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How To Pressure & Vacuum Test (Under 4  minutes!) - SAVE YOUR 2 STROKE ENGINES! 

Vintage Engine Repairs
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A pressure and vacuum test is the most important test on a 2 stroke engine. It can save a seized top end and diagnose running issues you’ll have when there is an air leak. It doesn’t matter what engine you’re working on from stihl to husqvarna, echo, Kawasaki and Honda. Chainsaws to motocross bikes and even outboard motors, if they have a 2 stroke engine you need to pressure and vacuum test them. This diy tutorial will help you at home complete this process!
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Any links to products are likely to affiliate links and I may earn a small commission from qualifying purchases with no additional costs to you. Thank you!
#pressuretest #chainsaw #vacuumtest #2stroke #engineeepair #yamaha #hondaengine

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16 янв 2023

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Комментарии : 119   
@savage22bolt32
@savage22bolt32 3 месяца назад
I've watched a few of these press/vac test vids. This is the first one ive seen that knows that vacuum is NOT PSI, but in/hg (or mm/hg). Also: Thanks for the wonderful video, and a huge thanks for not ruining it with crappy background music, and getting right to the point, skipping a lengthy, repetitive intro/outro! ❤❤❤❤
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
Hey :) thanks for the kind words! I really appreciate it!
@niconine268
@niconine268 2 месяца назад
Yes. Can't fault this channel at all.
@TheGreasyShopRag
@TheGreasyShopRag Год назад
At least a couple major engine manufacturers teach techs that up to 1 pound pressure loss in the first minute is ok. I monitor that when making warranty claims but for other repairs I figure its either tight or it gets fixed. Good video!
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks for sharing Scott! I’m like you, it’s either tight or it’s not, if it’s not, I’ll find it lol. Thanks for watching! My SparkCheck’r should arrive in a few days, I look forward to trying it out after seeing it on your channel.
@b.c.goldprospecting1724
@b.c.goldprospecting1724 Год назад
Quick and simple. I do the exact same procedure on all 2 strokes that come into our shop. Good video
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Good job B.C, it can save so much time and tail chasing can’t it! Thanks for watching :)
@niconine268
@niconine268 2 месяца назад
So cool. Somewhat of a game changer for me
@niconine268
@niconine268 2 месяца назад
​@@VintageEngineRepairsYes exactly
@donmayberryjrsOPE
@donmayberryjrsOPE Год назад
Awesome!!! THIS is what we all need to do more often! So many times I've spent many hours repairing a 2-cycle engine and thinking all is ok only to find out....oops, should've done that vacuum and pressure test!! I'M STILL KICKING MYSELF!!!
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Quite right Don! 2 main things I always check on a 2 stroke, first the exhaust port for piston skirt scoring and the other is a P&V test :) thanks for watching!
@donmayberryjrsOPE
@donmayberryjrsOPE Год назад
@@VintageEngineRepairs excellent video! Well done!!
@kevinjohansen8149
@kevinjohansen8149 Год назад
Good summary. I do vacuum test first, because sometimes when you’re pressurize first it’ll force the lips against and pass the vacuum later but if you do the vacuum first, sometimes it will leak
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks for the heads up, I have heard that but never experienced it myself! I do pressure first just to avoid, in the very unlikely event of accidentally sucking up of fluids that may be in there lol
@justinanderson9280
@justinanderson9280 Год назад
That’s awesome Tom, the tapered tube rubber is a simple solution to seal everything. I was dreading making all different sized rubbers to seal my different chainsaws. I won’t have to now and I can try out my new vacuum tester 👌🏻
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Glad it helps Justin!
@andriyshulga2944
@andriyshulga2944 Год назад
Thank you very much for your concise and informative videos!
@VintageEngineRepairs
@VintageEngineRepairs Год назад
My pleasure :)
@eduardo_k
@eduardo_k Год назад
It doesn’t get any easier than this, great video! Oh and the tapered pieces of inner tube - brilliant idea! Thanks for posting.
@VintageEngineRepairs
@VintageEngineRepairs Год назад
My pleasure :) glad it helped
@Big_Johns
@Big_Johns Год назад
Thanks for the demonstration Tom, I use the cut up inner tube as well. 👍
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Good job mate, makes it super speedy doesn’t it!
