How To Perform A Leak Down Test - Fast & Easy

[@andrewtackrtt2795]

shoot!!! The 4 examples, or options you gave at the end to help you diagnose the problem, were pure gold 🙏

[@big_time_2023]

I did not understand the glove and exhaust tho

[@JimmyC200]

​​@@big_time_2023 stretch a latex glove over the exhaust tip. If air is getting past the exhaust valves, (and assuming theres no holes/leaks in the exhast pipe) the glove will inflate - identifying potential bent exhaust valve/poor seat.

[@johno4522]

I believe this was an outstanding presentation and this guy knew his business. He’s professional.

[@MasterAutomotiveTraining]

Thank you, glad you enjoyed it!

[@denzdu1970]

I’m not an actual technician, but you have bettered me through your vids. So clear and simple. Oscar, you are very articulate👍🏼 Keep sending great videos👏🏽

[@darwindodge6260]

Air loss in the crank case can be rings or a hole in the past. Put a spoon full of oil in the cylinder and recheck If the air loss improves its the rings. If not its a hole in the piston If I have a loss in the valves I loosen the rocker arms when possible to make sure the valve is closed if you still have air loss It's a bent or burnt valve

[@martincheron1417]

Might be head gasket to.

[@blski]

Excellent right to the point, no bull. This guy is a master

[@tomboytomgirl5356]

Oscar; I'm thoroughly impressed with your professionalism and presentations. You know what you're talking about. I love it!

[@MasterAutomotiveTraining]

Thank you for your kind words and thank you for watching!

[@RedondoBeach2]

Best video on this topic I've seen so far. Great job! I'm a DIY mechanic and don't necessarily need to buy the SnapOn leak down tester featured in your video, but I want to do it anyway. The reason is that buying the tester and performing the test is probably still cheaper than scheduling an appointment for a certified mechanic to do the same work. The bonus is that I'll always have the tester, and will have learned a new skill. This video definitely gets a thumbs up.

[@joelawoyomi9102]

I am about to graduate from a mechanics’ college in London UK but watching both yourASE A6 and A8 clips make me feel despondent. I feel like I haven’t learned much in my three years in college. Keep it up bro, you know your stuff!

[@77smore]

Good information about the glove on the tailpipe. And also pulling a intake hose to hear the leak.

[@ThunderbirdRocket]

Thanks for coaching us ! You are an amazingly talented and dedicated friend of the automotive repair community !!

[@WolfmanJack-ol2rl]

You are very thorough and explaining what you’re doing I like that that’s very professional I too. I’ve been in this industry for 40 years though in the trucking great video thank you.

[@ekimbrough1413]

I love your videos Oscar, straight to the point, and easy to understand!

[@carmelogarcia-w2k]

good simple explanation. I'm a cheap man. I know snap tools are very good tools and expensive. so Im going to lease one from an autoparts store. when Im done just return it and they return my money

[@KellyParker-hb2wy]

I just stumbled on this video today. Because of the excellent presentation here I checked out several of Oscar Gomez's other vids. Oscar is far and away the most articulate auto tech guys I've seen yet. Excellent production from script to the camera work! Glad I found ya.

[@rolandwheeler4842]

GREAT JOB explaining how the tool works and how to properly run the test.

[@MasterAutomotiveTraining]

Thank you!

[@MrCarlos820]

Thank you very clear instructions and expert tips you can only learn from someone whom is a true master mechanic Thanks again!

[@MasterAutomotiveTraining]

Wow, thanks for the kind words and for watching.

[@StevenFranqui]

It’s been a very helpful description on how to perform a leak down test, thanks a lot.

[@tullgutten]

Put an long 1/4 extension in the spark plug hole and turn until it stops rising, then it's at true TDC not + - 20° like that whistle gives you 😅

[@CR-rc5ch]

Agreed. Also worth note there's a TDC for compressive stroke and exhaust. Need to know which one you are on by looking at camshaft lo lobes. Otherwise...the escaping air might just be indicating the the exhaust cam is open as intended.

[@krga94c]

More accurately, the whistle is letting you know the piston is on its way back up on the compression stroke, but not necessary at TDC. To ensure perfect TDC, align the crankshaft to markings on the front of the engine to '0" of the compression stroke by turning the crank manually. Since some engines are virtually impossible to see TDC on the crank pulley, you can also a long plastic straw (won't cause any damage) in spark plug hole to see when TDC is reached.

[@IBWatchinUrVids]

^^ this guy engines

[@joelh3030]

My first time doing a timing belt on a ford escape and my co workers were losing their mind about getting the timing right after putting back together. But i did my research and made sure cylinder 1 was TDC with this exact same method and the timing marks were all lined up. First time starting the engine it ran perfectly and threw no codes. Ran smooth and since then I know to always just check cylinder 1 with a stick in the hole and timing marks in place.

