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Old 02-21-2021, 12:36 PM   #1
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Diesel Air Filters

Came across this article and wanted to share and get some feedback. This is something I never knew about and wonder what everyone thinks.

https://www.practical-sailor.com/sys...better-filters

My Yanmar has a simple foam filter, which I do replace/clean but never gave it another thought. I have used K&N filters on a few vehicles and motorcycle, not just for alleged performance gain but also for their lifetime usability. I'm thinking maybe something like this makes sense for my boat. Is anyone using one of these or something similar?

https://www.walkerairsep.com/product_marine.asp
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Old 02-21-2021, 02:00 PM   #2
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I had a S&B (similar to k&n but built stronger) on my 6bta when I had the old Mainship. Also had one on a Dosge/Cummins pickup.
I put the one on the boat in case I had a “water event” and the filter got wet. A paper filter would be ruined but the s&b could be dried out.
The one on the truck let it breathe
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Old 02-21-2021, 02:19 PM   #3
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The stock air filter on my Universal M25 sailboat engine was a course foam ring 1/4" thick that you could see through. Not really a filter, the parts book calls it a silencer. I replaced it with a lawn mower filter similar to a K&N. The intakes on my Perkins T6.354's look like a big funnel with a screen across, holes in the screen are about 1/8". No filters at all. Not happy about that, but it doesn't look like you can retro a real filter in there. Granted a boat engine doesn't see the dust a lawn mower does, but there is some.
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Old 02-21-2021, 02:54 PM   #4
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Double checking the intake size 3.5" and then getting K&N RC-4570 air cleaners for the FL120
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Old 02-21-2021, 05:12 PM   #5
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Quote:
Originally Posted by Soo-Valley View Post
Double checking the intake size 3.5" and then getting K&N RC-4570 air cleaners for the FL120
Thanks I may look into a K&N or S&B universal filter also. Couple questions.

Do you have any concerns about whether the filter you choose allows sufficient air volume without restriction for your engine?

Do you have a crankcase vent to deal with at your air intake?

Also just found this which looks like a good solution for my engine:

https://walker-airsep-superstore.mys...for-yanmar-6lp
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Old 02-21-2021, 05:22 PM   #6
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I will be switching from plain foam CAT intake filters to Walker air. When I change the oil this spring.

For my 3208TA it is about $150 each.
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Old 02-21-2021, 05:26 PM   #7
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I just found this which should work for my engine:

https://walker-airsep-superstore.mys...for-yanmar-6lp
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Old 02-21-2021, 06:12 PM   #8
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Quote:
Originally Posted by backinblue View Post
Thanks I may look into a K&N or S&B universal filter also. Couple questions.

Do you have any concerns about whether the filter you choose allows sufficient air volume without restriction for your engine?

Do you have a crankcase vent to deal with at your air intake?

Also just found this which looks like a good solution for my engine:

https://walker-airsep-superstore.mys...for-yanmar-6lp
I got the idea from a thread here and that OP routed the oil breather into the filter as it is now. I am considering a catch can. Yes K&N will allow more air than the stock filter. Besides it works well for the car & bike, I have the cleaner and oil.
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Old 02-21-2021, 08:43 PM   #9
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When I got my boat the PO did not fi any air filter at all. Maybe was he thinking that his engine bay was clean enough to require none.
First thing I did was to fit one. I got a K&N that fit the intake. Not that I am seeking for any performance increase or whatsoever just to avoid a loose plastic bag I could have forgotten to find it way to the engine heart.

L
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Old 02-21-2021, 11:45 PM   #10
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Quote:
Originally Posted by Lou_tribal View Post
When I got my boat the PO did not fi any air filter at all. Maybe was he thinking that his engine bay was clean enough to require none.
First thing I did was to fit one. I got a K&N that fit the intake. Not that I am seeking for any performance increase or whatsoever just to avoid a loose plastic bag I could have forgotten to find it way to the engine heart.

