Calibrating your deflators

DrDmoney

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Calibrating Coyote or Staun deflators. I tried this once before using the spare tire and got them close before I got tired of the not so ergonomic confined workspace and I left two of them at what I thought was just a half psi off. I salvaged an old compressor tank to repurpose as a portable air tank around the property. I used a low pressure gauge for gas pipe testing and a shraeder valve, this gave me a high volume low pressure sit down workspace to calibrate the deflators. 8 psi was my target pressure originally and only one of the deflators was at 8 psi the rest were 8.5, 9.2, and 9.6. I put about 12 psi in the tank then screwed a deflator on and let it bleed down till it stopped then I loosened the jamb nut and backed (counter clockwise) to take pressure off the spring in small increments then snugging the jamb nut up so it didn’t affect the pressure setting then add pressure back to the tank and activate the bleeder again to check.
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I went a little too far with the last one and ended up adding pressure back which made it take the longest, all in all I spent an hour and a half including plumbing the tank.

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After setting them all I ran them again and all were good. This can be done on a tire on the vehicle or the spare but it is very tedious and you’ll need an accurate low pressure tire gauge to back check your pressures.
 
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