What is Engine Blow By??? 

Dude that first part of your video when you were testing the engine compression was very interesting especially to a disabled auto mechanic like me. I wanted to see what you were going to do next with this motor then boom we were swimming with the fishes? I would have loved to see you remedy this compression loss with this engine. Thank you for the video.

@12:15 are you kidding me, that wasn't boring at all. I was learning so much and comparing my results to yours with your wealth of knowledge. Definitely subscribing

Dude you are f-ing hilarious, and extremely knowledgeable! I love your vids! Thanks for spending the time to make them

Very informative. I especially like the "too much information"

Very educational video. Thank you for being direct and to the point!

I can't believe today is the first time I've come across your channel. Definitely subscribing!

The cylinders that fire together are known as “sister cylinders”

you are great maan.. amazing explanation on how to find out a blowby and which c- chamber it is ... just amazing

In my truck, I installed an oil catch can to prevent oil particles caused by blow by to go through the intake system and gum up everything. Its crazy the amount of oil that that thing collects!

The test you did is great in telling the condition of a Diesel engine.

nice video here. where can I find your fancy relay? really convenient. I need to run a compression test on 2 vehicles but can not seem to find a helper to crank the vehicle. At first, I did it all by myself but then realised that the progression of the reading is also important for diagnostic purpose

Great video, and awesome diving footage at the end. Thank you for sharing with us.

brian = I thought the same... since humidity can go into the engine while sitting...due to hanging open hose can cause maybe corrosion inside.I drove the car like that with hanging crankcase hose for the whole summer since I did not realized it was off.Today I connected it back the way it suppose to be.

never heard of that before. Great vid. Brian, from another vid I saw here, when cilinder had bad comp I think that the outer ones are prone to have poor reading compared to the center ones. Is that right. If so, what is the reason ?. On my prev car always got oily spark plug in number one ... it was so gunk that the cilinder wont fire at all. Cheers

My Toyota Tacoma has 291,000 miles, and has no blow by. Also i done the plugs back in January, and they all looked really good, no oil on them at all. I have the 5vz-fe engine in my truck.

Hey Brian, thanks for this video and the explanations all along the way. I have an '07 Mazda 3 with about 150 000 Km on it and basically the same problem, black on the end of the exhaust all the time, oil consumption way too high ( 1/2 litre per 130 Km) . What would you recommend for a rebuild on this engine?

where did u get that relay with the switch

Hi Brian, What is your opinion on digital compression tester? Worth buying? Thank you.

love your videos dude! scuba is a lot of fun. hope it was a great trip. cheers. keep up those vids man. Us diyers sure appreciate them.

did you check the PCV system before the compression test? I have some blow-by on my diesel Astra and mine pours oil through a lor of seals (dosen't burn oil or any funny noise, just did 300km with it on freeway without need to top up with oil). Heard of you don't replace the pcv filter every 100 000km, it clogs up and causes clow-by to build up (mine builds up only in the rocker cover, nothing comes through the dipstick) and force oil throught the seals.

i love long videos from you brian

Thanks! That's how you diagnose, but how do you fix it?

Great video Brian

Great vid Brian. I really enjoyed the dive footage. Post some more of your adventures on your other channel.

Thank you Brian

Got a 97 OBW. Steady stream of air coming out of the capless oil filler tube. A friend says the timing may be off. I believe that's true. Regardless, Justin Stob at AWD in Oregon blogged about an overheated block can crack a cylinder lining. Any way to test for a cracked lining vs. worn ring without taking head off? (Obviously my engine overheated due to HG failure as explained in a few of your videos).

nice tips...ty for sharing....awesome ending

So if I have an oil leak coming from my air intake is that a symptom of blow by?

hey Brian firing order 1342 i would start using transducers for compression checks and delta FLS type sensors for piston ring blow by by installing on dipstick waste spark firing on exhaust stroke is not for emissions it closes the loop of the ignition circuit i know i sound like a back seat driver you are a GREAT tech all the best to you bro

Question? How do I get rid of blow by? I thought I had a cracked head because oil is getting into my coolant, but my neighbor read my compression sheet, & said I have too strong of compression for it to be a cracked head or head gasket. He is a master mechanic, so I believe him. I was willing to pay him to fix the head or head gasket, & he doesn't turn down money, but he is pretty honest with me, for the most part. He came to the conclusion that it's blow by. Drives me crazy, cuz it smokes, & my new radiator changes from fresh looking coolant to brown oily looking coolant, after driving. Any suggestion on getting rid of blow by? I have a 1990 Ford F-150. Thanks in advance.

nice one brian , luv your vids ..

brian great vid but where did you take the scuba footage awesome! Brian (also) from Ireland

My tissue flew into the engine, lol just kidding.

blow by can actually push oil out all the seals like the valve cover front and rear seals.

Great video ! You rock brian.

Brian I bought a used engine,I flipped it over to gain access to the crank. Had it like that for a few weeks with the old oil filter hooked up. When I went to start it,she had a massive amount of blow by. It's slowly going away, and it looks like steam , there's NO oil indication in my air cleaner. I pulled plugs and a few of them were oil soaked ,after changing them the oil disappeared.What the hell, is it blow by or not .

