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Old 05-01-2010, 01:45 PM   #15
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An update on this situation -- our air dryer has always had some engine-type oil film around the purge exhaust but I didn't think it was critical. When the dealer's technician looked at this low air suspension issue when cold, he took the air dryer apart and found it was mostly full of engine oil. Apparently engine oil is leaking through the compressor drive to the air dryer, so there must be a seal that's not working, similar to the seal leak we had around the fuel pump previously. It's our theory the engine oil filling the air dryer is causing this low air issue when it's cold outside. At a minimum, the air dryer filter shouldn't be sitting in engine oil.

I'm going to wait till I get the coach over to Cummins Yakima for its annual service to fully take care of this air dryer issue since a leaking compressor would still be covered under my warranty, and I want them to see how much oil is really leaking.

We did check to see if oil had moved beyond the air dryer in the lines and it appears to have not.

BTW, the owners manual says to drain condensation from air suspension daily and I've been looking all over for a drain from the air tank or the system, with EM's help and the dealer's tech. The only air tank we have is located over the rear axle and it has no drain, but the "air suspension" drain valve next to the air chuck in the compartment behind the battery compartment appears to be designed to drain from the air tank. That produces no moisture when I drain it and dump the air. So I am assuming WRV intended for us to drain air/moisture from that "air suspension" drain valve. Anybody have any other thoughts on this?
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Old 05-02-2010, 04:45 PM   #16
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Looking at the outside canister of my Haldrex air dryer I see a part # N4253F. I see no such # on their web site. Does anyone have the # for the replacement cartridge that fits this model?
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Old 05-02-2010, 06:16 PM   #17
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Jerry, I have the same # Haldex dryer (N4253f) when I called Haldex Technical Service (800-643-2374) they know that number and tell you which filter to order. I have a good repair man here in Redding and he takes care of it when I have regular service done on the coach.
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Old 05-03-2010, 07:27 AM   #18
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Quote:
Originally Posted by Coin-Op View Post
Jerry, I have the same # Haldex dryer (N4253f) when I called Haldex Technical Service (800-643-2374) they know that number and tell you which filter to order.
Tom, do you have that filter number for us?
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Old 05-03-2010, 09:58 AM   #19
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Just checked with Haldex. The cartridge # they gave me was DQ6050. If this is the right one now all I have to do is find it. Any suggestions as to who might carry this item?
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Old 05-03-2010, 10:34 AM   #20
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RV Chassis Parts has it for $121, don't know if that is a good price.

And here is an interesting write-up from a Beaver owner on DIY maintenance including desiccant change-out photos.
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Old 05-03-2010, 11:17 AM   #21
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Looks like Jerry beat me to it #DQ6050
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Old 05-03-2010, 05:27 PM   #22
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Cool

The air dryer on my coach does not have a screw on canister as shown in the Beaver thread mentioned by Emike. Mine has an insertable cartridge. Interesting that the screw on has the same part # DQ6050.
So is the DQ6050 the correct # for the non screw on cartridge?
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Old 05-03-2010, 05:29 PM   #23
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Just reread the Beaver article....................different #. My bad.
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Old 05-05-2010, 06:46 PM   #24
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Hi All,

Based on this thread, I checked the exhaust outlet from my Haldex dryer. It was covered with oil. RV Specialists pulled the Haldex cartridge and it was filled with oil. It was mentioned previously that this malady is probably due to engine oil leaking past a compressor seal. The question is can the compressor be serviced? Who makes the compressor and is there a seal repair kit? Apparently, the compressor is hidden behind several components and will require a tear down to get to it. Any suggestions?

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Old 05-05-2010, 07:07 PM   #25
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Cummins had to replace the whole compressor on mine. Cost about $2k.
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Old 05-05-2010, 11:42 PM   #26
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Our 2006 is the one you mentioned in the part of the thread above with the air dryer filled with oil. I talked to Cummins Yakima and Robbie, their tech who will fix this for me, said it wasn't uncommon for the dryer to fill up with oil and it probably just needed a new cartridge. So we will see what he thinks when he sees it. It may be more oil than he's used to.

