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Old 10-07-2021, 11:03 AM   #1
Bus Nut
 
Join Date: May 2017
Location: Houston TX
Posts: 502
Year: 1998
Coachwork: Amtran
Chassis: International
Engine: dt466e
Anyone know what this is?

I cleaned it by using super clean. Hope that'll be alright. Don't know if it'll make a difference
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Old 10-07-2021, 11:31 AM   #2
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Join Date: May 2006
Location: mid Mo.
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Year: 1976
Coachwork: bluebird
Chassis: F33695
Engine: 427 chevy converted to 466
Rated Cap: 84
brake valve, don't all those hoses go to brake chambers?
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Old 10-07-2021, 11:31 AM   #3
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looks like an encrusted air dryer. to get that way it probably has been dripping oil through the relief valve. that's the part not encrusted. I would be concerned about your compressor needing a rebuild, since that is the likely source of the oil. Keep in mind that is engine oil coming out. Post a picture post cleaning.
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Old 10-07-2021, 10:25 PM   #4
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Join Date: May 2017
Location: Houston TX
Posts: 502
Year: 1998
Coachwork: Amtran
Chassis: International
Engine: dt466e
Quote:
Originally Posted by flattracker View Post
looks like an encrusted air dryer. to get that way it probably has been dripping oil through the relief valve. that's the part not encrusted. I would be concerned about your compressor needing a rebuild, since that is the likely source of the oil. Keep in mind that is engine oil coming out. Post a picture post cleaning.
It's in the back right above where the last driveshaft connects to the pumpkin yoke. The air dryer is way towards the front near the compressor or inside it or insidesomething, right? I might be rong. Here's a pic of it after cleaning.

EDIT: It's pretty small, BTW
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Old 10-10-2021, 11:21 AM   #5
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Join Date: Oct 2021
Location: Peru. IN
Posts: 21
Year: 1992
Coachwork: Collins
Chassis: NB18FD Oshkosh
Engine: 5.9 Cummins
Rated Cap: 18,500
Air brake quick release valve.

As much crud as you removed. The air compressor is passing oil. If you don't have a air dryer. I would install one.
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Old 10-10-2021, 02:32 PM   #6
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Join Date: Oct 2016
Location: Pensacola and Crystal River, FL
Posts: 647
Year: 1998
Coachwork: AmTran International
Chassis: 3800
Engine: Navistar 7.6L
Quote:
Originally Posted by PhilipE View Post
Air brake quick release valve.

As much crud as you removed. The air compressor is passing oil. If you don't have a air dryer. I would install one.
Why install an air dryer to fix a worn out air compressor passing oil?

He posted it is directly above the rear axle u joint that was also covered with oil and dirt.
But I would agree as the background would also be covered the same if the pinion seal was slinging oil.
That valve is probably how and why the front of the pumpkin was encrusted.

To the O.P.
Go look at the same dump valve for the front brakes Look up behind the front bumper at the bottom of first cross member of the frame.
If that one is encrusted like the other, your compressor is doing what Phillip says above
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Old 10-11-2021, 09:01 AM   #7
Mini-Skoolie
 
Join Date: Oct 2021
Location: Peru. IN
Posts: 21
Year: 1992
Coachwork: Collins
Chassis: NB18FD Oshkosh
Engine: 5.9 Cummins
Rated Cap: 18,500
Quote:
Originally Posted by DoubleO7 View Post
Why install an air dryer to fix a worn out air compressor passing oil?
If you look at his location. He is in TX. That means high temps and high humidity for a large part of the year. High humidity means water in the air system. Water causes more problems in a air system than engine oil from a bad compressor. But yes you are right the compressor does need changed out. The addition of a air dryer will stop oil and water problems.

You mentioned a seal needing replaced. A seal leaves a splatter pattern. The splatter pattern is narrow and in a straight line. That pic does not show a splatter pattern that a bad seal would produce. All the built up oil is on one valve. Nothing on the metal its mounted to. That release valve vents down towards the camera.

The front valve might not show the same oil build up. Oil is like water it takes the least path of resistence. If its easyer to get to the rear valve. It goes there.
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