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Old 01-31-2016, 04:04 PM   #15
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Twinboat
I think we are talking two separate scenarios here. Your last post was a static check ie engine off, parking brake off.
The problem stated in my original post was a 2-2/12 minute cycle WHILE THE ENGINE WAS RUNNING. The fix turned out to be an air control valve located on the turbo, something to do with controlling the waste gate. The valve did not leak when the engine was not running but started to leak with the engine running.
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Old 01-31-2016, 04:13 PM   #16
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Quote:
Originally Posted by jerry davis View Post
Twinboat
I think we are talking two separate scenarios here. Your last post was a static check ie engine off, parking brake off.
The problem stated in my original post was a 2-2/12 minute cycle WHILE THE ENGINE WAS RUNNING. The fix turned out to be an air control valve located on the turbo, something to do with controlling the waste gate. The valve did not leak when the engine was not running but started to leak with the engine running.
I was responding to the post from Dennismhamm.
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Old 01-31-2016, 04:16 PM   #17
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Quote:
Originally Posted by jerry davis View Post
Twinboat
I think we are talking two separate scenarios here. Your last post was a static check ie engine off, parking brake off.
The problem stated in my original post was a 2-2/12 minute cycle WHILE THE ENGINE WAS RUNNING. The fix turned out to be an air control valve located on the turbo, something to do with controlling the waste gate. The valve did not leak when the engine was not running but started to leak with the engine running.
Interesting, wonder what it was they replaced? The waste gate is controlled by a vacuum operated valve/lever with a diaphragm in it operated by boost pressure.........and its function is to relieve the engine of high/excessive boost pressure, as far as I know, this should not affect the chassis air system/pressure when running.......
Maybe I am missing something?
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Old 01-31-2016, 04:24 PM   #18
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Interesting, wonder what it was they replaced? The waste gate is controlled by a vacuum operated valve/lever with a diaphragm in it operated by boost pressure.........and its function is to relieve the engine of high/excessive boost pressure, as far as I know, this should not affect the chassis air system/pressure when running.......
Maybe I am missing something?
This a picture of what ever it is.
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Old 01-31-2016, 04:55 PM   #19
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This a picture of what ever it is.
And I thought I was going to make it through the day without learning something

Thanks Twinboat
What the hell is that thing Does it control the turbos boost and has supplied air to it?
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Old 01-31-2016, 05:17 PM   #20
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Here are pictures of the replaced valve. And a site that gives a brief description of what it does

Cummins Heavy Duty Air Control Valve - Advantage Truck Center
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