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When are air filters considered dirty? #4659326
02/07/18 06:39 PM
02/07/18 06:39 PM
Joined: Oct 2014
Posts: 737
Pa, USA
NH73 Online content OP
NH73  Online Content OP
Joined: Oct 2014
Posts: 737
Pa, USA
When are air filters consider dirty and in need of replacement? Sure the OM says to replace at certain intervals, but most don't have hour meters and some my ZT with hour meter says 1 year or 200 hours, which every comes first. Well after almost 6 years, I hardly have 100 hours.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730
Re: When are air filters considered dirty? [Re: NH73] #4659331
02/07/18 06:44 PM
02/07/18 06:44 PM
Joined: Mar 2004
Posts: 20,755
Upstate NY
Donald Offline
Donald  Offline
Joined: Mar 2004
Posts: 20,755
Upstate NY
If this is a lawn mower then at least yearly. Does it have a foam pre-filter? You can always vacuum it mid season. If you were cutting all nice green grass it might not be a big deal. But if its the middle of the summer with dried grass and dust, then its another story. Leaf time also with a mulching blade will generate lots of dust.


2015 Subaru Forester 2.5 engine/CVT
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Re: When are air filters considered dirty? [Re: NH73] #4659339
02/07/18 06:54 PM
02/07/18 06:54 PM
Joined: Apr 2009
Posts: 2,933
Canada
boraticus Offline
boraticus  Offline
Joined: Apr 2009
Posts: 2,933
Canada
Rule of thumb says that when you hold a paper filter up to the sun or bright light and can't see light through it, it's dirty. When it is dirty, I just blow it out with compressed air. I've done in numerous times and it seems to have worked for me.

Oiled filters usually show a build up or film of dirt on the intake (outside) of the foam. Some oiled filters have two layers a coarse outer layer and a fine inner layer. If the exterior layer is in need of cleaning, chances are that both filters should be cleaned.

If a filter is real dirty, it will cause the engine to run rich and in extreme situations, will cause rough running and black exhaust.

Depending on operating conditions, some filters can last a long time. Cutting grass with little to no dust has little effect on air filters. Dry dusty conditions on the other hand can clog a filter quickly and require often cleaning and likely result in much shorter service life overall.

Re: When are air filters considered dirty? [Re: NH73] #4659373
02/07/18 07:29 PM
02/07/18 07:29 PM
Joined: Jun 2003
Posts: 17,347
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,347
Deplorable in apple valley, ca
It's been my experience that an air filter has to be pretty dirty to cause a restriction. They look terrible but still flow fine.


02 Wrangler durablend 10w40
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Re: When are air filters considered dirty? [Re: NH73] #4659409
02/07/18 07:59 PM
02/07/18 07:59 PM
Joined: Mar 2012
Posts: 1,277
San Antonio, TX
E150GT Offline
E150GT  Offline
Joined: Mar 2012
Posts: 1,277
San Antonio, TX
when the restriction gauge that the factory didn't install, but you did, shows too much restriction.


1984 Mercedes-Benz 300SD - 100k
1995 F150 XL 4.9 reg cab 5MT - 251k 5w30
2016 Mazda6 Touring 6MT - 57k 10w30
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Re: When are air filters considered dirty? [Re: boraticus] #4659422
02/07/18 08:13 PM
02/07/18 08:13 PM
Joined: Dec 2016
Posts: 6,226
Waco, TX
Linctex Offline
Linctex  Offline
Joined: Dec 2016
Posts: 6,226
Waco, TX
Originally Posted By: boraticus
When it is dirty, I just blow it out with compressed air. I've done in numerous times and it seems to have worked for me.


This.

I only replace the element if I see any damage.


"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."
Re: When are air filters considered dirty? [Re: E150GT] #4659430
02/07/18 08:25 PM
02/07/18 08:25 PM
Joined: Oct 2014
Posts: 2,409
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,409
San Antonio, TX
Originally Posted By: E150GT
when the restriction gauge that the factory didn't install, but you did, shows too much restriction.


You've installed restriction gauges on your OPE air filters?

What are your guidelines on say a riding mower / ZTR vs a push mower vs a weedwacker regarding numerical values for too much restriction?


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: When are air filters considered dirty? [Re: NH73] #4659448
02/07/18 08:47 PM
02/07/18 08:47 PM
Joined: Feb 2014
Posts: 2,285
Kansan,1911 45ACP fan
Marco620 Offline
Marco620  Offline
Joined: Feb 2014
Posts: 2,285
Kansan,1911 45ACP fan
I replace mine every 100k miles. I buy the Injen Nano filter (XX1010)blue and throw a pantyhose layer on top and then my AEM Prefilter. Even when I used AEM Dryflow filter and the cutouts to a buffer pad for prefilter in my intake resonator all my filters stay clean.UOA's show virtually no particles. Been running the Injen Nano / AEM Dryflow types since 2013.


