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Rear DS Ride Height Valve Exhaust Port Slow Leak
Stumped once again… Today, I replaced my Driver Side 5 port three way Norgren AND the Driver Side 3 port two way Norgren because I SOMETIMES would get a very slight case of the leans to the driver side.
The “old” valves were original so believed it was worth the try as thought the old 2006 valves might have crud in them making them “stick” slightly open.
Here is the stumped part. The driver side rear ride height valve exhaust port leaked VERY slightly before I installed the new Norgren valves today, and it continues to have a very slight leak after the new Norgrens were installed today.
When the engine is off, where does the exhausting air come from in the driver side rear ride height valve exhaust port? Is the ride height valve defective or is it possibly the five port three way Norgren on the other side to which it is also connected? Here are a couple of screen shots from my 2006 Prevost air diagram. Thank you, Jeff
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6 Replies
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As I think more about it, my inexperienced mind thinks the leaking exhaust port on the ride height valve is NOT related to my occasional leans as my bus had been lean-free for more than a week with both primary and secondary tanks holding full. My accessory tank does drain completely after about 24 or so hours. ****After visually inspecting all ports on the two old Norgren valves, no foreign debris, corrosion, etc was visible.
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The amount of air pressure in the tanks has no impact on the leans of later vintage coaches (sometime after mid 90’s).
You can have all tanks full or all tanks empty and the coach will either lean or not depending on the integrity of the suspension air bags, valves, Norgrens, fittings, etc.
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Thank you Jon. Was just wondering if anyone might know from where that air was coming from since my tanks were not leaking down (source was not primary or secondary tank)
After reading your reply, I just went out drained the aux air tank and it is not leaking when it is empty, but immediately thereafter refilled aux air tank again, and now not leaking either. I’m guessing something is either not fully closing or opening. Have run out of ideas of what to check.
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if it (level low valve) is bubbling it is leaking. Those valves are the least expensive thing in system.
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Jeff, I’m looking at my suspension virtual pdf schematic, at it appears the leak at the ride height valve could be coming from/thru either of the two rear 5 port/3 way Norgrens. The air source is the air bags on the side of the leaky 5 way/3 port.
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The thing to remember is on later model coaches, when the key is off the 5 port Norgrens stop all air flow, into or out of the air bags regardless of whether the air is coming from the ride height valve or from the level low side of things.
The five port Norgren needs to be considered the traffic cop that stops the flow, or allows it to come from the level low controlled flow or the ride height valve.
With the key off if air is escaping via the ride height valve it is coming from the accessory tank or air is leaking past the 5 port Norgren from the air bags.
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