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chamber :confused: Was'nt replacing these a bit dangerous?

I see the blue spring of death.

It actually looked like O ring lube and possibly something red? I believe that these got lubed by techs when they stuck. Just a hunch. I have figured out why the valves with vents go bad. The thin plastic flapper valve distorts with time and heat and stays open and allows dirt to enter the...

In regard to picture 2015-05-28 20.04.25.jpg Attachment 562135, Does the pointed portion of the rubber valve goes towards the metal portion of the valve (with the sunburst cut) or toward the black plastic cap portion ?

I found some sort of lubrication in my tractor valve, did you? Did you use any lubrication? Me thinks someone went under truck and injected something in the exhaust port to free it.