How To Perform A Leak Down Test - Fast & Easy

Steps on how to do an engine leakdown test:
Step 1 : Remove the spark plugs and rotate the engine to put the cylinder to be tested at TDC. Tip: Insert a long screwdriver or extension into the spark plug hole and turn the engine by hand with a socket on the crankshaft. When the screwdriver stops rising or falling, you’re at TDC. Don’t turn the engine backward if TDC is missed. Go around again. In a four-cylinder engine, cylinders one and four and two and three are at TDC at the same time.
Step 2 : Figure out which spark plug adapter works best and connect the gauge into the hole. Put the vehicle in gear and set the parking brake to prevent the engine from turning when air is compressed into the cylinder. Start with the regulator turned counterclockwise to zero the incoming pressure. Connect compressed air. Turn the regulator clockwise to pressurize air into the cylinder.
Step 3 : Record leakage percentage for the cylinder. Remove the oil dipstick, radiator cap and oil filler cap. Open the throttle body or remove the air cleaner. Listen and watch. Wherever air is escaping will indicate where the problem is. Disconnect the gauge and move to the next cylinder.
Follow along as I teach you how to do engine leak down testing, whether you are an automotive technician or a DIY-er looking for tips us pros use.
Grab your tools, lets get ready, lets hit it!
#enginecompressiontesting #compressiontest
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[@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

[@dennisdulay175]

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👏🏽

[@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

[@motosystemltd]

Turn the engine at crankshaft until the pressure start build up on right gauge, also You start feeling the force on spanner with long arm preferred.

[@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

[@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.

[@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

[@user-rn1vc2lz7e]

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

[@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!

[@mowen64]

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

[@user-pl2lx5cr1d]

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

[@ThunderbirdRocket]

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

[@MrBobsVids]

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

[@Nishimachi_Photography]

Thanks for the explanation

[@blski]

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

[@ekimbrough1413]

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

[@timbuss1158]

Great video - short and simple with practical advice!

[@staceyhill846]

Great job- thank you!

[@musicmaniac2053]

Very Helpful and easy to understand

[@ianfournier]

Great explainations!

[@aaronanthonymoat]

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

[@daewonshaun1]

Very very well explained. Great job Oscar!

[@brianpiper3188]

Excellent! Thank you very much!

[@remoffcasimir5956]

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

[@revamp6612]

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

[@trukitss]

Great video..clear and precise definitions and instructions.

[@paulmuff9883]

Nicely explained 👍

[@derek9987]

Great video. Very informative 👍

[@vin605]

Video was helpful, thanks for sharing

[@spang650]

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

[@MasterAutomotiveTraining]

Glad it helped! 😁

[@bradleywesterford3587]

excellent video! very informative.

[@ingostroup]

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

[@user-is1ln4df7p]

I loved the info provided Thank you very much for sharing

[@moggie100th]

Great video - thanks for sharing this info.

[@campionoverbagh561]

The diagnostic tips are super helpful Thanks a million

[@lancekirby5725]

Thank you for mentioning the shrader valve. I overlooked that

[@user-nj6su1jh9d]

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

[@davidportillo2463e6]

Grate video , thank you very much

[@samspade8612]

Excellent video! Very informative.

[@hypetekauto]

Excellent well explained video!

[@claudelemessy6780]

Very good training love it I learned a lot thank u

[@CarlosRivera-nn1ze]

Thank you ! Really helpful

[@treverjeffery550]

Thanks, definitely helpful..

[@josecuevas3440]

Great lesson .

[@LuisGarcia-ux4ie]

Good video very well explained teacher

[@ZimaletaMotors]

Nice job

[@eddkennedy6458]

Very well explained, thank you,

[@kenhawthorne4409]

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

[@FLiPSyDe71]

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

[@joaquinaguirre2976]

"Excellent video thank you Mr. Master.

[@moshewakatelutiw6233]

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

[@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.

[@jasonguzman8417]

Solid instruction

[@77smore]

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

[@LuisTorres-ly7rf]

great video. tremendo video gracias hermano.

[@dinonaccarato2989]

Great explanation, keep it going. God bless

[@TheSevillap]

Really good video and awesome information.

[@SuperSpiderHulk]

very educational

[@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 .

[@fabe202]

Great presentation

[@MasterAutomotiveTraining]

Thank you for your support! 😁

[@joycemarkdoyola766]

Very good explanation Sir thank you good bless

[@paayoub]

thanks, learned a lot

[@jimbarratt9254]

Well done! Great instruction!

[@MasterAutomotiveTraining]

Thank you so much!

[@rickygeorge1726]

Great video

[@Hdlc27]

Very good insight.

[@MasterAutomotiveTraining]

Thank you for watching.

[@mrkultra1655]

Thanks

[@johncantonwine8918]

Very good

[@michaelplonski9953]

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

[@MasterAutomotiveTraining]

You're welcome anytime!

[@danijelrd]

Perfect explanation! Well done!

[@MasterAutomotiveTraining]

Glad you liked it!

[@salvadormorales2402]

You’re a great teacher

[@chadncarrieedwards1919]

Awesome video brother. Thanks for the thorough explanation.

[@MasterAutomotiveTraining]

Any time! Thanks for watching!

[@d2d601]

Good job

[@MasterAutomotiveTraining]

Thank you for watching.

[@keithwright5160]

Great info

[@hitbythese]

Helped me out! I don’t hate the music

[@Howto-jc6vs]

Great advice

[@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 🙏!

[@erikthered3601]

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

[@vioreltandara7607]

really good job

[@4-5-6chevytrucksllc5]

Good stuff!

[@righteousman8488]

Best explanations, thank you Oscar

[@MasterAutomotiveTraining]

You’re welcome, thank you for watching.

[@daletom9871]

very useful thanks

[@MasterAutomotiveTraining]

You are very welcome.

[@stevepalenicek4690]

Nice bro respect. Good knowledge 👌 your smart brosky

[@user-yz5rj7wp8m]

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

[@randomrebuilds]

Good, shortened up video. Don't want to sit through 30 minutes going through reading gauges on a tool. You covered it in 1/3 of the time!

[@konstantind5074]

Wow quality education right here 👏

[@khandsum]

Helpful thnx

[@motosystemltd]

Great, its my favourite tool, I seen cases where compression was good, but was leaking badly when using this tool. When air is definitely leaking then i putting at tdc my smoke machine which have little compressor buid in and its helps much easier where the smoke comminng from

[@keithbland5365]

I like your presentation would like to know where do you get the twist in whistleblower I have the old-fashioned one that you hold onto the cylinder

[@scopediagnostics3742]

Nice information 👌 👍

[@MasterAutomotiveTraining]

Thank you sir!

[@Tyronetrinity]

Love this video!!

[@ThunderbirdRocket]

Nice !!

[@robertregalado9906]

Good

[@blakesmith7922]

It was very helpful

[@MasterAutomotiveTraining]

Thanks for watching and your support!

[@user-hj7ic9qo4m]

TY

[@badgerbait8351]

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

[@microsoftteams2663]

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.

[@user-fk3zl8oj1l]

Buen dia lo puedes hacer en español ..?

[@adnansuleyman530]

شرح مميز

[@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?

[@guerrasnganga4674]

Best ever

[@nickayivor8432]

Merry Christmas 🎅 🎄 Master Automotive Training My teacher SUBSTANTIAL Master Automotive Training Thanks 👍 From Nick Ayivor from London England UK 🇬🇧

[@MasterAutomotiveTraining]

Happy holidays!