15' Civic 179k.0w20 Redline/Archoil9100,Eibach,Yokohama/Borla Exhaust/Tein Suspension/Fu7317/Redline Si-1
Right to work state proud. Non union household
Re: When are air filters considered dirty? [Re: NH73] #4659592
02/07/18 11:17 PM
02/07/18 11:17 PM
Joined: Mar 2011
Posts: 1,808
CA
spackard Offline
spackard  Offline
Joined: Mar 2011
Posts: 1,808
CA
It's harder to tell with a constant-speed engine. With a mower, if you aren't able to mow as much a path as you are used to it's either the blade needs sharpening, the AF needs cleaning/replacement, or the valves need adjusting, if adjustable. In my experience.

Re: When are air filters considered dirty? [Re: NH73] #4659667
02/08/18 05:50 AM
02/08/18 05:50 AM
Joined: Feb 2010
Posts: 406
Detroit
Motorking Offline
Motorking  Offline
Joined: Feb 2010
Posts: 406
Detroit
Originally Posted By: NH73
When are air filters consider dirty and in need of replacement? Sure the OM says to replace at certain intervals, but most don't have hour meters and some my ZT with hour meter says 1 year or 200 hours, which every comes first. Well after almost 6 years, I hardly have 100 hours.


From an engineering standpoint, they are considered "dirty" when they are restrictive. You can ad a cheap restriction gauge (available at most truck parts stores) to any air cleaner housing on the dirty side


Jay M Buckley
FRAM
(248) 808-4551
[email protected]

Re: When are air filters considered dirty? [Re: NH73] #4660137
02/08/18 05:27 PM
02/08/18 05:27 PM
Joined: Oct 2014
Posts: 2,409
San Antonio, TX
Nyogtha Offline
Nyogtha  Offline
Joined: Oct 2014
Posts: 2,409
San Antonio, TX
^^^^ I can't believe this dicussion on installing restriction gauges on OPE air filters has made it to this level of a Technical Training Director of a major filter manufacturer.

Motorking, I'll ask you the same question I asked earlier in this thread.

What are your guidelines on say a riding mower / ZTR vs a push mower vs a weedwacker regarding numerical values for too much restriction?


"No matter how paranoid you are you're not paranoid enough. Tell the truth. Reach as many people as you can with it. That's your weapon." - Susanne Modeski, aka "Holly" to The Lone Gunmen
Re: When are air filters considered dirty? [Re: NH73] #4661647
02/10/18 08:50 AM
02/10/18 08:50 AM
Joined: Jun 2005
Posts: 5,244
North Texas
ARB1977 Offline
ARB1977  Offline
Joined: Jun 2005
Posts: 5,244
North Texas
My Honda gets filled with grass every year. I just blow it out and reuse. I change it every other year.


2015 Tacoma 4.0L 60K (as of 02/23/18)
AMSOIL SS 0W30 / Toyota filter

2018 CRV 1.5L (as of 05/11/18)
Factory fill / Honda filter
Re: When are air filters considered dirty? [Re: NH73] #4661999
02/10/18 02:55 PM
02/10/18 02:55 PM
Joined: Jun 2007
Posts: 1,428
FL
CharlieJ Offline
CharlieJ  Offline
Joined: Jun 2007
Posts: 1,428
FL
My mower with a B&S 550e engine has a foam air filter. The mower gets hard to start when the filter is dirty from the air restriction and is acting as a choke. Thatís when I know the filter is dirty and to clean it. Happens once or twice a year.

Last edited by CharlieJ; 02/10/18 02:56 PM.

'07 Mazda3 2.3 Mobil 1 HM 5w-30
'84 Mazda Rx-7 Valvoline Maxlife 10w-30
Re: When are air filters considered dirty? [Re: NH73] #4662100
02/10/18 04:45 PM
02/10/18 04:45 PM
Joined: Oct 2014
Posts: 737
Pa, USA
NH73 Online content OP
NH73  Online Content OP
Joined: Oct 2014
Posts: 737
Pa, USA
I decided blow out the air filters this time. They still look a little dirty, but I can see light through them. Also got myself a spark plug gap gauge. They checked good. Don't need to buy air filters and spark plugs. Might as well get as much life out of them as you can.


2017 Toyota RAV4 Hybrid
2004 Ford Explorer Sport Trac
2012 Gravely ZT XL 48 w/ Kawasaki FR730

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