[@kirbyn2010]

You made this simple. A good teacher makes things simple. You are a good teacher and I thank you.

[@shanethornton9067]

Awesome video, especially love the glove technique. So simple I wouldn't have even considered it.

[@HouseCallAutoRepair]

That whistle test is causing confusion. Yes it tells you that you are in the compression stroke, but NOT actual TDC. I ALWAYS use something through the spark plug hole to verify that I am not on either side of actual TDC. Hope this helps.

[@MasterAutomotiveTraining]

TDC indicator is also a good tool.

[@Anonymous51701]

Thanks for the explanation. Didn’t understand that

[@jesseduke694]

Yes^^^^^^thank you!!

[@Jayosf415]

I found putting a balloon on the end of the hose and watch it completely expand before deflation helps alot

[@KellyParker-hb2wy]

@@Jayosf415 Good tip for those of us without a whistle.

[@rockycox753]

This is a very good video explaining how to use a leak down tester.

[@aaronanthonymoat]

I'm loving these vids. I'm not training but I do all the work on my cars so great to learn. Thanks

[@jeffalbro4534]

You were very good at this presentation, loved it!

[@doogeerugged89]

been doing this on and off for 10 years ..... I have never used this tool and I almost never use a compression gauge ... AND today that lack or tool usage has bit me in the butt... and that's a defeating feeling

[@seeoliva]

Super informative, straight to the point and very clear information. This is the kind of video you're hoping to find whenever looking for mechanical guidance on KZbin

[@ingostroup]

Excellent video! Oscar gets right to the point with why, how to and where or what's the problem is. Very professional

[@your20downrange]

I'm so glad I found this channel. My F-150 4.6 2v is missing in #1 during idle. Spark and injector is good. I've considered pulling the intake plenum to check for carbon buildup (280+ k miles), but want to be more sure on diagnosing before I started taking things apart. Subscribed.

[@iesusegoconfidoinvobis4309]

I needed an explanation of a "leak down test", and you nailed it. Thanks!

[@MasterAutomotiveTraining]

Thank you, Glad it was helpful!

[@bluesheep2021]

Great video. Working to diagnose a misfire my CT200h. Just waiting on my tester. Being a Prius engine it's probably the head gasket 😮‍💨.

[@MasterAutomotiveTraining]

Could be, always test to make sure. You got this.

[@lancekirby5725]

Thank you for mentioning the shrader valve. I overlooked that

[@pedroVVILLA]

Oscar a great video easy to understand on a leak down test my suggestion when your ear the whistle crank a little more for better reading because sometime the piston goes back to me piston travel about 3/4 high in the cylinder thanks

[@MasterAutomotiveTraining]

Thats 100% true!

[@MrBobsVids]

Super-pro video, great concise complete information, nicely staged and filmed, thank you!!

[@revamp6612]

I’m very impressed with your videos man. Good teaching skills.

[@AlexOnuskaJr]

Best video I ever stumbled on explaining a leak down test Thank you

[@luisgonzalez0154]

Thank you for this video. It is really helpful. I learned something really important and definitely getting me these tools. So I can give my customers an accurate answer when they ask me about. Thank you.

[@spang650]

This what I called step by step. Thanks for making this video.

[@MasterAutomotiveTraining]

Glad it helped! 😁

[@leomartinez3850]

Love the content, as someone who's currently studying to become a tech I'm grateful to have someone like you who's clarified and helped me understand properly many things. Keep it up, God bless 🙏!

[@musicmaniac2053]

Very Helpful and easy to understand

[@moshewakatelutiw6233]

This is super helpful. Gonna try and do a leakdown soon on my 93 yoda

[@muhammedsons2675]

your teaching method is great well done bro

[@campionoverbagh561]

The diagnostic tips are super helpful Thanks a million

[@johnbaumgartner7731]

Great video explaining the leak down test. I appreciate it.

[@MasterAutomotiveTraining]

Thanks for watching!

[@stevesmelch5073]

Very good. You should also do a video "How to do a how to do video". Very professional!

[@MasterAutomotiveTraining]

Thank you, I'll let our protection team know your positive feedback.

[@javierernestotorres2422]

Love the video and Information. Trying really hard to learn. I do a lot of repairs by my electrical trade and found fascinating all the systems that work together on a car .

[@daveknoblauch6792]

Awesome presentation, clear voice, and easy to follow.

[@timbuss1158]

Great video - short and simple with practical advice!

[@Charitynachinga-q5b]

Beautiful test sir. I have learned something new I never knew about. Keep it up.

[@chadncarrieedwards1919]

Awesome video brother. Thanks for the thorough explanation.

[@MasterAutomotiveTraining]

Any time! Thanks for watching!

[@kenhawthorne4409]

Studying for A1. This was very helpful. Thanks Oscar!

[@michaelbirchall2247]

That's just convinced me to buy one. Great info thanks.

[@fearlous9098]

Dope information as always... great job Oscar keep up good work. Very helpful video

[@davidbachy5627]

Great presentation. Unfortunately, it seems like the only way to know for sure if the valves are truly closed is to take off the valve cover. Maybe place a thin rod down the spark plug hole to confirm it's at TDC. I like to use my mechanics stethoscope rod that unscrews.

[@josephday754]

Very informative and answered all of my questions. Thank you.

[@BillBresnahan]

Oscar , great job describing this procedure for this dummy.. although I’ve discovered I need some engine work or a new truck

[@mowen64]

This was a very informative and well done video and very educational, Great Job😁

[@MasterAutomotiveTraining]

Glad you enjoyed it!

[@FLiPSyDe71]

Awesome... thank you very much, Oscar. This was very informative.... going to buy a tester now.

[@dawitkassa3131]

Very informative video. I rebuilt my toyota engine, and it fired up on the first attempt. However, I noticed within a minute that exhaust pipe overheating and compression loss. I was confused and thinking where to diagnose. now your presentation explains well. Please let me know if i need to test something else. Tku

[@MasterAutomotiveTraining]

Tell me more. The exhaust is getting excessively hot? You ran a compression test and saw low compression? Have you tried testing engine vacuum?

[@dawitkassa3131]

@MasterAutomotiveTraining Thank you for your response. Ya, the exhaust tuns red hot in 30-40 seconds. RPM was also high, I assumed it was cold start. I did the tests you mentioned; and Cylinder 2&3 compression was lower than the others two. I pulled the cylinder head and made all side block deck surface measurements. As I suspected, I found low spots in the middle, the center deck of 2&3. cylinders. I am not a rebuild specialist, but I think huge compression escapes in between these two cylinders that cause blowby. Also, i found dark oil lying over the head.The almunium head measurement looks good because it was resurfaced. I don't know how I forgot to resurfacing the deck. So, I guess the chances might be to pull the engine out for deck resurfacing or do the resurfacing manually without pulling the engine. Someone suggested using a graphite head gasket for better sealing. Thank you again

[@righteousman8488]

Best explanations, thank you Oscar

[@MasterAutomotiveTraining]

You’re welcome, thank you for watching.

[@daewonshaun1]

Very very well explained. Great job Oscar!

[@remoffcasimir5956]

Keep up the good work guys the video was pretty much understandable

[@koltontrombly8422]

Great very informative video. Thank you for sharing that knowledge

[@ThePlaybass]

Simple and to the point! Great vidio!

[@manuelhernandez3568]

Es necesario remover el termostato para ver si salen burbujas por la tapa del radiador te agradecería tu respuesta y un suscriptores más 👍

[@yangyang3175]

the guy that invented this test is a genius ! newbie question: is the cylinder (ring against wall, and valve against seat) supposed to be completely air tight like a balloon ? ---- pretty amazing assuming it's made with steel

[@MasterAutomotiveTraining]

Vale seat yes, pistons rings will have end gaps so they aren't fully sealed.

[@ClarkKalkowski]

Great information for us shade tree mechanics

[@tugsman5]

Me, "that whistle tool seems like the dumbest thing I've ever seen in the history of automotive tools." Halfway through the video, "so it didn't work" lmfao

[@Soundboy61088]

Just put a straw down the spark plug holes and rotate crank by hand until the straw indicates TDC.

[@robeverywhere7414]

Good explanation. Good job 👍

[@jeremyblanton1445]

EXCELLENT! Thanks for posting!

[@varmastiko2908]

So what's the deal with green area reaching as high as 40% leakage when usually it's said that 10% is a healthy maximum and 20% is where real trouble starts; 30% you need a rebuild right now. I would love to hear your thoughts. Even some workshop manuals say anything past 25% means serious issues.

[@badgerbait8351]

"Where the hell is it going?!" Love it! Thanks!

[@goldmentality83]

Thanks, that's great information. I have a 2022 honda civic and with the car running when I remove the oil cap theres air blowing out. When a shop performed a compression test it came back good, so I'm wondering if the leak test would be helpful or if its even related....

[@salvadormorales2402]

You’re a great teacher

[@Zi.Zenior]

Awesome video. Very detailed and good pacing

[@MasterAutomotiveTraining]

Thank you kindly!

[@claudelemessy6780]

Very good training love it I learned a lot thank u

[@jimbarratt9254]

Well done! Great instruction!

[@MasterAutomotiveTraining]

Thank you so much!

[@clutchitsystems100]

Great video. When it comes to these leak down testers, I don't really too much for the knob function. I dunno. Sees it could have a numbered dial on it. As it is, yuh turn it out to some undetermined point until no air passes thru - and then begin turning it in... That is, a precise instrument should have a precise/calibrated/numbered dial.

