Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 06-24-2011, 11:14 AM   #15
Senior Member
Join Date: Aug 2008
Posts: 335
I have travelled about 600 miles since I dried out the wet filter and now checked the filter minder and it was clear to the top..ordered a new filter..looked up the pipe above the filter and it has a metal flange with air vents on the side of it..not sure how it is supposed to keep wanter out of it . will look more in the morning. thanks for the replies. Mel

Melorene is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 06-27-2011, 09:21 AM   #16
Senior Member
spike45's Avatar
Join Date: May 2011
Location: Cookeville, TN
Posts: 778
Originally Posted by Melorene View Post
I have traveled about 600 miles since I dried out the wet filter and now checked the filter minder and it was clear to the top..ordered a new filter..looked up the pipe above the filter and it has a metal flange with air vents on the side of it..not sure how it is supposed to keep water out of it . will look more in the morning. thanks for the replies. Mel
It is a sorry state of truck design and MHs are no better. Air intake systems have at best fair water separation methods. Most have poor to nonexistent water separation.

Gary Spires
Retired Cummins (Fleetguard) Field Engineer
spike45 is offline   Reply With Quote
Old 06-27-2011, 09:43 AM   #17
Senior Member
bullheaded's Avatar
Join Date: Aug 2009
Location: Dallas,Texas
Posts: 980
Originally Posted by spike45 View Post
Engine O&M Guides do not list air filter service interval information because that is not something that is predictable like lube oil, fuel or coolant filter service intervals. Air filters will accumulate dust at varying rates due to ambient conditions depending on terrain, location, traffic, and weather. Because of these varying and complex interaction conditions, air filter service you should be doing is NOT inspecting the filter element to SEE if it is plugged. The most reliable and safe method for determining air filter condition and remaining life is to use a restriction gauge such as the Filter Minder(tm) by Engineered Products of Waterloo, Iowa. This product is now the most commonly used indicator in the engine business, LD, MD, and HD diesel (some gasoline).

How does a Filter Minder Air Filter Service Indicator work?

Restriction indicators are able to measure the small pressure differences between the ambient air pressure and the air pressure on the clean side of the air filter. Most engine manufacturers list the upper limit of air filter life as being 25 inches water, about 1 PSI difference in air pressure. Engine ECM controls measure manifold absolute pressure and adjust fuel rates accordingly. It would appear that most MH operations do not achieve sufficient run time and miles to bring on air filter plugging. If you check your restriction indicator, you may see little movement and conclude that it does not work. This is a common but unfortunate outcome even for large on-highway truck fleet operators who commonly put on 125,000 plus miles per year. For them, with their miles, they frequently change the air filter yearly, whether it is needed or not. For them, that works as they generally keep their units for 4 -5 years then trade them off.

For the MH operator a yearly air filter change is much less desirable as the miles involved are few. Air filters will pass dust when first installed. Usually, it will be during the first 25 hours of normal operation. New air filters are usually 99.3% efficient but after the initial 25 hours the efficiency goes up to 99.8%+ and remains for the duration until the 25 inch restriction limit is achieved. Fewer changes will equate to less dust ingested due to filter service. Any ingested dust is cumulative. Eventually, with enough changes the accumulated dust will reach 4 - 5 ounces, enough to cause cylinder bore and ring wear on a midrange size engine like a Cummins C, ISC, ISL, Caterpillar C9, C12 and comparable engines from International and Detroit.

While it is undesirable to get an air filter wet, the effects are usually short lived. Wetting the air filter will cause the indicator to rise, sometimes to the point of achieving the maximum restriction. It is an easy matter to check the restriction and reset it. Do not change the air filter because of that instance. If it rises to a high restriction level quickly again. Service the element at that time and reset the indicator.

What I am recommending you do for a PM interval for the air cleaner system is to determine that restriction indicator is functioning correctly. If it fails to lock up showing maxium achieved restriction the indicator does you no good. Then you may be forced to change the air filter if you have such doubts.

To test a restriction such as the Filter Minder(tm), operate the engine a low idle speed. Cover the air inlet such that you are inducing an artificial restriction simulating plugging conditions on the air filter. As restriction rises, you should see the indicator rise to some level and hold in that position when you remove the restriction. Shut the engine off. Push the yellow rubber button on the bottom of the Filter Minder(tm). It should drop down to the lowest level. If it does not, the sensing line or small brass fitting is plugged. The small brass fitting on this device has a porous bronze filter. Sometimes they become plugged with dust. There is also a very small orifice hole in the bronze filter fitting. It has been known to plug. If the gauge does not reset, remove it and the brass fitting to clean the fittings. Blow them out with compressed air and use of some solvent or even water. When you re-install the gauge, be careful not to see how strong you are. The Filter Miner(tm) now is made with a straight thread and o-ring seal. It can be hand tightened easily. If you have the earlier style, it has tapered pipe thread. It was easily possible to over-tighten that gauge and crack the housing.

What if the gauge does not lock up during the restriction test? In that instance the gauge is faulty. Replace it.

For some there may be the original restriction gauge from Donaldson. It has a red flag indicator with no means of showing advancing restriction. I would recommend replacing that gauge with the one listed above.

That is all there is to PM interval based air filter maintenance. You should periodically check the rubber boots and band clamps. The rubber boots and elbows on the clean side of the air filter must remain pliable for the band clamps to be able to seal. Due to heat and time, the rubber will take what is called a 'compression set' and become hard. Removal of those boots and connectors and re-installing may not result in the same level of air tight seal that you need to prevent dust ingestion. This is especially important if your air cleaner is a Far Ecolite or any replaceable housing air filter. Tightening the clamp may make the clamp tight but the boot hose does not clamp onto the air housing.

Gary, myself and I'm sure many others, enjoy reading your factual posts. Thanks for your contributions!
2014 King Aire 4593
24' Stacker w/toys = 75' of fun
bullheaded is offline   Reply With Quote
Old 07-02-2011, 11:30 AM   #18
Senior Member
rmmpe's Avatar
Join Date: May 2007
Location: Northeast PA
Posts: 1,146
Having spent over 30 years in the fluid conditioning industry in positions including engineering, testing, specifications, quality, applications and manufacturing, I'm at least qualified to and do support Gary's comments.

The man knows of what he speaks and should be used as Gospel .

Bob (Squidly Down Under) & Peg - 2013 Ford Focus pushing a 2011 Phoenix Cruiser 2552S
"In God we trust" to preserve our country and bring our Troops safely home.
Carry on, regardless..................
rmmpe is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Journey 36G Engine Air Filter Installation SteveG Winnebago Industries Owner's Forum 20 08-27-2017 02:27 PM
Air Dryer Filter Change today...Did I do it right? leedowney Freightliner Motorhome Chassis Forum 10 11-14-2015 08:27 AM
After market air filter dynaride99 Class A Motorhome Discussions 26 02-28-2011 12:19 PM
Engine Air filter Replacement sailor_lou Travel Supreme Owner's Forum 7 10-13-2010 07:41 PM

» Featured Campgrounds

Reviews provided by

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 01:14 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.