Mario
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- Rio Rancho, NM
Update: Solved by replacing the dryer.
Last year, on my '91 M936A2, the air dryer started purging as soon as I turned on the truck (0psi in tanks).
One of the smart people told me to rotate the 3/8" bolt on the purge port (bottom), and it worked.
It happened again just now and I tried the same but to no avail.
I can push on the purge 'plunger' and make it stop dumping air, but that's obviously unsustainable.
I took the bottom assembly off and cleaned it. Other than the usual oil/grime on the outside (around the snap ring), the insides were very clean.
O-rings looked fine as well.
I put everything back together (sans the protective cover) and started the truck. Immediately the purge valve started dumping air. Please see the video: https://youtube.com/shorts/u1_TPpHUPLo
I don't know enough to troubleshoot it, thus asking for help from the experts.
I did watch a video where the dude was T/S similar issue and in his case, it was the unloader on the compressor that was feeding the purge assembly on the dryer.![IMG_2713.jpg IMG_2713.jpg](https://www.steelsoldiers.com/data/attachments/628/628307-c041776a2c1e757c8ae1493700c799ff.jpg)
![IMG_2733.jpg IMG_2733.jpg](https://www.steelsoldiers.com/data/attachments/628/628308-c371631b2c2ca310d753c0a2187786b2.jpg)
Last year, on my '91 M936A2, the air dryer started purging as soon as I turned on the truck (0psi in tanks).
One of the smart people told me to rotate the 3/8" bolt on the purge port (bottom), and it worked.
It happened again just now and I tried the same but to no avail.
I can push on the purge 'plunger' and make it stop dumping air, but that's obviously unsustainable.
I took the bottom assembly off and cleaned it. Other than the usual oil/grime on the outside (around the snap ring), the insides were very clean.
O-rings looked fine as well.
I put everything back together (sans the protective cover) and started the truck. Immediately the purge valve started dumping air. Please see the video: https://youtube.com/shorts/u1_TPpHUPLo
I don't know enough to troubleshoot it, thus asking for help from the experts.
I did watch a video where the dude was T/S similar issue and in his case, it was the unloader on the compressor that was feeding the purge assembly on the dryer.
![IMG_2713.jpg IMG_2713.jpg](https://www.steelsoldiers.com/data/attachments/628/628307-c041776a2c1e757c8ae1493700c799ff.jpg)
![IMG_2733.jpg IMG_2733.jpg](https://www.steelsoldiers.com/data/attachments/628/628308-c371631b2c2ca310d753c0a2187786b2.jpg)
Last edited: