Spent most of the weekend freshening up my tow vehicle, 05 Ram 3500 Single rear wheel, Quad cab 4x4, but in between draining or filling one fluid or the other I also recalibrated my Coyote deflators. I tried this once before with the spare tire and got the 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 potable 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.
Only one of the deflators was at 8 psi the rest were 8.5, 9.2, and 9.6. One thing I’m not fond of the rings that are on them and I might source something different or leave them off. I put about 12 psi in the tank then screwed a deflator on and let it bleed down till it stopped the 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
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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.