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Engine Discussion of preventative/corrective maintenance and other technical issues regarding your coach's engine.

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  #1  
Old 11-20-2010
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G_man G_man is offline
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Default Engine Air Comp. only makes 75psi

Started the bus today (50 degrees outside temp.) and it would not make air above about 75 psi. I found that the pressure releif valve on the engine compressor is opening at 75 psi.

Since it is not getting anywhere near operating pressure is the pressure releif valve bad or could there be another problem causing the releif valve to open. All was fine when I shut down two weeks ago.

Thanks.
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Old 11-20-2010
Robert Britton Robert Britton is online now
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Sounds like the governor Rich…is it a D-2?

http://velvac.thomasnet.com/viewitem...nor-d-2-style-
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  #3  
Old 11-20-2010
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Governor seems "OK" When pressure reaches only about 75 psi the pressure releif valve opens and bleeds off air. Governor is still calling for air as it should be. It never reaches anywhere near the 120 psi cut out point.

Cat C13 550hp 2006.



Photo shows pressure relief valve at left side of photo about 1/2 way down. (Governor removed for access mounts to gasket visible in photo.)
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Old 11-21-2010
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tap on it

they sometimes stick
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  #5  
Old 11-24-2010
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Problem solved.

As expected it was a bad pressure relief valve opening at 75 psi. Standard Bendix part (#801116). 5 minute fix, $40.00, Whew!!
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  #6  
Old 11-24-2010
Robert Britton Robert Britton is online now
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Glad it was such an easy fix Rich…
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Marathon XL40
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  #7  
Old 11-24-2010
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too easy

we got the power here with lots of knowledge and xperance!!!!!
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2003 LX Single Slide Hauling Wood 5
2 miles east from Texas Highway 37-97
Just a Hobby Shop now-Bird Repairs upon Appt and my Schedule -USAR Retired
Pleasanton Tx 78064
Do not use PM... please use
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http://www.ebay.com/usr/woody19571

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