@tinkeringtaylor3053
@tinkeringtaylor3053 Год назад
Great tip Tom thank you 👍
@Non-Stick_Pan
@Non-Stick_Pan 10 месяцев назад
Great to find more uses for my Mityvac now! I bought mine a few years ago and only used it once to preload a new turbo actuator for my car, it's been gathering dust since. I've already made one of your adapters from an old spark plug :)
@VintageEngineRepairs
@VintageEngineRepairs 10 месяцев назад
Great stuff! Glad you’re enjoying my content!
@battlehrfred
@battlehrfred 5 месяцев назад
excellent sir 100-100 lot s of info in 5 minutes!! ty so much
@VintageEngineRepairs
@VintageEngineRepairs 5 месяцев назад
You’re very welcome!
@radekp.562
@radekp.562 Год назад
Great, I was looking for exactly this procedure to test my engine.
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Great :) hope it helps!
@niconine268
@niconine268 2 месяца назад
Im impressed once again. This is a top method for closing up intake & exhaust without getting freeze plugs & plates drilled to manifold spec
@VintageEngineRepairs
@VintageEngineRepairs 2 месяца назад
Thank you :)
@user-nw9so4vk8f
@user-nw9so4vk8f 8 месяцев назад
Nice job man. Practical thinking
@VintageEngineRepairs
@VintageEngineRepairs 8 месяцев назад
Thanks! Glad you enjoyed it!
@KensSmallEngineRepair
@KensSmallEngineRepair Год назад
I like the timer feature, good Vid Mate!
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks Kenny!
@RobsChannel-dc1nn
@RobsChannel-dc1nn 3 месяца назад
Very informative, thanks for sharing.
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
You’re welcome :)
@barryewalt3250
@barryewalt3250 Год назад
Great video again Tom..
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks Barry
@BrucesShop
@BrucesShop Год назад
Thanks Tom. I missed the vacume test on my old saw. I did do a pressure test .
@VintageEngineRepairs
@VintageEngineRepairs Год назад
You’re welcome Bruce! Yeah that vacuum test is certainly important :)
@GuysPlayingWithTools
@GuysPlayingWithTools Год назад
That's a good test for case leaks. Sometimes looking at the cylinder walls won't tell the whole story.
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Spot on bill!
@williamemerson1799
@williamemerson1799 Год назад
Excellent as always.👍🍻 Still have an old plastic MV from the early 80's used to check vacuum advance, but it's vac only. Me thinks there's an 8500 in my future. Thanks for spending $75-$80 for me.🤣
@VintageEngineRepairs
@VintageEngineRepairs Год назад
That’s awesome :) thanks for sharing!
@almclean4835
@almclean4835 Год назад
Great video Tom,
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks Al!
@BSSMALLENGINES
@BSSMALLENGINES Год назад
Great video Tom
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks Brandon!
@spelunkerd
@spelunkerd Год назад
What an excellent channel, we think alike.
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thank you! How did you find me?
@RayofallTrades
@RayofallTrades Год назад
Very well done video my friend
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thank you!
@user-ub6zl8qy7l
@user-ub6zl8qy7l 3 месяца назад
Thank you for such a clear and concise production! One question ... during the vacuum test there's a settling-down period at the beginning: the gauge keeps dropping toward zero and it looks like the vacuum isn't holding. You keep pumping and wait a while, and eventually get a stable vacuum to begin the test. What's going on during that settling down period? How can you tell you're not seeing an actual leak? Thank you again. Absolutely excellent video!
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
Thank you! That’s the air bleeding past the piston rings as well as the rubber inner tube stretching and seals too! Keep pumping until you no longer see it drop :)
@robcole332
@robcole332 19 дней назад
What a great video
@VintageEngineRepairs
@VintageEngineRepairs 19 дней назад
Thanks!
@stevo3644
@stevo3644 3 месяца назад
A smoke test I find very helpful as well as you can identify where the leak is coming from.
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
Interesting, I use it for a leak down test but not a pressure and vac test!
@matthewwetzel7671
@matthewwetzel7671 Год назад
Great video thank you
@VintageEngineRepairs
@VintageEngineRepairs Год назад
You’re welcome :)
@ODWALLA123
@ODWALLA123 11 месяцев назад
I Appreciate You !
@VintageEngineRepairs
@VintageEngineRepairs 11 месяцев назад
I appreciate you haha thanks for watching and commenting :)
@wow344wow
@wow344wow 8 месяцев назад
Hi V E R, thank you for this very informative video. Can you please advise on a good budget vacuum/pressure with dial unit that is suitable to read small 2/4 stroke engine's. I have 4 small engines but cannot afford the 8500 unfortunately.
