Username:

Message:

<p>[QUOTE=&quot;dberset, post: 12380902, member: 292411&quot;]2016 Coronado glider, 12.7 Detroit series 60, bendix truflo 550 compressor.</p><p>This has been a persistent problem for a couple years now. Late last fall I decided to finally dig in to correct it. I was hearing an intermittent whistling noise but had no clue where it was coming from.</p><p>I thought it might be a boost leak so I cleaned boost hose connections and used new clamps And&nbsp; checked CAC for Leaks, No luck.</p><p>&nbsp;One day I realized driving across Texas that it only whistles under load, moderate boost, at just below 100psi on my air gauges(cut in pressure), and air pressure will not rise while whistling.</p><p>If you lift your foot and let the boost fall it will stop whistling and start building pressure. That definitely led me to the safety valve.</p><p>&nbsp;I stopped at freightliner and bought a new valve but still had the problem. I also used a solid plug temporarily In place of the valve to make sure it was the valve and it did not whistle.</p><p>&nbsp;Replaced governor. No luck.</p><p>Then replaced the discharge hose believing I’m dealing with a restriction. No luck.</p><p>&nbsp;Then onto the dryer. No luck.</p><p>The day after Christmas, I spun the rear main bearing(-24f) and have since replaced the engine with a complete reman which included a new/rebuilt compressor and governor so those are totally eliminated.</p><p><br /></p><p>As of Today, that’s as far as I’ve gotten with it with the check valve being the next possible(maybe) restriction in line.</p><p>&nbsp;Is it possible for the check valve/s to be restricted? The old compressor with 833k on it did pass a little oil so could the check valve/s be coked up from oil?</p><p>Also there is plenty of air pressure coming from the tank line at the governor and I blew shop air through the line from the governor to dryer with no problem.</p><p>&nbsp;I’ve called a couple of shops and nobody has ever encountered anything like this.</p><p>&nbsp;Am I heading in the right direction as far as a restriction or not?</p><p>Operation of the truck isn’t a problem, I still have plenty of air pressure but I know the safety valve should not be leaking.[/QUOTE]</p><p><br /></p>

Your username or email address:

Do you already have an account?

• No, create an account now.
• Yes, my password is:
• Forgot your password?