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Author Topic: BENDIX AIR DRYER AD-4  (Read 7078 times)
johns4104s
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« on: January 19, 2010, 06:37:57 PM »

Would this dryer do the job if I installed it on my 1981 MCI 9? Somehow the bus does not have one?.

Thanks

John
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« Reply #1 on: January 19, 2010, 06:41:49 PM »

Hey John,

Are you sure? It's normally mounted in the front on an MCI.

I'd go with an AD-9 if I were you. Easier to maintain from what I've heard. I installed one on our Eagle and haven't had to do anything yet, so I'm just passing along what I've learned. We didn't have a drier, it was an option in 1968.

Paul
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« Reply #2 on: January 20, 2010, 04:11:59 AM »

John, Not sure but that may be what was on there when new. I see a AD-4 and a 9 on Ebay. I think my 5 has a AD-2 but would have to look.  Tom Y
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« Reply #3 on: January 20, 2010, 04:33:05 AM »

Would this dryer do the job if I installed it on my 1981 MCI 9? Somehow the bus does not have one?.

Thanks

John

Look between the front wheels on the forward bulkhead,  Mine has an AD-9 now and it is a lot quieter than the old one(AD3 IIRC).     Check prices and parts availability also.
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« Reply #4 on: January 20, 2010, 04:38:05 AM »

I was over at a truck parts place last Saturday and they had new AD-9s for $180.  I thought that seemed like a good price.  I didn't get a chance to ask if it could be optained in a 24 volt version.  (For the heater in the purge valve.)  I would go with the Ad-9 if adding an air dryer.  They are very standard and everybody sells parts plus a mechanic could fix one in his sleep.

I see the going price on Ebay for an AD-9 is right around $170 or a little less for an aftermarket unit.  There is a used one bidding at $15, but you'll need to rebuild the purge valve and replace the cartridge at minimum.  You'll also need to buy or make a mounting bracket.  I see there is even an aftermarket model for $130 new.  The seller claims he is overstocked.

I also see a new 24 volt purge valve for $25 I might grab as a spare.  They are a lot more than that at the truck parts place.  I like how the seller claims it is for Freightliner, Mack, Volvo when they use 12 volt.
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« Reply #5 on: January 20, 2010, 05:11:18 AM »


The the only electric is the heater and you can get 12v or 24v.  HTH Smiley
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« Reply #6 on: January 20, 2010, 05:29:36 AM »

John, check with Doyle he paid 35.00 for a AD-9  it looked new but I forgot where he bought it,any model will work for you the old AD-2 is a hard one to beat


good luck
« Last Edit: January 20, 2010, 05:33:51 AM by luvrbus » Logged

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« Reply #7 on: January 20, 2010, 06:07:36 AM »

Yepo John, I got it from Gary B in Vegas.  The desiccant cartridge was about $20... Sonny helped me install it (actually he did it!)  put it after the ping tank and at least 6' to 8'  away from the compressor to dissipate the heat.  Get the best bargain you can find regardless of model and make sure you can get the cartridge.

dg
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« Reply #8 on: January 20, 2010, 06:09:40 AM »

Would this dryer do the job if I installed it on my 1981 MCI 9? Somehow the bus does not have one?.

Look between the front wheels on the forward bulkhead,  Mine has an AD-9 now and it is a lot quieter than the old one(AD3 IIRC).     

Someone posted awhile back on re-locating the air dryer to a more conveinant spot for servicing.

Under the bus on the bulkhead or in the middle somewhere is fine when you have access to a pit,  but for the average guy thats not always available.

The person mentioned above relocated it to somewhere near the back.

There was also pictures posted by dezeldave on his 54 where I believe he mounted it in the engine compartment closer to the compresssor than recomended but easily serviced.
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« Reply #9 on: January 20, 2010, 06:24:39 AM »

This is where we installed one on our 01 Eagle. I know it's an MCI thread but it's still a drier install.

Not sure where in an MCI you can mount it, just food for thought.

The air line come out of the compressor, over to the ping tank on the opposite side then back the the drier. I installled a switch for the heater with an LED so I can see it if it's on, that is if I remember to look!

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« Reply #10 on: January 20, 2010, 06:32:07 AM »

Eagle has always mounted the air dryer in the engine compartment without problems.
Mine is on the drivers side at the back on the 05 close to what Paul's setup is and easy to service.
Model 10 and 15 are in lower corner of the passeners side.



good luck
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« Reply #11 on: January 20, 2010, 09:22:14 AM »

The the only electric is the heater and you can get 12v or 24v.  HTH Smiley

Correct that only the heater is 12 volt or 24 volt, but most of the new ones will be 12 volt and not 24 volt.  A lot of places may not stock the 24 volt version.  This might not matter if you never had a drier and can run a 12 volt line to it instead of 24 volt.  Most of the ones on Ebay seem to be 12 volt although some of the places selling new ones might have 24 volt models.

