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Author Topic: AD2 air dryer  (Read 1073 times)
Melbo
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« on: November 12, 2017, 07:18:30 PM »

How easy is it to change out an AD2 to an AD9.  My AD2 began to purge every second or so during the recharge cycle and when I asked about a rebuild / service package I was told that I would be better to replace the AD2 with the AD9.  I have serviced the 2 in the past with good  results.  Is it worth the trouble or is the 9 that much better?  If the function is the same why change. Why not just service what I have.  I hate to ask (do not want to open a can of worms) but what are the general opinions on the bus board.

thanks

Melbo
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bevans6
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« Reply #1 on: November 13, 2017, 04:03:56 AM »

My AD2 is plumbed with all hard lines that would have to be reconfigured to fit an AD9.  Probably cut off, re-terminated and use flexible lines to the AD9 ports.  I thought it would be a lousy hard job to do.  FWIW I just bought a brand new AD2 purge valve rebuild kit from Bendix for around $20.  Still available.
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jmblake
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« Reply #2 on: November 13, 2017, 04:29:05 AM »

I replaced mine with a AD9 drier only because the can rusted through, Like Brian said it was a pain getting the air lines re plumbed but other than that pretty easy.
Jason
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luvrbus
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« Reply #3 on: November 13, 2017, 05:27:00 AM »

Fix your AD-2 it is so easy to service vs the the AD-9 if you go with the AD-9 watch the knocks off they sell on the E place watch the the terms " replacement or style" buy a Bendix more dollars but a better dryer a older bus doesn't need the drying capability of a AD-9 the AD-2 is more than adequate  ,tell Billie hi for us
« Last Edit: November 13, 2017, 06:13:21 AM by luvrbus » Logged

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chessie4905
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« Reply #4 on: November 13, 2017, 05:46:42 AM »

If you decide to upgrade, you can change all or some of the lines to DOT nylon and appropriate fittings. Would make things easier in future, even with old one. If old hard line goes too far to it's connection point, you can cut out a piece and splice to nylon. Also nice that AD-9 is shorter, although fatter. If old one is in excellent shape, probably makes sense to keep it.Parts for 2 are available and prices are still reasonable, so I guess 6 of one, half dozen of the other.
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brmax
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« Reply #5 on: November 13, 2017, 07:04:47 AM »

All great comments on the options for you. I wanted to further promote to anyone doing this work. That the DOT apporved fittings are the best option, and with the approved plastic type lines the connector fitting will have the stainless or brass insert for the line that needs to be used, thus strengthening the connection. Hth

Good day
Floyd
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luvrbus
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« Reply #6 on: November 13, 2017, 07:26:11 AM »

If I was doing a AD-9 on a MCI I would by pass the lines the lines going to the AD-2 and mount the AD-9 in a different location,on MCI's the location up front is a terrible place for a air dryer to service IMO 
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PP
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« Reply #7 on: November 13, 2017, 08:16:41 AM »

A long time ago I thought that if I ever had problems with my air dryer I would exchange it out for an Ad-9. But now that I'm having problems and getting ready to remedy them, I've decided it will be much simpler and easier just to service the Ad-2 that I have. Now I just have to sneak under the bus when management isn't watching  Shocked or push it one more trip to our next destination where I can do moderate work. I do have a towing policy... Wink
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luvrbus
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« Reply #8 on: November 13, 2017, 08:27:38 AM »

I really liked the AD-9 for a replacement for the AD-2 at first till I serviced a few,to many bolts and o-rings on the AD-9,the AD-4 is even worse   
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TomC
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« Reply #9 on: November 13, 2017, 05:23:32 PM »

I just got a knock off AD-9 from Freightliner. About half the cost of the Bendix rebuilt and you don't need a core to turn in. I'll see how it works in the future. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Melbo
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« Reply #10 on: November 13, 2017, 05:37:39 PM »

Well it seems the consensus is to service what I have.  I will be doing that directly.  I have a place that I have gotten all the necessary supplies before and I have a way to get the bus up in the air so I can work on it.  I agree the dryer is in an awkward place but it will have to stay there.  Billie says thank you Clifford and hi back. 

