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Old 07-29-2021, 07:43 PM   #1
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Compressor and boost Problem

I own a 2014 Winnebago Journey with a Cummins ISB 360 engine in a Freightliner Maxium Chassis. I have had a recurring problem with the air compressor air supply line which feeds pressurized air from the Charge Air Cooler to the compressor. The line is a three piece line. the first section is rubber from the CAC to the engine where it transitions to a steel tube. The steel tube is clamped to the engine as it runs forward to the compressor. Then it transitions to a rubber 90 degree rubber elbow which attaches to the compressor. The problem is this. I have had four failures of the rubber elbows and broken clamps and stand offs in 90K miles. I always know when the failure occurs as the engine boost drops. I believe the clamp failures are from a combination of engine vibration and the fact that the CAC and engine don't move as a unit which causes flexing. I am looking for any recommendations on solving this. getting tired of replacing elbows and clamps.

Thank you
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Old 07-30-2021, 09:22 AM   #2
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Usually metal tubes are rigid and affixed to things that don’t move. Rubber lines are used on either end of a metal tube as the go between connection between the rigidified metal line and things that move, like engines or engine mounted compressors.

If the wrong type of hose is used, or if the hose is shortened during fitting replacement, especially hydraulic type hoses, then they get stiffer and more rigid. Between the transmitted vibration and the movement of what ever the hose is connected to, there is a lot of stress put on any and all fittings of the hose or the rigid metal lines and associated fittings the “flexible” rubber line is connected.

I would take a look at your flexible line lengths and make sure your using the most flexible rubber line rated for the pressure of your system. If possible, make the line longer do you can put a loop in it - but you don’t want the loop tight or it will transmit vibration (vibration is what is causing your issue in the first place).
Maybe look art a different set of fittings at each end of the rigid metal line that would insure the rubber line can minimize transmission of vibration.
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Old 07-30-2021, 09:45 AM   #3
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Since its a hose on both ends, maybe check with a hydraulic hose shop for a more robust hose, long enough to reach both points.

Marine stores also carry all sorts of tough hoses and clamps.
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Old 07-30-2021, 01:43 PM   #4
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Thank you for the response. I will look in to the things you mentioned.
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Old 07-30-2021, 01:50 PM   #5
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thank you for the information.
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Old 07-30-2021, 05:58 PM   #6
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Your compressor is the turbo driven by the exhaust pressure. If you are having disconnect issues of the various components in the tubing either look at double clamping each connection and or look into whether the CAC itself is clogged causing the disconnects.
If the section between the turbo and CAC is where your problems are look into a potential blockage of the CAC.
Good luck
Bob
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