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Old 08-03-2014, 10:27 AM   #15
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You need to clamp the base and use a filter wrench to get that cartridge off. I replaced the whole purge valve assembly as the heater connector was broken on mine.
When you get oil coming out of the purge valve it is from the compressor and indicates it is heading for replacement. How long that takes I don't know but I had to replace my compressor at 10 years.

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Old 08-03-2014, 10:54 AM   #16
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Good point on compressor oil by-pass--oil in the dryer is just the symptom. Have worked on several new Alpines and suspect they are prone to premature compressor failure. Recent threads on rotary valve failure also being a precursor to compressor issues. The other indicator is inspection of the hi-pressure escape valve [similar to the release valve on a hot water heater] on the side of the dryer--not the purge valve on the bottom of the assembly. On Alpine coaches, I have seen the escape valve covered with oil and the protective foam cover stripped away from repeated dumps. Seeing the dump valve in this condition suggests the air system is routinely operating over the designed pressure--think dump valve is either 160 or 180 PSI. This cant be good for any of the air system components....
PS--$32 for a Bendix-type dissicant cartridge on Ebay.....

Old Scout
2003 40' MDTS
Garden Ridge, Texas
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Old 09-30-2014, 01:20 PM   #17
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All - Did this change yesterday. Taking it apart was a job because the intake air plumbing for the ISL is in front of air dryer unit. Also forgot my 15MM socket, and had to use a 5/8" instead which is very close. Cleaned up the area of the unit where the cartridge cover goes, the cartridge cover and wiped the whole thing down good with cleaner and clean towels. Taking out the old filter (was covered in oil) was not a big deal, putting in the new filter also was not a big deal, went right in, turned and locked into place by hand, did not need to push down as drawing shows. I did have to take apart the incoming air pipe for the ISL since that 8" pipe was in the way of seeing how the O-ring went back onto the unit. Good thing, found a clearance light lens inside the air-filter housing, how that got into that space is a mystery. I am not missing any lens covers, so I think someone threw it in there. It was stopped by the air filter so no damage done, but today, I am going to remove the AF and clean out that compartment prior to starting the coach and again making sure I don't have issues with it. Then reassembled the incoming air pipe, which was not too bad. Glad this job is only about every 5 years.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
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Old 09-30-2014, 03:04 PM   #18
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Think the the newer coaches have Haldex dryers; older coaches have Bendix--the cartriges in a Bendix are a bear to get loose--mine was anyway.....

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Garden Ridge, Texas
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