Skip to main content ↑ ↓
Topic: Haldex air dryer  (Read 2083 times) previous topic - next topic

Re: Haldex air dryer

Reply #25 –
Try to break all lines and fittings loose before you unbolt the dryer.
Some of them can be a problem if you are trying to hold it down and turn a fitting.
You may want a piece of pipe that will go over your wrench and extend the length about a foot.
John Duld
1995 U320C SE 40'

Re: Haldex air dryer

Reply #26 –
Jimmy,  it took me a couple of hours and I used solderless connectors like these;

Re: Haldex air dryer

Reply #27 –
Jimmy,if you think you had a contaminated system I would also get a isolation valve (look on beamalarm) just to be on the safe
side,I found one for about $20.Then you could clean the old one and have a spare,lastly what is a bowmore?
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Haldex air dryer

Reply #30 –
Thanks for all the replies,  and yes , you gentleman and lady  ( Michelle) correctly identified Bowmore,
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #31 –
It's reminiscent of a Laphroaig but the water source has less peat .
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #32 –
For a minute I thought you had too much and meant "boy with mower"!!!
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Haldex air dryer

Reply #33 –
"Too much" isn't a Scottish concept
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #34 –
Quote from: Jimmyjnr –
"Too much" isn't a Scottish concept
As I recall those old Scotsman TT suspensions would collapse if you tried to move them with the tankage more than half full. But maybe were talking about something completely different here.
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Haldex air dryer

Reply #35 –
So, how many times can you regenerate a desiccant air dryer filter in an ELECTRIC OVEN before it becomes unstable? Or damaged? Lot of surgery suites and other critical environments go thru this constantly by blowing superheated dry air thru the desiccant filter media. What dryer brands are polluting the rv air system?
Old Phart Phred, EIEIO
89 GV ored 36' #3405 300 hp cat 3208 ATAAC side radiator, mountain tamer exhaust brake

Re: Haldex air dryer

Reply #36 –
I'll bite,ZERO just buy a new one and follow Brett's advice and get the reman every other time.The only way to fully answer the
question would be to let one turn to powder in a coach.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: Haldex air dryer

Reply #37 –
Quote from: Old phart phred –
So, how many times can you regenerate a desiccant air dryer filter in an ELECTRIC OVEN before it becomes unstable? Or damaged? Lot of surgery suites and other critical environments go thru this constantly by blowing superheated dry air thru the desiccant filter media. What dryer brands are polluting the rv air system?
Thinking about the difference between a air dryer installed in a "fixed" location (surgery suite) versus a "mobile" location (RV), two factors come to mind: vibration and rapid heating/cooling cycles.  A desiccant cartridge installed in a motorhome lives a much rougher life, compared to one in a hospital.  I wonder if this has anything to do with the dryer media, in some cases, turning into the dreaded "white dust"?
1993 U280 SE 40' WTBI, Build: 4359
C8.3 300hp, 6-Speed, Exhaust Brake
960 watts on the roof (6 x 160)
Sorento (or BOLT) on a Kar Kaddy SS
"Nature abhors a vacuum"

Re: Haldex air dryer

Reply #38 –
Just looking at the thread sealant, is there a sealant specifically for air lines that does not set ?
Just thinking about future maintenance
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #39 –
I use Rectorseal #5.
Brett Wolfe
EX: 1993 U240
Moderator, ForeForum 2001-
Moderator Diesel RV Club 2002-
Moderator, FMCA Forum 2009-2020
Chairman FMCA Technical Advisory Committee 2011-2020

Re: Haldex air dryer

Reply #40 –
Thanks wolf
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #41 –
My research lead me to pick Loctite 567, but there are cheaper options for sure...
50ml Tube Loctite® 567 PST High Temperature Thread Sealant | Fastenal
Don
Quote from: Jimmyjnr –
Just looking at the thread sealant, is there a sealant specifically for air lines that does not set ?
Just thinking about future maintenance
The selected media item is not currently available.
Don & Tys
1999 U270 3602 WTFE #5402
Xtreme Stage 1 w/Headlight, Step Conversion, etc.
2009 Honda Fit Sport with Navi
Freedom is NOT "just another word for nothing left to lose"... with apologies to Kris Kristofferson

Re: Haldex air dryer

Reply #42 –
Just looking at the spec for rectorseal is states 100psi ?
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #43 –
I use plumber's thread dope or Teflon tape
on air fittings coming off my 150psi shop compressor with no problems,  and I used thread dope on my Haldex.

Re: Haldex air dryer

Reply #44 –

We use Permatex 59235 High Temperature Thread Sealant on all pipe threads.  Don't like Teflon tape as it can shred and move through the system.
Amazon.com: Permatex 59235 High Temperature Thread Sealant, 50 ml Tube:...

As an Amazon Associate Foretravel Owners' Forum earns from qualifying purchases.

Re: Haldex air dryer

Reply #45 –
Quote from: Jimmyjnr –
Just looking at the spec for rectorseal is states 100psi ?


Rectorseal handles greater than 100 PSI AFTER it has cured (can take up to 48 hours).  100 PSI, or less, immediately for gas and water in pipes 2 inches or less.

The advantage of tapes over pipe sealants is that tapes can handle full pressure immediately, while sealants require cure time.  You can also mess up connections using dope/sealants.

A service center will probably use tape over a sealant because they need to test the system at full pressure.  Telling a customer the job will take up to 48 hours isn't going to bring in business.  So either they are using tape, or testing at full pressure before a sealant has fully cured, or you are waiting for several days for them to complete the job because the sealant is curing.

I used yellow tape this last time when I replaced the front pressure regulator.  Four wraps, and it's been holding fine.

Re: Haldex air dryer

Reply #46 –
A few of you guys recommend disconnecting hose before removing whole unit from Chassis.
Where does fitting end and hose begin 
Jimmy
2003 U295 3620

Re: Haldex air dryer

Reply #47 –
Our Haldex air dryer has pipe thread openings for air in and out.  We have short adapters with male pipe threads on one end and a male flare on the other end.  This adapter screws into air dryer, and the large diameter air hoses with female flares screws on the other end.  Flare fittings are easily removed and attached, use no sealant and are not over tightened.  It is the tapered pipe thread adapters that are difficult to remove as they are over tightened, and have been in place for a long time.  Also right-angle pipe thread fittings have the additional concern to be sure they face the right direction when finished being tightened.  Remove flare hose fitting, remove pipe thread adapter, remove air dryer.

Re: Haldex air dryer

Reply #48 –
Any advice on waterproof electrical connections
Jimmy
2003 U295 3620