|
12-01-2014, 07:24 AM
|
#1
|
Senior Member
Monaco Owners Club Fleetwood Owners Club
Join Date: Mar 2009
Posts: 446
|
Air Compressor building air slower
When the air compressor fails, is it an open and shut case, or can it fail a little at a time? Mine has started to take longer to rebuild the air supply after going to ride height, or starting with tanks low, a lot of braking while parking. I have not yet been able to locate a leak that would be of the magnitude that would slow the rebuilding of the air. Are there any other devices that would allow the pressure to rebuild slowly. We have about 76k miles on the rig. I do have a couple of very small leaks that just barely bubble, but nothing of a larger nature. Thanks for your help or advise in advance. Happy Trails Bert
__________________
2006 Monaco Dynasty Diamond IV 42' Tag, ISL 400, Residential Refrig, 10KW Onan, Bosch Washer/220V Dryer (previously 2003 American Tradition 40W)
|
|
|
|
Join the #1 RV Forum Today - It's Totally Free!
iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!
You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!
|
12-01-2014, 08:56 AM
|
#2
|
Senior Member
Join Date: Aug 2002
Location: Where ever I park it
Posts: 1,345
|
About the only place I can think of where a leak of that size could hide is in the air dryer. Generally if the compressor has enough wear to slow the capacity there should be a lot of oil in the dryer and first air tank. It would be a creamy color and be somewhat thick and not smell good.
__________________
2005 Dodge Ram Four Door Dually Southern Comfort Conversion
2017 Forest River 365RK
|
|
|
12-01-2014, 09:52 PM
|
#3
|
Senior Member
Join Date: May 2011
Posts: 459
|
The compressor draws it's air from the intake manifold, check the hose that connects them, have heard of the hose collapsing. The other problem, would be the compressor governor. I had to replace mine at about the same mileage that you have on your unit.
__________________
'05 Monaco Beaver 400 Quad SLD 400hp C-9 Caterpillar
2014 Grand Cherokee, Limited, diesel
Katie-Doberman Pinscher, Tigger, yellow Tabbycat.
|
|
|
12-02-2014, 06:05 AM
|
#4
|
Senior Member
Monaco Owners Club Fleetwood Owners Club
Join Date: Mar 2009
Posts: 446
|
Thanks both for your comments, going to do some more investigating today, also will replace the governor, thought of that right away, but assumed it was an on/off thing and would probably not make it build slowly. Will also check the air intake hose, if I can follow it up into the jungle. On the dryer, I will inspect the air dump closer for leaking, is there anything internal that can plug to cause a restriction? thanks again for your help. Have a great day. Happy Trails Bert
__________________
2006 Monaco Dynasty Diamond IV 42' Tag, ISL 400, Residential Refrig, 10KW Onan, Bosch Washer/220V Dryer (previously 2003 American Tradition 40W)
|
|
|
12-02-2014, 06:14 AM
|
#5
|
Senior Member
Join Date: Jul 2014
Posts: 35,415
|
I have found loose and cracked fittings, along with leaks in the pipes leading away from the compressor discharge. They only leak when the engine is running and very hard to hear. Check the pipes near any of the clamps that hold it, they sometimes chafe, creating a pin hole leak.
Also feel under the air dryer for a leak, while it is running and building pressure. If the unloader valve is gummed up, some air will leak out there.
Remember, until the first check valve in the system ( Air Dryer or Wet Tank ), the only time the compressor line will leak is when the engine is running.
In 40 years of fixing this stuff, I recall 3 compressor failures, 2 on Cat engines, where the drive spline stripped and one on a Mack truck that had a un-reported leak causing the compressor to cycle every 30 to 40 seconds. On that one, the air dryer was spitting out engine oil, from the compressor. By the time I got the repair, there was oil spitting out all of the air valves, including the parking brake dash switch. The driver wrote it up for oil on the cab floor.
One other place to check is where the compressor discharge line, first connects to the rest of the plumbing, sometimes there can be a build up of carbon blocking the first fitting. The compressed air is hot, coming out of the compressor and a little oil does cook on to the inside of the fitting.
I would not start throwing parts at this issue, until I was sure what's wrong.
Good Luck
|
|
|
12-02-2014, 06:18 AM
|
#6
|
Senior Member
Join Date: Nov 2005
Posts: 7,400
|
Besides the governor on the compressor, there is a "rotory" valve near/above the rear axle area on many coaches that sorts out the air pressure needs between the the reserve tank[s], and the air bags. This device can also be a source of leaks....
__________________
Old Scout
2015 IH45 Foretravel
2003 Alpine 40' MDTS [Sold]
New Braunfels, Texas
|
|
|
12-02-2014, 07:45 AM
|
#7
|
Senior Member
Winnebago Owners Club
Join Date: Jun 2013
Location: Full-timer/volunteer w/SOWERS
Posts: 3,958
|
Quote:
Originally Posted by Jobert
When the air compressor fails, is it an open and shut case, or can it fail a little at a time? Mine has started to take longer to rebuild the air supply after going to ride height, or starting with tanks low, a lot of braking while parking. I have not yet been able to locate a leak that would be of the magnitude that would slow the rebuilding of the air. Are there any other devices that would allow the pressure to rebuild slowly. We have about 76k miles on the rig. I do have a couple of very small leaks that just barely bubble, but nothing of a larger nature. Thanks for your help or advise in advance. Happy Trails Bert
|
When was the last time you had the air dryer serviced?
__________________
Rick & Melissa Young, 2011 Itasca Meridian 40U, Frtliner XCL, Cummins ISL 380HP/DEF, Allison 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox, EEZ TPMS, TruCenter steering control
Servants On Wheels Ever Ready. Best job we ever paid to do . (full time volunteers)
|
|
|
12-02-2014, 07:24 PM
|
#8
|
Senior Member
Monaco Owners Club Fleetwood Owners Club
Join Date: Mar 2009
Posts: 446
|
I'M BACK. Thanks so much for all the advise and suggestions. They all helped and the problem has hopefully been solved. I crawled under the coach today with it running and not in park (tires blocked well) with a squirt bottle and went after it. By accident while moving, I found the leak. It was a place where the hose was held in a clamp and had chaffed a hole through the steel wrap and there was a hole half the size of a pencil lead leaking. The old hose was very clean inside, which made things a little better. Replaced the hose tonight and will start it in the morning but all should be well. I also found that the air dryer had not been serviced as the dealer told me so will have to do that also. I had looked at it once and it looked like it had been changed, but had not. Thanks again to all for the suggestions, they were all good and I was starting down the list. You all are the greatest. Have a great day Happy Trails Bert
__________________
2006 Monaco Dynasty Diamond IV 42' Tag, ISL 400, Residential Refrig, 10KW Onan, Bosch Washer/220V Dryer (previously 2003 American Tradition 40W)
|
|
|
12-02-2014, 09:20 PM
|
#9
|
Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,897
|
Jobert, may I recommend buying the entire air dryer "kit" instead of only the desiccant dryer/filter. The associated valves in the air dryer body get gunked-up and should be rebuilt per air dryer maintenance schedule. I bought the filter only, changed it and discovered oil N water was clogging the spitter valve enough to leak air pressure.
__________________
2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
|
|
|
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
|
|
Thread Tools |
Search this Thread |
|
|
Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
|
» Recent Discussions |
|
|
|
|
|
|
|
|
|
|
|
|
|