98 Discovery Air Dryer purge valve leaking

[roknjohn]

Last week I lost all pressure in my air tanks. More accurately, the pressure that I had would hold but it would not rebuild. Upon inspection, I discovered air continually blowing out of the purge valve on the bottom of the air dryer, like it was stuck open. I was unable to get it to close. In order to get home, I bypassed the air dryer using a coupling. The air system worked fine on the way home, btw. However, I am unsure what the permanent solution is.

I did not plug the inlet and outlet ports of the dryer and we have had quite a bit of rain and damp weather this past two weeks. At a minimum, the desiccant filter needs to be replaced, I guess. What about the purge valve? Do I just need a new dryer altogether?

[Skip426]

Depending on the service kit you get for your dryer , a new valve may be part of the kit.

Here's a file on servicing two of the common types of dryers.

[Skip426]

Sorry wrong file in the first post .