132 Comments

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Joshua Ryel
Schertz, TX · 14 days ago

Not only do mechanics do this but technicians do this also that work on multiple machines

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Dean Coe
East Point, GA · a day ago

yea😁

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Jeffrey Firebaugh
Roanoke, VA · 18 days ago

torque mark. let's quality control inspectors know those bolts were torqued.

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William Lions
Clear Spring, MD · 3 months ago

Is this a joke???

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ProfessorPlumb
Mexico, NY · 3 months ago

comment picture
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John Hamm
3 months ago

The dipstick mark??? The creator is a dip.

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Donnie Horne
New York City, NY · 3 months ago

I was an airplane mechanic for 12 yrs..After we ran out of the paint pen I just started using fingernail polish.

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Mike Hammer
Groton, CT · 3 months ago

using dye marker on a drain plug on cars I worked on saved my ass at vehicle service center when a customer tried to scam us by saying we didnt add oil during a oil change that they wanted a new engine. engine was inspected on a lift and my dye marker was broken. the company declined any repairs and told the customer to pound sand.

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Jeff Dean
Princeton, MN · 3 months ago

There is already a timing mark on the gear

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Nathingtwo
Odessa, TX · 3 months ago

Why the marks on top of the valve springs??

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matthew vaughn
Lemoore, CA · 3 months ago

Impact Wrench ...

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Dee Larson
3 months ago

I’m not a mechanic, and I know this. I’ve caught many lyin’, thievin’, mechanics this way, too.

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Guest
3 months ago

I'm an electronic tech and repair my own car(s), and I knew this.

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rob hansen
Port Angeles, WA · 3 months ago

it looks like it's a tooth out of time now

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Robert Whitney
Fort Worth, TX · 3 months ago

setting the timing chain

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pothead_nation_420
Pocahontas, TN · 3 months ago

What being annoying

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Rudy Justice
3 months ago

Wow, I would just finish painting all of the part, looks si cute

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Patriots Cheat
Blue Springs, MO · 3 months ago

They are called inspection marks. Gm has been using them since atleast the 50's. I restore old corvettes for a living, mostly C1's. My 2024 Silverado has the same marks, same colors, in same places as a 58' corvette. There are more marks now, a few more colors, in places the truck has the car doesn't.

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Flames
Willis, TX · 3 months ago

Lies gun owners know it too...

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Sean Crum
Lakeside, MT · 3 months ago

yep making sure nobody messes with your work behind you and when they do you know... always follow up with a photograph so that you can authenticate your marks.

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Dave Lewis
Houston, TX · 3 months ago

when you are out of loc tite fingernail polish works as well too.

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Boliver Diaz
Kissimmee, FL · 3 months ago

Trade schools would include this, among other learning tips.

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Michael Resnik
Fair Oaks, CA · 3 months ago

not seeing a corresponding timing mark on the other gear . why would you mark it here?

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Donnae Sanders
Charlotte, NC · 3 months ago

matchmarking... for remembering the original position

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Jefferey Gutowski
Portville, NY · 3 months ago

seen it done and adopted the process as well

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Todd Tyson
Morrison, CO · 3 months ago

Only a mechanic knows? That's a ridiculous statement.

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Imjustthedeliverydriver
Brooklyn, NY · 2 months ago

That's for reference. So if it goes bad or something happens, they know they were the last one who touched it. So, if you go somewhere else and that mark is smudged, they know you're lying. You're welcome. 👍

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kowboy h.
Denton, TX · 3 months ago

good teachings... this can also be used in hidden places to see if the mechanical is actually doing what they say...

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4Cams&gone!
Kendallville, IN · 3 months ago

if you think its a timing mark, then give up mechanics!

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Jesse Mendoza
Wilkes-Barre, PA · 3 months ago

I'll say dont know how to use Loctite 😆

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Anthony Bryant
Colorado Springs, CO · 3 months ago

been doing this for years, after you torque the bolts. indicates you torqued the bolt to spec, and if anyone after you messed with it!

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Capt. Insano
Visalia, CA · 3 months ago

Pipefitters know this too

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Metatrons Finest
Candler, NC · 3 months ago

it's also a good way to see if someone is messing with your car first tape then glue

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Eric m
Sheffield, PA · 3 months ago

2171 in the Marine Corps. We kept nail polish in our toolbox for the same reason

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Eric Hultman
Spring Lake, MI · 2 months ago

Why not just use a sharpie. Finer point, better line and cleans off with denatured alcohol.

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James Rodgers
Orlando, FL · 2 months ago

you like nail polish alot,hahaha

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bwerta101
Los Angeles, CA · 3 months ago

slip marks

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Steve S
Veneta, OR · 3 months ago

timing off by one tooth...

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Tom Weber
Carson City, NV · 2 months ago

the marks are to tell a mechanic if somebody's been there before, and messing around with things!

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Moderator
SeaTac, WA · 3 months ago

what, how to apply finger nail polish to metal? riiigghhhttt....

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Matt Sims
Sedalia, MO · 2 months ago

mechanics aren't the only people that use witness marks

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Darryl
Vancouver, WA · 3 months ago

I have used puffy paint as my quality control checklist

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Brice Siders
Indianapolis, IN · 2 months ago

its to show if its been tampered with

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Steven
Belton, TX · 2 months ago

WTF is a valve spring retainer?

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Mymommasuxbbc
3 months ago

So you are a mechanic, morgan?

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GunFun111
Visalia, CA · 2 months ago

My name is Mark…

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clemkadiddlehopper
Winston-Salem, NC · 2 months ago

marking timing

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Donnie Grey Phillips
Yadkinville, NC · 2 months ago

It Works

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fatigued1
Camp Hill, PA · 3 months ago

Just paint lines to make it look like they torqued it.