Here's What I Think of Engine Blow-By in 1 Minute

Engine blow-by. Here's What I Think of Engine Blow-By in 1 Minute, FYI with Scotty Kilmer. What is engine blowby? How to test for engine blowby. How to check for worn piston rings. How to test engine compression. Does blow-by cause engine damage? Engine piston rings and blowby explained. 1 minute tips. 1 minute car advice. This was an excerpt from one of my Live Car Talk shows where I answer your car questions Live. DIY car repair with Scotty Kilmer, an auto mechanic for the last 50 years.

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Related Video: How to Tell if Your Engine is Bad (Compression Testing):

Engine Compression Tester:

⬇️Things used in this video:
1. Common Sense

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This is the people's automotive channel! Learn how to fix your car and how it works. Get a chance to show off your own car on Sundays. Or show off your own car mod on Wednesdays. Tool giveaways every Monday to help you with your own car projects. Or enter your own car to compete in the Car vs Car contest every Thursday. We have a new video every day! I've been an auto mechanic for the past 50 years and I'm here to share my knowledge with you.

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⬇️Scotty’s Top DIY Tools:


➡Related Video: How to Tell if Your Engine is Bad (Compression Testing):

🔧Engine Compression Tester:

🛠Check out my Garage to see what I use every day and highly recommend:


Scotty on Social:

This was an excerpt from one of my Live Car Talk shows where I answer your car questions Live. If you enjoyed it, every Thursday at 1 pm CST and Saturday 10 am CST I live stream and answer your questions!

[heavyweight]

Every engine has got "blow by". Its not possible to seal the cylinder with the piston 100 percent. There's always a tiny amount of blow by but depending on your piston rings. Right, if they are worn the will have a higher rate of blow by.

[superaslan]

A trick I've seen is to hold a glove over the oil fill as the engine is running. If the engine has a lot of crank case pressure, either from blow-by or a bad pcv sys, it'll blow up the glove. If it doesn't, or there's even a little suction, then the crankcase is vented well.

[frederickw]

Engines have a little blow by. as they get older they get worse. This is what helps turn the oil black. I bought a jeep that looked like a steam locomotive when I removed the oil cap. But it ran strong, and no smoke out of the tailpipe.. It's still going a year later. damn thing won't die. 30 years ago I had a Vaga did the same thing. It died shortly after I got it. :)

[cesarsilva]

Hey Scotty been following your channel for a long time
You have good informative video..
Thank you for taking the time to help out the average person 👍👍

[timingisperfect]

Excellent new format Scotty - no way I can skip my 60 seconds of "car church" over lunch =)

[Michael-fwef]

Yes, I love this new format. You take a question from your Google Car Talk Segment, you explain the mechanics behind your answer and you eduate all of us in about 1 to 2 minutes. Please keep it up Scotty. Excellent.

[KingOath]

Some diesel car engines can have fairly heavy blowby as normal, on these engines it doesn’t neccesarily mean there is a problem with the engine

[kazj]

Scotty, love your channel, you remind me of my dad (mechanically gifted electrical engineer who explained everything to me, from epoxy to Fourier transforms!) Could you do a video on the ZF transmission in the 2016-2018 Honda Pilot? People seem to have issues with it but I just got an '18 Pilot and it drives just fine (hope I didn't speak too soon). Thanks!

[sawajiri]

Scotty Kilmer the best Mechanic i ever seen in YouTube. Scotty is direct to the point when he explained that's why i like it 👍👍👍more thumbs up and subscribe to you

[kennedyjimenez]

Rev up your engines! Daddy Kilmer has uploaded 😤😤😤

[bernieg]

Pull the oil cap with the engine running, if air, oil & smoke come blowing out. Its no good

[iliaslamari]

Check also for smoke coming out of the exhaust. If you see black/blue smoke when the car is running. Than it's burning oil. Could be the piston rings.

[wolvenar]

In my opinion leak down tests work better to test blowby, but either will give some sort of idea.

[TimZ]

Take the oil filler cap off while its running or the dip stick. If smoke and a lot of air is pumping out you got yourself a craigslist Gem right there. LOL

[jjjsmith]

Legend has it that Scotty just had a brand new kitchen sink installed in the Celica:)

[johnwilson-]

The way to test if its blow by or just normal vacuum, is by putting a plastic bag over the opened oil cap, if the bag fills like a balloon, its blowby, ifit fills a little then stops, its normal internal Vacuum...

[TheLionAndTheLamb]

A really quick and easy way is to remove the oil cap while running and feel for excessive crankcase pressure. It's by no means the best way though.

[JisINSANE]

best way to tell is taking the oil fill cap off and feeling how much air is blowing back out and vapor.

[gtaashwagandhaman]

I'm surprised that you didn't bring up taking off the oil cap while the cars running... Thats the Ultimate way to check, my girlfriends 2000 nissan sentra even only at idle oil was spitting out, Scary