 looking like a Twisted Metal Competitor 😂
You guys should do an episode on performance diesels. 200+ psi of boost running down a 1/8 mile hits different
Mother of God, now that's boosted
7:02 they fail to mention most run-away diesel situations are usually caused by the turbo feeding the cylinders with atomized oil form a bad oil seal within the turbo and not typically a fuel leak.
The pulling truck that blew an engine was probably pushing over 2,000 hp. Insane power
Yeah I'd say that 60 psi was a low ball I got friends that street 60 on their street trucks probably overly 100 psi
@@Nahthataintmeimaboss This! Heck my BMW X5 diesel that's deleted and tuned runs 50psi.
@@Nahthataintmeimaboss I was thinking this as well. My severely detuned 579 pushes about 30psi, my previous detuned Cascadia was around 40psi at max. They're running like half power at those boost levels because of the detune. I also venture to say that it's more than 25 tons (on the first one at least) considering trailer + freight is regularly around 30 tons for an average, detuned semi tractor.
It's got so much torque that the whole frame was twisting! Insane
Engine wanted to be at the full pull line.
1:58 To prevent that (ignoring skills) you could put in a old school "fishbone" plate, like in old supercars. It's a easy and cheap way to do it + that plate and "bare metal" stick, looks awesome!
wouldn't do shit to my motor she already goes above 13k rpm already so the motor wouldn't care she'd be like meh I'm fine baby
10:17 As a Subaru owner...
Crazy to see Rufford Ford in one of your videos, that’s just up the road from me 🤯 big love!
subbed before 50 subs, commenting for proof ! !
A high school mate of mine experienced a diesel runaway in his Skoda Octavia 1.9TDi. The scariest 15 minutes of his life and the reason he never ever again bought an automatic transmission car. Fortunately we were at the local airstrip and while he was unable to shift the car in neutral or park, he managed to lock it in 1st gear and circle around the strip for 15 minutes, till the engine burnt all of its oil and overheated to a stop. The beauty of diesel engines being able to run even w/o diesel.
Money shifting as a kid: “I’m going to slam the imaginary stick down in my cardboard box car, speed up, and win the race like the hero I am!”
Money shifting as an adult: “…I’m never going to financially recover from this.”