@VintageEngineRepairs
@VintageEngineRepairs 8 месяцев назад
Hey, glad you enjoyed it! Look on eBay :) one that does pressure and vac is important! Hope it helps :)
@356Rover
@356Rover Год назад
id be interested in seeing you do this on an old outboard 2 stroke!
@VintageEngineRepairs
@VintageEngineRepairs Год назад
If one comes along, absolutely!
@356Rover
@356Rover Год назад
​@@VintageEngineRepairs hopefully a nice 6 cylinder tower of power
@rolfgrosseholz1311
@rolfgrosseholz1311 11 месяцев назад
That sort of test will only show you if its bad. In college we tested them under water to find all the leaks. That is the short engine. That will pick up the small leaks.
@VintageEngineRepairs
@VintageEngineRepairs 11 месяцев назад
Pressure tests will often hide an oil seal leak in 2 strokes as the sealing lip gets pushed down and onto the crankshaft. The vacuum test is the correct test to do for an oil seal. That’s certainly not something you want to do under water - or with any water for that matter.
@rolfgrosseholz1311
@rolfgrosseholz1311 11 месяцев назад
@@VintageEngineRepairs I was trying to cover all leaks. The one under water i was talking about in college picked up a defect in the cylinder casting. Little bubbles coming out at 5 psi. Others had leaks at crankcase bolts on Victa engines etc.
@justinf1343
@justinf1343 2 месяца назад
Thanks for sharing. Will this be the same for a 2 stroke stone saw, that I don't think has oil inside the crankcase. Well, at least I have not seen anyone mention draining oil when replacing crank bearings.
@VintageEngineRepairs
@VintageEngineRepairs 2 месяца назад
As far as I am aware, concrete saws are 2 strokes, same principles, yes! :)
@vinopan5374
@vinopan5374 11 месяцев назад
Excellent video, at 3:53 min you say 15psi I believe you mean 15 in Hg, correct?
@VintageEngineRepairs
@VintageEngineRepairs 11 месяцев назад
Spot on, my apologies - thanks for the correction!
@jeannettehyppolite9912
@jeannettehyppolite9912 Год назад
Good!
@baileybattistuzzi5651
@baileybattistuzzi5651 Год назад
Hey tom, How did you make the spark plug for pressure testing ?
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Just cut the crimp off the metal spark plug, remove it from the porcelain and then add a barb, glued in place wjth epoxy and add an o-ring
@Gssmallenginerepair
@Gssmallenginerepair Год назад
Hello sir, could you do a video with the engine on the machine. Like how would you block off the exhaust port of the shroud is still on the engine? Let’s say a stihl weedeater? Thx
@VintageEngineRepairs
@VintageEngineRepairs Год назад
You can’t you need to take the cowling off to get to the muffler :) thanks for watching!
@Gssmallenginerepair
@Gssmallenginerepair Год назад
@@VintageEngineRepairs ty sir.
@sypher0101
@sypher0101 Год назад
I'm a little confused about the vacuum test. You did a pressure test first which passed, meaning there's no leaks, including past the piston rings, correct? If so, how does a vacuum test via the spark plug test the oil seals, if the rings tested ok? Why wouldn't the vacuum remain in the cylinder and not suck from the area around the crankshaft?
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Because it passes through the transfers :) also past the rings too! Thanks for commenting 👍👍
@Gssmallenginerepair
@Gssmallenginerepair Год назад
Great video. Do you have to remove the engine like you have it there?
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thanks! You don’t have to, you can just block the ports, if it holds then great. If you find it’s leaking, then stripping parts off to get access to the leak is necessary.
@Gssmallenginerepair
@Gssmallenginerepair Год назад
@@VintageEngineRepairs thx for the reply. Could you tell me what size barb and thread size is the fitting. Like 1/4 x 1/4? Thx
@bretthaas4606
@bretthaas4606 11 месяцев назад
Can you seal it off from the other side of the carburetor? I did on a weed eater and found that the shaft for the butterfly valve was leaking air. The weed eater runs okay but I’ve had issues keeping the air/fuel adjustment consistent.
