Air leak

Topic: Air leak (Read 1530 times) previous topic - next topic

Air leak

March 28, 2019, 03:18:36 pm

I have a pretty quick air leak I believe is coming from a solenoid behind right rear tires but not sure what the part is called or where to get replacement. It's about the size of my fist and can be seen from the hatch directly behind the right rear tires...supposed to pick up coach tonight for purchase and he just called me and notified me about it. Any advice would be greatly appreciated

Re: Air leak

Reply #1 – March 28, 2019, 03:22:24 pm

Post a pic plz.. My imagination isnt that good.. Older I get it takes sign language with words but a thump on my head first to make sure you have my attention

Re: Air leak

Reply #2 – March 28, 2019, 03:45:40 pm

So I can't figure how to add photo lol but the gentleman I'm talking to is digging and says it looks like the HWH air dump valve but he isn't sure and he unfortunately doesn't have smart phone and I'm two hour drive from him

Re: Air leak

Reply #3 – March 28, 2019, 03:53:35 pm

Does it look like this?
Mike
http://www.foreforums.com/index.php?action=dlattach;topic=12708.0;attach=3585

Re: Air leak

Reply #4 – March 28, 2019, 04:14:26 pm

I have a picture how do I add it?

Re: Air leak

Reply #5 – March 28, 2019, 04:18:30 pm

These are the pictures of the leaking valve

Re: Air leak

Reply #6 – March 28, 2019, 04:21:55 pm

That is the new style retarder control unit. Most likely full of dirt/mud dauber nest. There is a DIY here as to how to clean the older style but not that one. You should be able to just plug that line that feeds it and go on, BUT you won't have the retarder that will work.

That has nothing to do with the ride height or HWH system.

When I get back from a school function I will look up the DIY on how to clean on of those and post a link. (unless some one else beats me to it, Chuck) With that info you may be able to figure out how to clean that one.

Mike

Re: Air leak

Reply #7 – March 28, 2019, 04:22:23 pm

Air control for retarder.

Re: Air leak

Reply #8 – March 28, 2019, 04:24:40 pm

Y'all are awesome...hopefully not a show stopper for purchase...not sure how much one cost or where to get one

Re: Air leak

Reply #9 – March 28, 2019, 04:26:06 pm

And would that allow all air to deplete from air systems

Re: Air leak

Reply #10 – March 28, 2019, 04:26:34 pm

Threads about the retarder solenoid valve - hopefully some helpful info therein:

Replacing transmission retarder valve

Replacing transmission retarder valve (split from What did you do to your coach)

Big Air Leak Hydraulic Accumulator

Re: Air leak

Reply #11 – March 28, 2019, 04:32:50 pm

The one I was going to link is the one that I did with pics.
Got to run

Mike

Re: Air leak

Reply #12 – March 28, 2019, 05:05:07 pm

Quick Google search for replacement solenoid valve only turned up two possible hits. Part numbers I searched:

Allison 29522717 (original valve part number mentioned in the links in my post above)

Allison Genuine Parts Retarder Accumulator Solenoid Valve p/n 29522717 | eBay

Allison 29547934 (supersedes part number above)

Allison 29552377 (supersedes part number above)

Found this listing, but 29557354 should be verified by Allison dealer as a good replacement part number:

FinditParts.com

Re: Air leak

Reply #13 – March 28, 2019, 07:35:01 pm

FOT has them. About $500.

Rich

Re: Air leak

Reply #14 – March 28, 2019, 09:02:17 pm

Here is the post that I was looking for that shows how to clean up the inside.
Allison retarder air valve
Mike

Re: Air leak

Reply #15 – March 29, 2019, 06:33:19 am

Well I got to the unit and found no air leak and also it was building great pressure and it was holding well. But once I started to pull out leaving with my new MH it would not build air pressure which is weird as it just had wired perfect an hour earlier...so now of course I'm a little frustrated...as if it just quick making air :/ maybe from my little bit of searching the Governor?

Re: Air leak

Reply #16 – March 29, 2019, 06:41:16 am

Could be the governor. Tighten=n it down then release it and you might be able to get home but a d2 at set at either 95 or 105 is what you want and they are pretty inexpensive. I carried one as a precaution when my unit got older.

Re: Air leak

Reply #17 – March 29, 2019, 07:27:37 am

Hmm now to find the part number for this governor or are they all pretty standard

Re: Air leak

Reply #18 – March 29, 2019, 07:46:04 am

Quote from: Flatfisher53 – March 29, 2019, 07:27:37 am

Hmm now to find the part number for this governor or are they all pretty standard

Yes,
They do have different factory set points (which causes different part numbers) but most are a standard. Any truck shop will have a box full under the parts counter. About $20 and you are out the door.

Mike

Re: Air leak

Reply #19 – March 29, 2019, 08:10:28 am

Quote from: Flatfisher53 – March 29, 2019, 07:27:37 am

Hmm now to find the part number for this governor or are they all pretty standard

Here's some info on the D2 so you will know what you are looking for (in the engine compartment, and at the parts counter):

Haldex D2 Governor Service Data

Re: Air leak

Reply #20 – March 29, 2019, 08:10:58 am

Flat,

I'm on the road so it took a little time to find this, look on page 13 for all the D2 governor info you need as far as pressure and part numbers.
https://www.bendix.com/media/documents/products_1/compressorsgovernors_1/quickrefguide.pdf

Mike

Re: Air leak

Reply #21 – March 29, 2019, 08:34:26 am

Thanks I grabbed one from Napa and on my way to swap it out I just hope that's the issue

Re: Air leak

Reply #22 – March 29, 2019, 09:20:22 am

Before you swap it out, you might want to take a look at the bottom of the air dryer and see if the air is coming out of the purge valve. Since it was building air a short time ago after you first noticed a big leak previously, the purge valve may be hanging open. If so, a tap on the bottom of the air dryer next to it might free it up.
Don

Re: Air leak

Reply #23 – March 29, 2019, 10:12:02 am

While you have the D2 off, shoot some WD 40 into the compressor feed line to keep the unloader valve lubed. "Thanks Craneman."

Re: Air leak

Reply #24 – March 29, 2019, 10:55:27 am

Ok so I swapped governor before I saw the rest of the comments and I did in fact find the air pouring out from center bottom hole in what I believe is the dryer...now to find one so I can drive this thing back across the state. I already tapped on it no luck. Y'all are great by the way!! Thanks

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