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DO NOT TRY TO REMOVE THE VALVE CORE AT THOSE PRESSURES.

Just do the push thing. One slip and that core at best is lost at worst injures you or a bystander. They are finicky as hell when you get to the last few threads.

Also, the higher the pressure is, the faster it will deflate. It won’t take that long. Plus, if you do decide to pull the core. At 90psi air rushing out from a small orifice like that is loud enough to cause hearing damage.

Slow controled release of pressures is the standard procedure for any pressure vessel. Be it a tire at 90psi, a radiator at 15psi, hydraulic excavator at 5000psi, or a fuel injection pump at 30,000psi.

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bennypr0fane@discuss.tchncs.de ⁨7⁩ ⁨months⁩ ago
I suppose though, even If handled correctly and if the valve happens to incur no damage during pressure release, the tires will still be garbage after that, won’t they?

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- Mpatch@lemmy.world ⁨7⁩ ⁨months⁩ ago
  Uhhhhhhhh take this with a grain of sodium. But probably not, when your have your wheel at let say max psi on the side wall, so my truck tires are rated for a max of 80psi. Passenger car tires are typically 50psi. Now when you are driving along you hit a big pot hole or ride over a curb. When backing out of the drive way. In that moment that tire pressure will spike as wheel collapses in. Mind you it’s very brief and probably designed for that.
  
  Now The best way to tell would be to look for belt shift or separation. It’s pretty easy to see. There will be basically a bulge on the side of the tire or in the center. Where the belting split apart and the rubber in that spot can stretch like a balloon. You will feel it to. The fucked tire will vibrate alot when driving. Very noticeable. Like rattle your teeth noticeable.
  
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skulblaka@sh.itjust.works ⁨7⁩ ⁨months⁩ ago
This is good advice.

I didn’t figure 90PSI to be all that dangerous, we use a cheetah tank at my job sometimes for seating tires and that fires at 120PSI, but it’s through a much larger orifice - so it wouldn’t be as loud as through the valve stem. Losing the valve core is also a real possibility.

I, a professional dumbass and mechanic, would probably pull the cores at any pressure up to but definitely not exceeding 100, and may very well regret my decision to do so. Any normal people who value their safety and don’t deal with tires on a daily basis, and don’t have a stash of a thousand spare valve stems 20 feet away, should exercise more caution.

Thanks for calling me out on that, I probably don’t respect lowish high pressures as much as I should. I’ll try to keep an eye on that (from behind my safety glasses).

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- brbposting@sh.itjust.works ⁨7⁩ ⁨months⁩ ago
  ^ great response too
  
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- Mpatch@lemmy.world ⁨7⁩ ⁨months⁩ ago
  Yeah, I learned the hard way about pressures and what they can do. Not as hard as others mind you.
  
  I started as a mechanic. Used to have a blast with the cheetah. Hell, I used one to clear out a blocked storm drain one time. That was hella fun. I do a lot of hydraulics now. Around the 90-100psi, you start to run the risk of injection injury, too. Not likely but possible. That’s why they have the safety tips on the blow guns. If the back pressure builds up over 25psi or something, the rubber let’s off and let’s the air by pass. Had a co worker loose a thumb with a paint sprayer. Got to close with the hand he had thick ass leather gloves too. Unlucky I wasn’t there when it happened. probably could have saved it if I rushed him off the e.r sooner but he didn’t know then what hydraulic injection is about and brushed it off. He showed me the next day and told me about it. Boy I near threw him over my shoulder and dragged him to get there faster.
  
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dejected_warp_core@lemmy.world ⁨7⁩ ⁨months⁩ ago
You may also want to push on the valve-stem push valve with a “jesus stick”. This is literally “I wouldn’t touch that with a ten-foot-pole” territory, so go find an eleven foot one with a sharp point at the end.

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