You don't even have to hook up the heater if you never intend to drive in freezing weather, but what happens when you have that mid winter emergency and have to make a drive into cold weather?
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« Reply #12 on: January 20, 2010, 09:28:04 AM »

My AD-9 is in about the most inconvenient place possible for servicing.  It is up underneath the bus in a little space maybe 15 inches wide.  I had a heck of a time getting enough leverage with a wrench to remove the hoses going to it to remove it for servicing.  It is such a bad job I might pay someone with a hoist or pit to do it next time.

It doesn't appear the original owner had ever serviced the air dryer as all the bolts and stuff still had paint on them like they had never been disassembled for servicing.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #13 on: January 20, 2010, 09:44:06 AM »

My MCI is wired so that the air dryer heater comes on when the coach heating fan is on, same switch.  Stud 49 in the front panel, and a 3 amp in-line fuse.

Brian
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« Reply #14 on: January 20, 2010, 10:12:45 AM »

I thought the purge valve heaters are thermostatic?  Don't they typically get power all the time when the vehicle is running?

On an MC5 the air dryer could be a later add-on.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #15 on: January 20, 2010, 10:50:51 AM »

It's factory on mine but definitely a factory option, and the connection is shown in the schematic and mentioned in the manual, so I thought it might be common to John's MC-9, since they are both from the same date.  According to the manual, they were optional, though.  The heater is a "60 watt 24 volt heater thermostatically controlled to 50 deg to 85 deg".

I thought it worth mentioning because some people may have removed the bus heat blower motor and not realized that the same switch that turns on the heat/AC evaporator blower turns on the air dryer purge valve heater.  Strictly speaking, the dash switch is a dual gang switch, up turns on the AC and runs the blower on high, down turns on the blower and sets it to low speed.  The switch terminal that runs to the blower motor low speed terminal is the one that turns on the purge valve heater.  It also would turn on the optional Expello valve heater, which is an automatic drain for the wet tank.

Brian
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« Reply #16 on: January 20, 2010, 05:06:59 PM »

Pay attention to Brian's good explanation, MCI busnuts!

Ripping out the stock HVAC and not finding a source of power for the air drier will leave you parked somewhere in the cold with no air pressure!

Running the coach in the cold with the HVAC switch turned off will also cause air problems.

Where, north of the Mexican border, did we not see freezing temps in the last few weeks?

Leave your air drier purge valve un-powered at your peril!!!

happy coaching!
buswarrior
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« Reply #17 on: January 20, 2010, 06:14:32 PM »

John,

You back in TX yet?
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« Reply #18 on: January 20, 2010, 06:25:43 PM »

Belfert-

Heck of a good price... beats the $680 price quoted me in White River Junction. Of course, WRJ carries top quality stuff, like $1000 compressor governors. Mine lasted nearly one full year Angry

Nellie
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« Reply #19 on: January 20, 2010, 06:46:03 PM »

Bus Warrior, no freezing temps in Yuma Grin
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« Reply #20 on: January 20, 2010, 07:45:44 PM »

Nellie, for $680 I sure hope they were at least going to install it for you.  I don't recall ever seeing an AD-9 even at Napa for more than about $250 or so.

Someone must be looking for a buyer that wants to make the owner's boat payment for the month.
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Brian Elfert - 1995 Dina Viaggio 1000 Series 60/B500 - 75% done but usable - Minneapolis, MN
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« Reply #21 on: January 20, 2010, 09:07:49 PM »



Mine came with dryer but not heater,  guess because the Original owner was trailways in 'Bama and it ran folks to Orlando from what I here.

After having frozen air dryer issues, here was my saga trying to hook up the heater,  I thought it was just the fuse and come to find out there was no wire at all.

http://www.busconversions.com/bbs/index.php?topic=10721.0

Mine had been replaced and the heater was 12v,  there is a link to the 24v heater part # in that thread


Johns4104s, did you look to see if you had one?

 you can service it if you run the front up on blocks and you may be plumbed for it if you don't have one

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Nellie Wilson
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« Reply #22 on: January 21, 2010, 04:42:06 AM »

Belfert -

Where were you when I needed you? Smiley

I didn't know the air dryer heater was controlled from the coach. My 'mechanic' said it was 'automatic' and probably just burned out. But now I see it works just fine!

Oh, the cost of ignorance. When I think of the AGGRAVATION (and expense) a little knowledge could have saved me... Cry

And the worst part? I know I'll go through it again and again, until I learn one heck of a lot more.

I swear I'd drop everything if i could get a real old-fashion 'bus guy' to take me through 'bus immersion school.' I've learned one thing though: When someone says, "Oh, it's just like a truck," I know they don't know squat.