Hey Brian . A engine that have blow by is bad? My 2005 Durango 3.7L is burning oil with 130,000 miles. thanks

hey brian, can you do a video on undercoating. I'm not sure where to apply it. thanks

My Astra H has sprayed oil all over from the top of the dipstick tube (pushing the dipstick up), now I'm getting brown oil in the top of the coolant tank and my coolant's low even after just being refilled. Is this blow-by? Or is it even worse? Of course it's worse, but is the clean-oil-in-coolant due to over-pressure in the crank-case busting the oil-pump gasket? Or is my engine dumping coolant into the oil, blowing oil out as it boils?

Awesome Video! Ase A1 Test prep stuff man! 👍🏾

Thanks a lot Brian your videos are the best on youtube!

Awesome video, learned something, new sub!

700 miles to burn off all the oil? He arrive on a blue cloud?

Crazy .how can we hear your explanation about blow by when the engine is running and you explain at the same time

is it healthy to have a small amount of air coming out of the oil cap?

Pardon me but did i hear you said that the firing order of this four-cylinder engine is 1-4-3-2, instead of 1-3-4-2?

How 2 coils can fire at the same time when 2and 3 and 1 and 4 are at the top one is in compression and the other is escaping

How would you test on a duramax LB7 that has blow by piston rings or injectors

GREAT VIDEO MAN! appreciate this!

will blow by cause oil in the breather? has carb

How will this engine last now pls?

nothing is too much information thank you for every think

thanks friend very great information

So if its shot and lose compression..the piston rings are worn out?

That engine is toast.

is there a way use blow by gases as a pump to the intake manifold for a seperat fuel tank Im refering to manual carburetors somthing similar to the SU carburetors

I love these 5E-FE engines. Mine used a decent amount of oil though it had 300,000 kms and 100,000 of them had rev limiter at every shift. I never trust my honda D series motor as much..

Now how do i fix it and not get ripped off and price. And not boring you helped me with what is wrong with my car.

excellent video. Thanks

Hi Brian!!! Can you please help me diagnose a problem with my car over text? I’d be more then happy to pay. Thanks

me, I change the segments of pistons diesel engine 2.0 l ... but now I notice the smoke that comes out of the oil cap with the motor rhythm, after asking the mechanic he confirm me that it will leave with the time, is it normal? ... I drove 250 km with the car, of course having to let it run 8 days in idle for reasons of 8 hours per day, now the draw of the car is a lot better but the story of the smoke, r disturbs me

Really liked the video tnks man! Can Suggest somenthing? A Better mic may isolate Better the sound input of your voice with the engine running. I subscribed , keep up

180k miles. Miracle it even got that far out of a Tercel.

One of my cars has pretty nasty blowby, but it didn't before it sat for a couple months. After sitting, suddenly blowby.

Brian, I'm willing to bet his air consumption sucked that dive. Those arm movements! I need to get back into SCUBA.

thanks very educational

Hi Brian, How do you fix engine blow by ?

good job keep it up

Ovniusa15, At first, I too was a little confused with the term, "blow by". And adding, "suck, squeeze, bang, blow" to this, didn't help either. But, Brian, on a more serious note, why don't all of the cylinders have ignition coils? They appear to be COPs (coil over plugs).

My 07 honda accord has this ! I noticed it after a oil change this week , i checked the oil level and they seem fine what should i do ? 120k miles 4cly honda 2007

Denso plugs FTW!

what happens if I disconnect the crankcase breather from intake housing and let it hang downwards on its own.( but I plug up the air intake housing hole).. will it affect the engine?

Hey Brian is it a bad idea to use antiseize on sparkplug threads ?

Don't worry about it unless it's puffing fumes out of the valve cover with the PCV valve on hooked of course but you don't want you memes coming out of the valve cover or you've got some worn-out ring s

you won't catch me in no ochan doin no cuba divin.

To fix blow by will I need to replace piston rings and pcv valve?

Not all engines have blow by, we had a farmall c that seemed to suck in instead of blow out

Can blow by escape the engine when the cap is fully screwed down?

I have a 2014 accord v6 and engine is clicking

I wish you were my mechanic

I bet that water felt good

firing order correction 1-3-4-2-

It's hard not to do a thumbs up when you're trying to say "that's cool" lol

hi , you forgot to wear safety goggles man!

could blowby cause oil consumption?

Then how to fix it

If I have blow by does it mean my engine has to be rebuilt

Could have bought another Tercel for what they're paying for in oil and fuel.

Brain should either make shirts or magnets or something I can buy to promote I'd love a magnet for my box

Awesome

I wanna see some more busted up junk like this.

No sharks :(

My tercel f/o is 1-3-4-2, not 1-4-3-2, wtf?

When you said probably to much information, I said no such thing.

piston rings are stuck on the Pistons

i thought all 4 cylinder engines firing order are 1, 3, 4, 2.......

oof, now i know im screwed.

If you can't pick on your siblings then who... :-D (all in good fun of course)

i have a sneaking suspicion that brian secretly works for mobile1. someone back me up

wtf was this car driven without a hood for 2 years?