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Old 09-24-2022, 11:37 AM
Koelemon68 Koelemon68 is offline
Join Date: Jun 2021
Location: Haslet, TX
Posts: 16
Default Air Filter and Box

I have a RV 7 with a O-320 (160 Hp) engine. I am in the middle of my first condition inspection (Supervised)and ran across a potential problem I am not sure how to correct. I have attached pictures, but simply, Thee is a cut out a small section of the K&N air filter to fit due to the accelerator pump off the bottom of the carburetor. I feel it is a safety issue if that RTV comes loose it goes right into the carburetor. What options are there to fix this as a new filter will have the same issue?
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Carl Koele
Fort Worth, TX

Last edited by Koelemon68 : 09-26-2022 at 01:54 PM. Reason: any reference to the words "previous Owner"
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Old 09-24-2022, 12:55 PM
74-07 74-07 is offline
Join Date: Dec 2016
Location: Greenville, SC
Posts: 721

You are absolutely correct! NO RTV near any portion of the intake assemblies.
RV-8 sold
RV-7 sold
RV-8 flying
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Old 09-24-2022, 02:29 PM
Ralph Inkster Ralph Inkster is offline
Join Date: Feb 2008
Location: Calgary, Alberta
Posts: 1,960

Check Vans instructions for the FAB air filter installation, it calls for notching the filter element & applying sealant - for carbureted models...
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more
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Old 09-24-2022, 02:34 PM
Flyhud's Avatar
Flyhud Flyhud is offline
Join Date: Jul 2018
Location: Burleson, TX
Posts: 170

Your filter is notched and sealed per instructions, seems a little goofy, but it works. Have run this setup as have countless others for many hours with no problems that Iím aware of.
RV-6A/O-320 /FP/refurb in progress.
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Old 09-24-2022, 03:23 PM
planenutz planenutz is offline
Join Date: Jan 2005
Location: Arrowtown, New Zealand
Posts: 86

I agree that its pretty "average" to look at but it does work and in many years of maintaining RV's I've never seen any issues with this sealant moving if applied correctly.

Clean or replace the filter and carry on flying.

Licensed Aircraft Mechanical Engineer
RV-6, ZK-XTC - Superior IO-360, Sensenich FP, GRT EFIS, Surefly SIM
Bolkow 209-160RV, ZK-MON - IO-320, MT Prop, Retract Nosewheel, Folding Wings

Trustee and Technical Councillor for the MBSAT RV-12 builds in Whitianga
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Old 09-24-2022, 04:06 PM
moosepileit moosepileit is offline
Join Date: Dec 2010
Location: Louisville, KY
Posts: 842

O-320, I was able to fit a K&N Engine Air Filter: High Performance, Premium, Washable, Industrial Replacement Filter, Heavy Duty: E-3322 without needing to trim and seal for the accellerator pump bump.

RV-6, bought from builder.
O-320, slider, carb, mags, FP
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Old 09-24-2022, 05:20 PM
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RV6_flyer RV6_flyer is offline
Join Date: Jan 2005
Location: NC25
Posts: 4,008

My RV-6 with 320 has been flying 25-years and over 3,400 hobbs hours with the setup you are showing.

My filter has been replaced three times over the past 25-years. I had BLACK RTV like the red you have on the first two filters. I used that because that is what the early instructions told us to do. About a year ago, the filter was replaced but ProSeal was used as that is what Van's Aircraft currently recommends.

The filters are reusable but they still do not last forever. I tried the other part number recommended here for the 320 but did not like the way it fit. I sold that filter here and used the one Van's recommended for the 320 FAB some 25-years ago.
Gary A. Sobek
NC25 RV-6
3,500+ hours
Where is N157GS
Building RV-8 S/N: 80012

To most people, the sky is the limit.
To those who love aviation, the sky is home.
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Old 09-25-2022, 10:36 AM
Koelemon68 Koelemon68 is offline
Join Date: Jun 2021
Location: Haslet, TX
Posts: 16

Thank you all for the information. That really helps me a lot when putting it back together. I looked all over in the Vans sight and could not find the reference supplied above. I will probably get a new filter and do it per the Van's instructions supplied.
Carl Koele
Fort Worth, TX

Last edited by Koelemon68 : 09-26-2022 at 01:55 PM.
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Old 09-25-2022, 07:01 PM
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Larco Larco is offline
Join Date: Mar 2005
Location: DVT Phoenix
Posts: 1,300

Looks like the original builder followed the build manual. Sounds like a case of judging the original builder on the forum for the whole community to see before finding out that it was done as per instructions. Just saying? Builders manuals are easy to come by.
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Old 09-25-2022, 07:18 PM
BStoddart BStoddart is offline
Join Date: Jun 2017
Location: Michigan
Posts: 10

I think I would be more concerned about the apparent rivet to edge spacing on the plate in the bottom of the picture. I'm not sure what I am looking at there, but what appears to be rivets sticking up are right on the metal edge.
RV-7A Sloooowwww Build
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