Thank you - and you too, BW - for the knowledge.

Nellie Wilson

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« Reply #23 on: January 21, 2010, 05:44:56 AM »

Nellie, you could do what I did - get the manual, get the bus, read the manual cover to cover (a few times, I have about worn out sections of my manual in the 8 months since I got it and the bus) and go out and look at the bus to find the bits in the picture.  Take the air brake course.  You already do all the maintenance yourself and none of this is rocket science!  After a while it all starts to make sense, particularly with the help and feedback from the board members who have the life long experience we are trying to emulate!

BTW, on your air lines.  I have been going through and replacing all of the original air lines (a lot of mine were still original!) with fabric covered heavy duty air line from my local hydraulic shop.  I've been making up oil and hydraulic brake lines for my race cars for years, so when I went in to get an air line made up, they sold me the line in bulk and a bunch of the  end fittings.  The hose cuts to length easily with hose cutters or a hacksaw, and with a vise and a couple of wrenches you can assemble the ends onto the hose really very easily.  Maybe ask about that at the air line store, and you could buy a bunch of hose and some ends and make up what you need yourself.  Saves the assembly fee, which at my place is a flat fee that is often more than the cost the parts, so your price more than doubles.  For brake lines, modern practice has the nylon line that looks like PEX and push on fittings.  They assemble with no tools at all, and are designed to be really easily repaired at road side.  Something that I am going to investigate fully when I start going through my brake lines and cans in the spring!

Brian

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« Reply #24 on: January 21, 2010, 05:51:45 AM »

NewbeeMC9, What model drier to you have? I have a 24v heater, I think but will have to look. It may be a AD 2   Tom Y
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« Reply #25 on: January 21, 2010, 10:32:32 AM »

My opinion regarding the original question , fo rwhat ever it's worth. Go with a AD-9, everyone uses them, they work great, most shops will have parts or a replacement. If you go to a truck wrecker/shop you may even find one that isn't very old and be able to get the mounting brackets as well for a very reasonable price. Worked for me.

Grant
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« Reply #26 on: January 21, 2010, 05:33:00 PM »

NewbeeMC9, What model drier to you have? I have a 24v heater, I think but will have to look. It may be a AD 2   Tom Y

Thanks TomY, I have an AD-9 and it came with a 12V heater.  I found out the hard way that i didn't have the wire in the first place. Shocked Cheesy

It is all hooked up now.  I have 100 amp equalizer so plenty 12v.

Funny thing too is if you bypass the switch, you kill one battery if it gets cold Shocked Grin,  I have it going through switch now too.
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« Reply #27 on: January 22, 2010, 10:43:44 PM »

Bevans6 -

That is welcome information. I thought attaching end fittings would be bear... special tools and all that. in fact, that's the main reason I haven't begun to replace lines. Just seemed so tedious. you know, pull the line and take it to the shop, then wait to get a new one made up, then... well, you get my drift.

But doing it your way, I could do a little at a time. And, eventually, they'd all be fresh!

BTW, I used that nylon / push on system when installing plates and replacing some air bags. They are sooo slick, even I could do it. Main thing is to cut with something really sharp, so you don't crease the nylon.

I'd like to use them everywhere, but don't if they'd work (be safe) for certain applications?

Nellie Wilson
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« Reply #28 on: January 23, 2010, 05:26:36 AM »

Regarding the push on fittings,

I'd be concerned as to their useful life, and when will they start leaking or pull apart due to age.

The designed useful life of a new truck or bus isn't what it used to be.

anyone have connections?

happy coaching!
buswarrior

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« Reply #29 on: January 23, 2010, 05:36:20 AM »

The hoses I have been replacing so far were in the engine compartment, so potential for excess heat and so I used the heavy fabric covered hose.  Push-on hose seems to be used  extensively in industry for brake and suspension lines outside of the engine compartment, or where heat isn't an issue (lines to/from the compressor itself come to mind).  But that's just my observation looking at trucks and from my air brake course (instructor was a long time truck mechanic/driver/small fleet owner and liked the nylon a lot).  Lord knows the fabric lines I replaced had a best-before date long expired, so they don't have indefinite life.  I will be really curious to learn what others closer to the industry think of the push-on hose system, life time, applications best suited, and all of that.  My MCI made  in 1980 has the nylon line in use for the air door, and wipers, so it seems to have lasted a long time in that application, although I don't think those lines have pushon fittings.

Brian
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1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
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1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
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« Reply #30 on: January 23, 2010, 06:49:44 AM »

My bus uses a steel armored line from the compressor to dryer.  As far as I am aware the Series 60 doesn't use any air to operate so I don't have other air lines in the engine compartment.

My bus is now 15 years old.  It uses the new nylon air line and push fittings in a number of applications with no issues I am aware of.  It seems to last a long time.
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