The compressor is bolted to the engine block, and I believe on our 06 is a Cummins part. It looks like the hydraulic pump is bolted to the back of the compressor and is driven by the compressor shaft, so that it s the component that has to be removed to get to the compressor. It does not look like a huge deal to me because it's at the bottom of the engine, passenger side, rear and relatively easy to get to. I would think that if it has to be replaced, the compressor part would be the expensive item and constitute most of the $2K that Algoma mentioned.

I think it's worth getting a good Cummins tech to look at it, since yours is an 06 like mine, and if it has compressor failure in some form, if it's not part of the 5 year warranty with the $100 deductible that came with the engine. That's what I intend to do when I get it to Yakima this summer.
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Old 05-06-2010, 10:40 AM   #27
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1) Compressor was supplied by Cummins NW, of Yakima when the engines were delivered; presumably (Bill will let us know I'm sure) covered under the 5yr engine warranty.
2) The question on the compressor is whether the oil accumulation seen in air drier is incidental oil blow-by (looks like a piston compressor so it would be an "ordinary" amount of oil past the rings), or if there are larger considerations (broken rings, bad valve seal internally, etc.) constituting a failure to contain oil.

Based on 50k/year for a truck, I'm gunna guess there is something wrong w/Bill's compressor to allow the amount of oil that would interfere w/the desiccant. Trucks don't change desiccant cartridges every 30-40k I don't think.
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Old 07-08-2010, 11:51 PM   #28
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EM et al,

We finally got our coach to Yakima yesterday for its annual service and had the air dryer serviced and the oil issue with the compressor examined. The dessicant cartridge was full of oil and water, as we knew, and we installed a new one that I purchased from the Spartan Chassis group recommended in an earlier post. Learned I could have got one at most of the other truck shops in Yakima for half the price.

Robbie agreed it was a lot of oil and water in the cartridge, but said he has seen that before. He had a simple test he used for compressor oil leak, and that was to disconnect the line from the compressor to the air dryer, hold a piece of tissue paper over the end, have somebody rev the engine, and see if it spit any oil. Did this a number of times and it didn't spit any oil. He checked all around the compressor and said it was producing the air volume it should and it was clean. He also checked downstream of the air dryer and reconfirmed, as we knew from my previous work at Holiday Motorhomes, that the air dryer wasn't moving oil downstream.

So the problem is confined to the air dryer and the question is where is it getting its oil? The most logical conclusion is that it has been coming from the breather out of the engine, which is near the air dryer. We relocated the breather tube. Robbie said that once these dessicant cartridges get wet, they tend to cause a lot of problems including sucking in engine blow-by and anything that's handy and they restrict the air flow. He felt it was a combination of the moisture and cold oil in the cartridge restricting the air flow even more on cold days. I have noticed it takes longer to get air pressure up and the spitter valve to open on the coach as time has gone on, and especially on cold days. With the new cartridge in place, I was amazed how fast the air pumped up and the spitter valve released.

So that might be another good test for this issue -- kind of be aware of how long it's taking for air pressure to build and the spitter valve to release, and if it's taking a long time, that might indicate a bad air dryer cartridge. I'm going to start timing mine for a position of dumped air to full pressure build and spitter valve release, and determine what's "normal" at various temperatures so I can see if there's a relationship. Sure wish our coaches had a built-in air pressure gauge on the dash. Maybe somebody has found a good way to install one, like maybe tapped into the parking brake switch?

We will also see how it does as the fall approaches and if this cured the issue.

The other point is Robbie suggested given that I live most of the year on the west side of the Cascades in Washington, I might want to change that dessicant cartridge at every service. This was my first time in changing it since we bought the coach 4 years ago. I didn't see this on the owner's manual of service items.
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