Melbo
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If it won't go FORCE it ---- if it breaks it needed to be replaced anyway
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PP
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« Reply #11 on: November 14, 2017, 05:04:40 PM »

BIG THANK YOU TO BRIAN (Bevans6) for the suggestion to pump my brake a few times and get the air dryer in the closed valve position before shutting down the diesel. I got an opportunity this AM to take the bus on a short hop and when I fired it up (didn't even have time to preheat-50° ambient temp) she fired right off and aired up with no issues. Still going to service the air dryer soon, but that little trick seemed to worked this time.
Thanks, Will
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PP
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« Reply #12 on: November 16, 2017, 09:50:58 AM »

Just a quick followup here. I pumped the brakes until I got the air down to 90PSI when I parked the bus 2 days ago and this morning I heard the brake caliper bang as I was getting out of bed, it just now dropped to less than 60PSI. She's never held air this long before and I've owned her 10 yrs now. I figure after I service the air dryer she'll probably hold air forever  Cheesy All the times I've crawled around looking for air leaks, I never suspected the purge valve. My bad. Embarrassed
Will
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Jim Eh.
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« Reply #13 on: November 16, 2017, 11:44:14 AM »

Another option is to upgrade to an AD-IP or some other spin on replaceable cartridge style/make dryer. Bendix is not the only player in the market.
Then the desiccant can be service in <10 minutes.
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Jim Eh.
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TomC
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« Reply #14 on: November 17, 2017, 09:11:28 AM »

I had an AD-2 on my first truck and was easy to rebuild. I now have an AD-9 and it was old enough where the rebuild kit didn't match up. That's why I just replaced the whole thing. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
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« Reply #15 on: November 17, 2017, 10:06:14 AM »

I had an AD-2 on my first truck and was easy to rebuild. I now have an AD-9 and it was old enough where the rebuild kit didn't match up. That's why I just replaced the whole thing. Good Luck, TomC


Yea parts people get the AD-4 and the 9 all mixed up sometimes while both look the same they are not BTDT
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brmax
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« Reply #16 on: November 17, 2017, 10:41:47 AM »

Thats a good mention Tom, as there has been some upgrades on the purge valves.
Many times I found the need to remove the lines so cleaning the base with air and some brake and “electric” solvent most always, no make that always. This stuff was not harmful to rubber, I think Napa no longer makes the same product as before.

Them spin on dryers! I was lucky, had 3 before retiring, sweet. Just behind the cab on some dumps I maintained, just walk right up, no crawlin no pretzel bending. A real gem I thought with the few years experience with them.

Good Friday
Floyd
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TomC
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« Reply #17 on: November 18, 2017, 07:47:19 AM »

"No crawlin no pretzel bending." The exact reason for switching to a truck conversion. Good Luck, TomC
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Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
Oonrahnjay
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« Reply #18 on: November 24, 2017, 06:56:07 AM »

  Another option is to upgrade to an AD-IP or some other spin on replaceable cartridge style/make dryer. Bendix is not the only player in the market.
Then the desiccant can be service in <10 minutes.   

     I did (but "some other" in that I went with the Bendix AD-IS}, but then again, I was working with a situation where there was never any air dryer on my bus and I was starting from scratch and the issue of existing brackets, fittings, valve lines, etc. didn't come up.  Also, I was replacing just about everything on the air system on my bus so I just designed a system (with the help of Bendix tech info and advice from the instructor at Bendix brake school) to take advantage of the isolated pressure ports on the AD-IS.  It doesn't make any difference Melbo and his needs, but there it is.
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Bruce H; Wallace (near Wilmington) NC
1976 Daimler (British) Double-Decker Bus; 34' long
6-cyl, 4-stroke, Leyland O-680 engine

(New Email -- brucebearnc@ (theGoogle gmail place) .com)
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