[@lolatu8255]

The instrument doesn't know how much air pressure is coming in, is it 125psi? 150psi? 175psi? so you have to adjust the inlet pressure to make it work.

[@franciscocastaneda1997]

Very Good information, Thanks 👍

[@MasterAutomotiveTraining]

Glad it was helpful!

[@filipos7459]

Cylinder 3 is good but then you shows a bad cylinder which is also number 3. Same cylinder two different results; was it good or bad?

[@MasterAutomotiveTraining]

We purposely made it fail for the video.

[@cobbysparks9891]

Thanks for the video. I guess the whistle can’t be used with push to start ignition systems right?

[@MasterAutomotiveTraining]

Don't think so, as they crank for a predetermined time.

[@cobbysparks9891]

@@MasterAutomotiveTraining Thank you

[@ricardocenteno375]

If you get air out exhaust it’s exhaust valve damaged or not sealing also if you put compression on cylinder 3 and it leaks out cylinder 4 when spark plug is out it could be a crack in between the cylinder head wall that both cylinders share 😊

[@danijelr91]

Perfect explanation! Well done!

[@MasterAutomotiveTraining]

Glad you liked it!

[@schuck9326]

Great detail explanation. New subscriber. Thanks

[@MasterAutomotiveTraining]

Thanks for the sub! I'm glad you liked it.

[@dinonaccarato2989]

Great explanation, keep it going. God bless

[@michaelplonski9953]

Great video!!!! Thanks for the knowledge!!!

[@MasterAutomotiveTraining]

You're welcome anytime!

[@tunez4moodz34]

I have an i20, 2010 model, 1.6.My issue I'm experiencing with the car is that its not driving smoothly as it was. I took it the manufacturer to diagnose the problem and they told me, that compression was low in one of the cylinders, with a 120psi reading and the other 3 were 149 to150 psi between them. So they wanted to strip and see what's the problem and unfortunately I don't the money to cover that cost of stripping .I have read that 120psi is not that bad for one cylinder, just looking any other opinion. I have put fuel injector cleaner and valve ease but the problem still there. Funny thing on some days it drives well, no jerks, bad idle, misfiring and no wanting to switch off at stop/start traffic. The car has 165milege on it. I have attached an image of the report from manufacturer. Any advice would be highly appreciated regards Ayanda

[@MasterAutomotiveTraining]

If it's low on compression, I'd run a follow up test of cylinder leak down to pinpoint where the loss of compression is going.

[@_FreedomSeed]

This was a great how to. I 2nd the no music request

[@d2d601]

Good job

[@MasterAutomotiveTraining]

Thank you for watching.

[@sasindudinusha3847]

Great content mate

[@MasterAutomotiveTraining]

Thank you for watching!

[@Andy-Andeee]

So bubbles on the coolant with cold engine/engine off, means head gasket ?

[@MasterAutomotiveTraining]

Or a cracked engine block.

[@jessweston9493]

Super helpful video!! Is there a way to isolate the cracked engine block diagnosis @masterautomotivetraining from the potential head gasket option? Just got our leak down test kit today to test a 2000 Toyota Celica SX (australia) - we've done a compression test on cylinder 3 and there is zero compression so hoping the leak down can tell us if we can just remove the cylinder head and have it overhauled/repaired - or if she actually has a cracked block and needs an engine replacement 😢

[@paulmuff9883]

Nicely explained 👍

[@MasterAutomotiveTraining]

Thank you 🙂

[@elijahlundberg7934]

That "glove to exhaust" test you were referring to. At what point do you make that test? & if it was an exhaust valve issue, do you have any videos on how to repair that particular issue? -Thank you in advance, you've just earned a suscriber today.

[@MrJ183]

You test that when the cylinder is pressurized. If air escapes when the piston is at tdc the exaust valve is burnt/bent and leaking. The fix would be to clean the valve and lap. If it was bent you would just replace it

[@Mike-qo4kp]

Two thumbs up man

[@MasterAutomotiveTraining]

Thank you my friend

[@artramirez3506]

Awesome informational video mang. Thanks. Now, do anyone got a link for a good budget leak down tester kit? I don't has Snap-On moneys. LOL

[@MasterAutomotiveTraining]

Matco or the MADDOX from Harbor Freight has done well with the testing we have put it through here at the school and shop. Don't cheap out ont he compression tester tho even the MADDOX sucks, super in accurate.

[@trukitss]

Great video..clear and precise definitions and instructions.

[@hitbythese]

Helped me out! I don’t hate the music

[@erikthered3601]

Your video was very informative. You explained it flawlessly!!

[@LuisGarcia-ux4ie]

Good video very well explained teacher

[@RandyFoss-wk9hq]

Well done!

[@MasterAutomotiveTraining]

Thank you for watching!