Pressure / Vaccum Test: Common & Costly Mistake!!

How do you do a pressure and vacuum test? Start with avoiding this mistake when repairing your engines at home! This oversight with Mityvac's could end up costing you hundreds, if not thousands of dollars in small engine repair bills! This short video will save you time, money and frustration.

TOOLS I USE:

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00:00 Pressure and Vacuum Test Tutorial
00:16 Mityvac Index
00:30 What is a pressure and vacuum tester?
00:49 What brand of pressure and vacuum tester to get?
01:25 Vacuum test on a 2 stroke
02:06 The most common mistake with a pressure and vacuum tester.

#stihl #husqvarna #echo #Honda #diagnosis #mityvac

[VintageEngineRepairs]

If this video helped you, please consider clicking on the THANKS button above to support my channel 🙌

[niconine]

Your tutorials, knowledge & manner of teaching are top tier. So precise & accurate

[jcondon]

Good tip. I was using the vacuum scale wrong!

[Big_Johns]

Well put together video Tom, you're mastering it like a champ. 👍

[b.c.goldprospecting]

Thank you Tom, good information is hard to find, as a 2 stroke tech I must admit I have made this mistake.

[saneauto]

Everything I do wrong &/or fail to do right in my videos becomes glaringly obvious when I watch any of your masterpieces. I especially need to refilm and reedit every repair video especially my first 30 seconds intro and my CTA at the end.

[dennishurlbert]

Triple digits temps in my area, man, thanks for taking the time to inform, and yes bought one finally on your advice, I made my own and it worked but not as slim and refined. Update on the plastic spark plug barbs…they worked great and hardware stores carry a large variety of barbs. Thank you! Take care, be safe.🙏

[SPACEMIKEB]

Thanks! I just put a label on my Mityvac to remind me of this.

[philliphall]

Thank you for sharing information and advice
It’s the best one on the market period 😊

[khndenmark]

Thank you for your willingness to share useful information

[steveriggenbach]

I’ve used and trusted the mityvac for years.

[williamemerson]

Good one! 👍🍻 What about the brands you'd stay away from?

[niconine]

Nice couple of uses there for this tool 👍🏼

[GuysPlayingWithTools]

Great video. It's hard to wrap my head around the jacket when it's 100+ in the shade here. I know it's winter there but It's hard to think it might be cool ANYWHERE 🙂

[elliejackson]

HI,
Just had a look at your comment on reading vacuum. I can see how some people could get confused with the readings on the gauge.
However, that problem only applies to people who still use the imperial PSI scale.
It is so much easier using metric scale. All you have to remember is 50kPa.
if we think of normal atmospheric pressure as 0 kPa then we use 50kPa for pressure testing and -50kPa for vacuum testing. Simple !
BTW 50kPa is the same as 1/2 Bar also known as 1/2 atmosphere
Cheers
EJ

[haneyoakie]

Great info! I plan on adding a tool like this to my shop and I appreciate your input as which tools are a good value. As for the vacuum, that sucks.

I couldn’t resist. Sorry. Not Sorry. 😊

[johnkosheluk]

Yea I have 1 I am a stihl mechanic the problem with that is the pressure release is on the bottom if you put it on the bench you can hit it

[TheGreasyShopRag]

I'm one of the regular users that doesn't pull full vaccuum on those seals. I know Echo generally calls for around 14 inches of mercury. Husky uses a lower number in their training. When I do a vaccuum test I sometimes feel like I'm walking on thin ice. At least twice I know I had a decent seal before I performed the test and wrecked the seal when the outer lip rolled in. Good video, I agree the Mity Vac is a decent tool.

[michaelmounts]

great tool…invaluable for Mercedes’ diesels etc

[alfredprestwick]

Since a crankcase experiences both pressure and vacuum, would it not seem wise to test the seals in both conditions, rather than just only vacuum? I realise that if the seals do seal under vacuum, then they will likely seal even better under pressure, but since while doing the test we are actually not only testing seals, but also the head gasket, (if present), base gasket, de compressor sealing. So for the sake of flicking the switch on the pump, why not just do both, so that all potential leak paths have been tested in both directions.