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08-28-2011, 11:40 PM
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Join Date: Sep 2007
Location: Florence, AL
Posts: 626
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Sealing a 1" hole in firewall.
Ok, so I've pulled the vacuum pump and all associated equipment and I'd like to seal the hole.
I'm thinking I have a few options:
A.) A stainless patch riveted into place
B.) A simple plug from the aviation isle at Lowe's
C.) Reinstall the line splitter and AN cap it.
Any suggestions?
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08-29-2011, 12:04 AM
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Join Date: Mar 2007
Location: Sonoma County
Posts: 3,821
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A...........................
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08-29-2011, 12:44 AM
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Join Date: Sep 2007
Location: Florence, AL
Posts: 626
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Quote:
Originally Posted by gasman
A...........................
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Seems like a good idea, but all the A&P's I keep talking to don't recommend it. |
08-29-2011, 06:36 AM
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Join Date: Oct 2005
Location: 08A
Posts: 9,477
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Quote:
Originally Posted by Tram
Seems like a good idea, but all the A&P's I keep talking to don't recommend it.
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Why is that?
__________________
Dan Horton
RV-8 SS
Barrett IO-390
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08-29-2011, 07:40 AM
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Join Date: Dec 2004
Location: I live in on the Rosamond Skypark (CA) and am married to Victoria (Tuppergal).
Posts: 982
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I recently pulled my vacuum system and had to plug a hole a bit bigger than 1". I bought two oversize steel washers and sandwiched the firewall with them using a 5/16" bolt and a steel locknut; cheap and functional  Rosie
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Paul A. "Rosie" Rosales
Rosamond Skypark (L00), CA
RV-6A, 4200+ hours since 7/4/2000
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08-29-2011, 08:06 AM
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Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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A.
I just put 2 patches in my firewall from a rewire and vacuum pump removal. Put some Proseal or even high-temp RTV in between and rivet them on.
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Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
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08-29-2011, 08:11 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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Quote:
Originally Posted by Rosie
I recently pulled my vacuum system and had to plug a hole a bit bigger than 1". I bought two oversize steel washers and sandwiched the firewall with them using a 5/16" bolt and a steel locknut; cheap and functional Rosie |
I agree with this, easy to do and bullet-proof.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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08-29-2011, 08:35 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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Why not (B)? - with a suitable sealer of course.
The steel plug is just as fireproof as the thin SS you would patch with, and would look neater too....
It is also Vans solution on the -A model hole for the nose gear leg bolt hole.
__________________
Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
Last edited by az_gila : 08-29-2011 at 08:42 AM.
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08-29-2011, 08:35 AM
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Join Date: Jul 2005
Location: North Atlanta
Posts: 1,120
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Quote:
Originally Posted by Rosie
I recently pulled my vacuum system and had to plug a hole a bit bigger than 1". I bought two oversize steel washers and sandwiched the firewall with them using a 5/16" bolt and a steel locknut; cheap and functional Rosie |
I bought the stuff to do the same but was worried the solution would find itself not centered at some time resulting in leaking fumes into the cockpit. How did you ensure it would remain centered over the hole besides tightening the bolt?
From Rosie: I used a permanent marker to mark the washer location and I put a couple of torque-seal stripes on it as well. Also, I used fender washers (way oversize) so even if it moved, the bolt would hit the firewall hole edge and the washers still cover the hole. I look at it every 50 hours when I change the oil (so far have 122 hrs with no movement)
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Sid Lambert
RV-7 Sold
RV-4 - Flying - O-320 Fixed Pitch - Red over Yellow
Last edited by Rosie : 08-29-2011 at 09:07 AM.
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08-29-2011, 09:10 AM
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Join Date: Jul 2009
Location: Mojave
Posts: 4,643
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I've patched many holes in the -8's firewall and go with "B" whenever possible. You can peen the tabs over to make the installation permanent if you're worried about security. RTV seals out the fumes too. Nice, neat fix.
I'll rivet a patch only on the really big holes like where the heater box was.
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WARNING! Incorrect design and/or fabrication of aircraft and/or components may result in injury or death. Information presented in this post is based on my own experience - Reader has sole responsibility for determining accuracy or suitability for use.
Michael Robinson
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Harmon Rocket II -SDS EFI
RV-8 - SDS CPI
1940 Taylorcraft BL-65
1984 L39C
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