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Water drain valve leaking


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2008  Sportchassis cummins 8.3.

I have 2 air tanks, and both have that needle valve thingy on them you're supposed to push now and then to expel any condensed water inside.  One of them has a slow leak, and I'm not sure how to stop it.  I have crawled underneath and fiddled with it, and I got the leak to become less, but I can't stop it and it allows my rear suspension bags to deflate over a few days.  

The next thing I may try is pushing it open and blowing air back up into it, thinking there's something like a grain of sand stuck on the lip. I hesitate to take it apart as I'm out in the sticks and I don't need any catastrophes.

Anybody have any ideas?  Thanks

Edited by hemsteadc
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Just now, Ray,IN said:

Buy a new one before removing this one or  remove this one and insert a pipe plug until you do find a new one.

Are they standard pipe threads?  I really don't need this thing as it never has any water in it.

Edited by hemsteadc
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A pipe plug is a temporary patch, the air drain is required. As rickeleio said when the air dryer is functioning as designed very little/no water will be in the tank, If there is water in the tank there is a chance water also found its way into the air brakes, which can be a dangerous and expensive situation.

For semi-tractors, if stopped by DOT, they will pull the cables to the manual air drain fitting for a test. That is how important the manual drain valve is to safety.

The most important item to avoid moisture is the air dryer assembly, including its regular maintenance.

Edited by Ray,IN
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13 minutes ago, hemsteadc said:

I don't have air brakes.

Here we go again. You still have an air system, that needs care and attention. If you skip over it, you'll end up paying in the future. Either when you have to replace extra parts due to rust, or when sale time comes, and the buyer catches your skipped maintenance.

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Example on Amazon for $13.

I only maintain truck air systems with parts "intended for a truck or bus" (sorry I don't know the correct backed up by documentation to prove it term) often found at the truck dealer's parts dept. or a reputable commercial vehicle aftermarket source.  

 

Edited by noteven
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47 minutes ago, noteven said:

 only maintain truck air systems with parts "intended for a truck or bus" (sorry I don't know the correct backed up by documentation to prove it term) often found at the truck dealer's parts dept. or a reputable commercial vehicle aftermarket source.  

Crawling under this truck every day is not something I'll ever be doing. I have never found the air dryer, and according to my mfr, there isn't one.  I'll keep looking.

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If you do not have air brakes your truck may not have an air dryer.  If it had one you would hear it discharging contaminants when the compressor cycles off.  

If there is no dryer fairly frequent pulling of the drain lanyards when you are doing your pre trip walk around with the engine running is a good habit. 

 

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7 hours ago, hemsteadc said:

I don't even have those.  I have to crawl under the truck.

I posted a link for valves with lanyards on Amazon for $13 each.   If I was camped near you we could install them in minutes. 

My son has a saying on his ranch when we are doing something the hard way: "Pa, it's because we enjoy the struggle..." 🤣

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