M923A2 air leak at air tank pressure protection valve

[Ford Mechanic]

Hey guys, I know this info is in the parts TM, but I don't have a computer at home at the moment, just my phone. Anyway it's been extremely cold here the last week, 8* F! One night and barely got above freezing one day. I started my truck tonight and went to move another off the driveway, I started hearing it pop off with a weird sound and looked and the air pressures were pegging the guages! So I assume the governer is stuck and if I recall correctly it's part of the dryer assembly. I cracked one of the tank drains to get the pressures down so I could move it. After I shut it down I found a air leak at one of the air tanks. I took a pic of it if ya'll could tell me what it is. And if it's one of those that will self correct with higher temps?

 

[Ford Mechanic]

Pic....

 

[doghead]

Your problem sounds like many others with a frozen pressure protection valve.

I would wait for warm weather and look it over.

When the ppv is frozen, the pressure relief(safety) blows off.

 

[juanprado]

That is the pressure protection valve. Some other members have posted threads on them icing up and sticking due to moisture in cold weather. I don't recall the exact thread but search it out.

 

[Suprman]

Heat it with a heat gun or hair dryer.

 

[Ford Mechanic]

Ahh, so that's the ppv. It's supposed to jump to 50*F tomarrow so it should thaw out. This weather is uncharacteristically cold for us. 25* is normally the coldest for the winter here, this week we've gotten a inch of ice! I've been chasing air leaks and stuck valves on most of the trucks at work.

She did fire off rather quickly for a 2 week layup. I need her tomarrow at the auction to pull dumb people out. Here winter is known as the season of mud. Much fun. .....

 

[Ford Mechanic]

I can't seem to be able to edit the title??

 

[doghead]

What would you like it changed to?

 

[Ford Mechanic]

Just add pressure protection valve added at the end. Might make someone else's searching easier.

 

[Ford Mechanic]

Just to follow up, the ambient temps climbed to 55* F today! Yeaaaaa, all the snow's gone! My over pressure issue and air leak at the pressure protection valve have both resolved themselfs without any action.

 

[Suprman]

Good. You have moisture in your air system you need to service your air dryer and make sure you drain the air tanks daily.

 

[Ford Mechanic]

New air dryer is on the short list, draining the air tanks I do all the time but never get any water out. I reckon it's about the moisture in the air though.

 

[Suprman]

The air dryer has a coalescing filter element that works to dry the air then purge it out the bottom valve. The filter needs to be replaced yearly.