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Topic: Air Dryer Bypass (Read 1774 times) previous topic - next topic

Re: Air Dryer Bypass

Reply #25 –
Okay so I installed it today which was a fairly easy job as I had the tools. I disconnected the inlet hose on the air dryer and the outlet hose to the wet tank and connected those together with the parts listed. I used a Teflon paste to seal the threads and I had a little bit of trouble getting it lined up while laying on my back on a layer of heavy gravel. Getting to the communication air hose on the back of the air dryer was difficult so I just remove the air dryer and then got it off that way. I noticed that there was some oil in that line as well as desiccant powder in the out flow of the air dryer going to the wet tank. I also remove the desicant cartridge and looked in. The purge valve at the bottom seem to have some oil on it.
So at this point I'm wondering if my compressor is passing oil through it. I expect that's probably not normal? I did as crane man suggested and while I was doing all this I figured I might as well, took the D2 governor off and sprayed some corrosion x down the middle hole. When I did that I realized that the gasket that I put on wasn't lined up correctly although air was definitely getting through and and obviously my air dryer has failed.
Saturday I'll be in Texas and I will rebuild the air dryer and put it back together and hopefully everything will be fine. If not I'll have the air compressor rebuilt in Mexico. If that's what it needs anyway.
After I installed everything sprayed some corrosion x into the governor hole into the compressor put everything back together again started the engine and let it get up to 90 PSI then I opened up the wet tank and pretty much dry air just came out no more desiccant. I let it run at 1500 RPM and it got up to about 130 PSI. Stopped there, I went back and crack the wet tank and pretty much just dry air came out with no desiccant that was observable. I sprayed some PB blaster in the purge valve after spraying it with brake cleaner. When I rebuild it we'll see if that changes anything.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Air Dryer Bypass

Reply #26 –
In the 3rd pic. of the compressor you can see 2 Allen head cap screws.  If you remove them along with those washers, then the piece that the governor bolts to will just slip off the compressor.  This action will expose the unloader assembly which you can remove and clean. This is the simplest unloader assembly to inspect and clean there is.  The reason I mention this is if the compressor is building pressure then it most likely is OK and needs no other fixing. You and Mark can clean the unloader assembly in less than an hour.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Air Dryer Bypass

Reply #27 –
Thanks mike. I did see those bolts and figured that's what was underneath there. Hopefully the corrosion x will relieve things enough that I won't have to do that but that would be the next step after rebuilding the air dryer. And probably I should do that at the same time. Cuz that's what the problem seems to be is unloading the pressure when it gets to the set point. What about the oil in the small communication line? Any input on that?
Thanks
Bob
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Air Dryer Bypass

Reply #28 –
Quote from: Journey, Roam, Explore –
1. Hopefully the corrosion x will relieve things enough that I won't have to do that but that would be the next step after rebuilding the air dryer.
1a. And probably I should do that at the same time.
2. Cuz that's what the problem seems to be is unloading the pressure when it gets to the set point.
3. What about the oil in the small communication line? Any input on that?

Bob,
1. Won't hurt
1a. Yes just to be safe.
2. With the unloading pressure set point changing it is possible goobiede gop fouling the operation of the unloader valve.
3. That tells the dryer when to blow down and drain moisture. With the dryer not blowing down properly this line needs cleaning to make sure the system is a clean as possible. When the dryer works properly that moisture in the line will be expelled.

Mike

Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Air Dryer Bypass

Reply #29 –
So update since installed. I drove another 250 miles almost with the bypass in and my pressures stayed like they should maybe a little higher than with the old Governor but nothing major hovering between 1:20 and 1:30. Of course no purging is involved because there is no air dryer. I'm now at Mark's AKA text hubs place and Uvalde Texas and plan on rebuilding and reinstalling before heading south. As someone recently told me, you really don't need an air dryer as long as the wet tank gets drained on a regular basis at least for short distances.
Chuck I don't think that there were pre-existing issues with my air dryer. I changed it out in Arizona, just because I didn't know when the last time any maintenance on it had been done. And it worked fine for 6 months at least and couple thousand miles of driving. Maybe I'll find out when I rebuild it but maybe I won't I may have to replace the whole unit. Mark's got a spare so I may buy that from him or replace it with one from finding parts. Not sure yet.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Air Dryer Bypass

Reply #30 –
NAPA stores are good places to source a complete rebuilt air dryer (if required).  Be sure you keep the old unit until after you have transferred all the fittings to the new one, then you can return the old one to receive a refund of your core deposit.

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: Air Dryer Bypass

Reply #31 –
This was for two sets. Hope they are the correct fitting. NO shipping cost also.
Scott
If you have any questions, please email us at sales@HoseandFittings.com
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Release Date: 10/30/2021


SKU            Name                                Retail    Qty      Total
-----------------------------------------------------------------------------
2408-04        37° Seat JIC Hex Plug              $0.4543      2    $0.9100
2501-12-12    Male JIC x Male Pipe 90° Adapter  $4.4621      4    $17.8500
5000-12-12    Female Pipe x Female Pipe Adapter  $2.6623      2    $5.3200
-----------------------------------------------------------------------------
                                                Subtotal:      8      $24.08
                                    Shipping & Handling:              $0.00
                                                  Total:              $24.08
   

Contact us with any questions or concerns at (260) 426-4673 or
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Re: Air Dryer Bypass

Reply #32 –
After rebuilding my air dryer I found that it still did not work properly as it was in purging. Ordered one from the local Napa store and will be here tomorrow. I'll have to take my old air dryer off again. Again take the new parts that I just put on it off. Put the old parts back on as that's going in as the core. I'll install the new one or just keep the bypass on until I get to Mexico. Not sure exactly why it failed so quick and I probably could get it replaced under warranty but I just don't have time. Kind of disappointing. I'm wishing now that I just replaced the filter and the desiccant cartridge and called it a day on the old one.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired