Hey guys, we have a 25' front engine Bluebird transit bus. Love it to death!
We had very frigid temps in the north east for approximately a 3 week period. Then the temperatures randomly jumped to nearly the 70s for a couple days.
I took this opportunity to start the bus and move it around to check everything out. It's been sitting in our driveway for about 3 months without being started while we worked on the interior.
The bus started up without hesitation and ran great! I immediately noticed the sound of a large air leak, large enough where the compressor struggled to keep up. I traced the leak to this valve(see attached pic). I wanted to show this valve to some of the wizards on this awesome forum who may know what this is. Bus never had this before. Yay for surprises. Per the gauges, this valve appears to be tied to the front air tank. The rear tank fills to about 115-120psi. The front struggles to get past 100. Previously both would hit 120psi quickly before the cutout.
To me, the newbie, this valve looks like a bleeder or relief valve. In the slit, there is a small hole where the air is released with a decent amount of pressure. It is also threaded suggesting I can adjust or close it. That said, I'd rater get some insight before I start touching things I don't yet understand.
I've built cars and and love the automotive world but diesels and air brakes are a new experience for me
Thoughts? Thanks everyone!