@VintageEngineRepairs
@VintageEngineRepairs 11 месяцев назад
There will be a very slight leak even from a good throttle shaft, but it should be minimal. That can mess up the reading, pressure test that separately :)
@bullitanaconda
@bullitanaconda 5 месяцев назад
Im curious to know how did you do the spark plug connection
@VintageEngineRepairs
@VintageEngineRepairs 5 месяцев назад
Hey, i did a video on it :) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WukO9adv0cs.htmlsi=QkFspQVWau82cYl8
@01bonny790
@01bonny790 Месяц назад
I understand the soapy water to check for leaks under pressure, but how do you determine the source of vacuum leak? You mentioned light oil, do you start dripping oil around possible leak points and watch for when the vacuum gauge stops dropping? Loved the video, it took a lot of the mystery out of performing the tests!
@VintageEngineRepairs
@VintageEngineRepairs Месяц назад
Thanks for the kind words, the only place that will leak under vacuum and not always under pressure are the seals. Therefore, yes very thin oil, or better yet 2 stroke fuel and oil mix. :)
@01bonny790
@01bonny790 Месяц назад
Thank you so much, that's very helpful. I've been around engines for decades, but I'm new to 2 strokes and channels like yours make it fun to learn, cheers
@pauliekruger7639
@pauliekruger7639 Месяц назад
Great. But how do you build that spark plug air adaptor? JB Weld?
@VintageEngineRepairs
@VintageEngineRepairs Месяц назад
Yes - I made a video on how to make one :) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WukO9adv0cs.html
@pauliekruger7639
@pauliekruger7639 Месяц назад
@@VintageEngineRepairs thank you
@ricks5984
@ricks5984 3 месяца назад
In addition, maybe a smoke test to seek out any leaks??
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
That is more for a leak down test, the pressures are way too low to show any smoke dissipation. Unless you some how pumped smoke in to the engine maybe!!! As a point of reference, a leak down test (with smoke) is normally done at around 100 psi, a pressure and vac test around 5psi.
@facundopereyra8455
@facundopereyra8455 5 месяцев назад
Can i use this to see if there is a air leak around crank seals?
@VintageEngineRepairs
@VintageEngineRepairs 5 месяцев назад
That’s correct yes.
@gabrielx2389
@gabrielx2389 7 месяцев назад
hi, I'd like to know how you make the adapter, will you make a video for it ?
@VintageEngineRepairs
@VintageEngineRepairs 7 месяцев назад
I have already :) have a look through my videos 👍
@gabrielx2389
@gabrielx2389 7 месяцев назад
@@VintageEngineRepairs thank you my friend
@rockyholt4060
@rockyholt4060 Год назад
Where can I get one of those spark plug adapters?
@VintageEngineRepairs
@VintageEngineRepairs Год назад
You just make them :) I’ll do a video!
@dousuke1979
@dousuke1979 23 дня назад
whats the thing that you screw in the cylinder instead of a spark plug called?
@VintageEngineRepairs
@VintageEngineRepairs 22 дня назад
I made it :) ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-WukO9adv0cs.htmlsi=twwu8TiJfI3Wn0ih
@tobesmith7632
@tobesmith7632 8 месяцев назад
I don't know about going through the spark plug hole to check. the pressure And vacuum. That cylinder he's going to hold 150 PSI..
@VintageEngineRepairs
@VintageEngineRepairs 8 месяцев назад
You’re confusing compression and pressure there. Yep I like to test through the spark plug hole if possible.
@xx3868
@xx3868 6 месяцев назад
Worse if your engine sort of runs ok but shuts down after 10-20 mins hot and fuel system is ok?? Drove me crazy till i realized the coil was de- laminating and shorting when HOT! I guess to test you could put a hair dryer on the coil and watch the resistance go down a bit? and then suddenly short out!!
@VintageEngineRepairs
@VintageEngineRepairs 6 месяцев назад
Thanks for sharing :) yes a classic coil issue! Or a failing condenser in the old machines
@kwinngeer9070
@kwinngeer9070 3 месяца назад
what tool did you use?
@VintageEngineRepairs
@VintageEngineRepairs 3 месяца назад
Here you go :) Mityvac Pressure & Vacuum Tester - amzn.to/3vysI3V
@kwinngeer9070
@kwinngeer9070 3 месяца назад
@@VintageEngineRepairs Thank you!
@DicksSmallEngines
@DicksSmallEngines Год назад
Marvellous explanation & demonstration mate ! 👏🏻👍🏻🔧
@VintageEngineRepairs
@VintageEngineRepairs Год назад
Thank you Dick!
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