L
I fully expect to do the 1/4 nautical mile in less than 2 minutes once I put on those high performer filters.
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Old 02-22-2021, 07:16 AM   #11
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I just installed a Walker Airsep on one of my CAT 3208TAs over the weekend. I did not do it for the air filtering, the OEM solution worked fine for that, I did it for the oil control. The OEM oil control is inadequate and oil gets in the turbo and after cooler. Fingers are crossed that it will do the trick. I'll be putting one on the other engine in a month or so.
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Old 02-22-2021, 08:00 AM   #12
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My John Deere came with a K&N. Have 2 that I clean and swap. Like the idea of being able to change it quickly if I feel it's necessary. Added a Parker Hannaifin separator to the valve cover vent. Very happy with its performance. Engine room stays nice and clean as a result!

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Old 02-22-2021, 11:33 AM   #13
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I've wondered about this a good bit. My DD 4-71s have no filter (looks like they never have). Just an air box.

Has anyone seen air filters for 4-81/6-71s? Not sure how I'd fit one on the intake - it's probably a 12" x 3" rectangle opening.
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Old 02-22-2021, 11:43 AM   #14
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My concern too. It was no problem putting a good filter on the sailboat engine, it was designed as a tractor engine so intended to have a good filter. But the big turbos on the Perkys, I don't know if adding a filter would cause problems. And this is a really old, somewhat neglected boat so the engine room is not particularly clean. That's another project in itself.
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Old 02-22-2021, 01:34 PM   #15
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It's kind of mind boggling to me that these very expensive engines don't include a decent air filter and PCV system. Having a hose from the crankcase laying on top of the air filter to suck in whatever oil and fumes that come out of it? Serious Engineering there! Am I missing something?
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Old 02-22-2021, 01:36 PM   #16
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Quote:
Originally Posted by Soo-Valley View Post
I fully expect to do the 1/4 nautical mile in less than 2 minutes once I put on those high performer filters.
I know you are joking, but you are also missing the main point of this thread.
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Old 02-22-2021, 01:46 PM   #17
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Quote:
Originally Posted by backinblue View Post
I know you are joking, but you are also missing the main point of this thread.
No joke, I fully intend on doing what I said. I expect to reach 8 knots off the line too.

I think we beat to death that most filters need changing/upgrading.
And it brought me to remember to do mine, thus getting the K&N
What is the point of this thread BTW
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Old 02-22-2021, 01:59 PM   #18
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No joke, I fully intend on doing what I said. I expect to reach 8 knots off the line too.

I think we beat to death that most filters need changing/upgrading.
And it brought me to remember to do mine, thus getting the K&N
What is the point of this thread BTW
The point is, if you read the practical sailor article, that many diesels have no air filter or have a foam rubber "screen" that can deteriorate. Either way, just because the water is basically a dust-free environment doesn't mean your engine doesn't need a decent air filter. Also the crankcase ventilation potentially adding oil to your intake warrants some consideration in my opinion.
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Old 02-22-2021, 02:08 PM   #19
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I changed my engines silencers only intake protection to a K&N filter many years ago, roughly 30.
I asked about the silencers fitted and was told marine engines don't see enough dirt for it to be a problem.
I did not believe it so I changed to the K&Ns and am glad I did.
In my case I was able to fit a 14" diam. and 4" high unit which only needs cleaning every few years. I also fitted a telltale vacuum guage which is how I know the filter has never plugged. Once tripped it must be physically reset.
It has never tripped.

Regardless every 5 yrs I clean the filters. When I do clean it though it has caught lots of dirt and who knows what that would otherwise have been sucked into the engine.

Yes, there is a noticeable bit more of intake suction noise but it is not objectionable.
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Old 02-22-2021, 02:10 PM   #20
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Originally Posted by backinblue View Post
The point is, if you read the practical sailor article, that many diesels have no air filter or have a foam rubber "screen" that can deteriorate. Either way, just because the water is basically a dust-free environment doesn't mean your engine doesn't need a decent air filter. Also the crankcase ventilation potentially adding oil to your intake warrants some consideration in my opinion.
Good, I did not miss the point of the thread.
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