RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Freightliner Motorhome Chassis Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
 
Thread Tools Search this Thread Display Modes
 
Old 08-16-2019, 08:07 AM   #1
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2012
Posts: 188
Air System Leakage

A while ago I posted a thread regarding system air loss (lose some pressure overnite), and thought it may be related to the air dryer. Well, replaced the dryer with no improvement. Recently was underneath air tanks and found leakage from the blowdown valves. Freightliner suggested spraying WD 40 up into valves to see if it would clear any debris that may be in valve. Tried once and seemed to reduce leakage rate - will do again and see if that's the answer (easier than replacing valves)

Skip Y
2010 Journey 40TD
Freightliner Maxuum, Cummins ISC
WIT 47083, FMCA F263635
__________________

Skip Y is offline   Reply With Quote
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!

Old 08-16-2019, 08:49 AM   #2
Senior Member
 
Join Date: Jul 2014
Posts: 18,616
The air dryer is not under pressure with the engine off.
Once it purges, it and the lines coming from the compressor are no longer holding pressure.
There is a series of check valve after the dryer that holds back system pressure between the 3 tanks.
__________________

twinboat is online now   Reply With Quote
Old 08-16-2019, 11:10 AM   #3
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2012
Posts: 188
EEKS, let me clarify - the blowdown valves that are leaking are from the bottom of the 2 main air tanks. These are the 3 valves connected to the lanyards that we are supposed to pull every so often.

Skip Y
2010 Journey 40TD
WIT 47083, FMCA F263635
Skip Y is offline   Reply With Quote
Old 08-19-2019, 08:34 AM   #4
Senior Member
 
Join Date: Jun 2016
Location: Nine Mile Falls WA / Arizona City AZ
Posts: 953
replace the valves... Find a local Fleet Pride store, or a NAPA HD parts store and you can find these valves on the shelf... Fleet Pride also has a on line store PDC that can help...
The key here... is that the inside of the tank will dump scale into the system... by removing the valve and running the compressor for 5 minutes will help blow out the loose pieces....

Hope this helps...
__________________
Retired Business Owner, Re-manufacturing HD Clutches, Brake Shoes, Air Compressors, Sales & Installation of PacBrake and other Industrial Friction
jelag is offline   Reply With Quote
Old 08-22-2019, 07:51 AM   #5
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2012
Posts: 188
Thanks, jelag. Sounds like you've already replaced the valves. replacing makes sense, doesn't sound like a tuff job. Does sound like a job that will have to be repeated occasionally.

Skip Y
2010 Journey 40TD
WIT 47083, FMCA F263635
Skip Y is offline   Reply With Quote
Old 09-11-2019, 08:06 AM   #6
Senior Member
 
Winnebago Owners Club
Join Date: Aug 2012
Posts: 188
Just a quick follow-up. Thanks to Jelag's suggestion to blow the crud out, I soaked the valves with WD for a while, then aired-up the coach and blew each valve for a few moments, shifting the lever as I pushed it to clean out as much contact surface as possible (pushed valves directly rather than use the lanyards). The coach then had 55# pressure after 2-1/2 weeks. Not perfect, but much better than 0# after 2 days. Soaked them again and blew down again, and did not feel any air leakage. Will see how much good this does.

Skip Y
Skip Y is offline   Reply With Quote
Old 09-11-2019, 09:52 AM   #7
Senior Member
 
FIRE UP's Avatar


 
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 7,780
Hmmmmm,
I'm gonna have to take a look at my "blow down" valves. (actually never heard them called that before). Ours can be parked with 120 in the system and, 24 hours later, maybe 60, maybe less. I've sprayed as many of the fittings and valves as I can see or find and, well, no leaks in any of them. But, it does seem to leak faster if it's not on the jacks. If I level it which means bags dumped and jacks are supporting the motorhome, it takes quite a bit longer, as in 2-3 days to get down to 60 after leveling it.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
FIRE UP is offline   Reply With Quote
Old 09-11-2019, 10:53 AM   #8
Senior Member
 
Jon_C's Avatar
 
Join Date: Jul 2018
Location: Southeast Texas
Posts: 438
Scott my airbags were leaking id spray some soap solution on them especially where rubber makes the 180 bend. Taking the load off them seems like theyd leak slower as u describe too.
__________________
1998 HR Endeavor Cummins ISB 275 / Banks Allison 3060
2008 Jeep Wrangler with M&G air brake with breakaway
2015 Haulmark Edge Race Trailer 4 wheel electric brakes
Jon_C is offline   Reply With Quote
Old 09-11-2019, 07:44 PM   #9
Senior Member
 
FIRE UP's Avatar


 
Join Date: Dec 2009
Location: Out there, somewhere
Posts: 7,780
Quote:
Originally Posted by Jon_C View Post
Scott my airbags were leaking id spray some soap solution on them especially where rubber makes the 180 bend. Taking the load off them seems like theyd leak slower as u describe too.
Jon_C,
Yeah, I'm gonna have to slither under the big girl and spray some soapy solution around those bags. But, one of the other posters says the air dryer does not have pressure on it when the engine is not running and or, when the compressor has finished its cycle. Well, mine does. I have Schrader valve on the lower part of mine and, it has a slight amount of air coming from it. I keep a cap on it but, I'm still getting some seepage from it.
Scott
__________________
2004 ITASCA HORIZON 36GD, 2011 GMC Sierra 1500 4x4 Toad '08 GL 1800 Gold Wing
Retired-29.5 yrs, SDFD, Ham - KI6OND
Me, Karla and the Sophie character, (mini Schnauzer)
FIRE UP is offline   Reply With Quote
Old Today, 12:39 PM   #10
Junior Member
 
Join Date: Aug 2019
Location: Land of high fuel prices and poor roads; Kalifornia
Posts: 23
About how long should my air pressure stay?


I think mine are close to zero PSI after 24 hours.
__________________

__________________
On our Nth motorhome. Currently: 2007 Winnebago Journey 34H Diesel Pusher
dmevis is offline   Reply With Quote
Reply

Tags
air, leak



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Air Leakage LBZYA Outdoors RV Owner's Forum 3 07-29-2016 10:41 PM
Found Cold Air Leakage jcrowder47 Tiffin Owner's Forum 0 04-10-2014 08:16 PM
Air Leakage, Suggestions??? sgtjoe National RV Owner's Forum 5 09-07-2012 04:18 PM
Air Valve Leakage slabman Spartan Motorhome Chassis Forum 1 09-02-2009 09:11 AM
Electrical leakage Duncan RV Systems & Appliances 8 03-08-2006 10:31 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 10:45 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.