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Old 10-27-2008, 09:20 PM
cnpeters cnpeters is offline
Join Date: Jun 2006
Location: St. Louis (Eureka), MO
Posts: 283
Default How tight for 90 degree brake cylinder elbows?

For AN822-3D 90 degree alum. elbows that attach to my brake pedal cylinders (Bonaco brake lines attach on the nipple ends), how tight have folks tightened these as they rotate them in? Just put fuel lube/EZ turn and tighten 'til fairly tight, or do folks torque these?
Carl Peters
St. Louis, MO
RV-9A finishing kit
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Old 10-27-2008, 09:48 PM
gasman gasman is offline
Join Date: Mar 2007
Location: Sonoma County
Posts: 3,928

Run it in by hand, then on the next turn with a wrench, set it at the direction that you want. It is small........ use a small wrench.
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Old 10-27-2008, 10:56 PM
lorne green lorne green is offline
Join Date: Dec 2005
Location: Oliver, B.C. Canada (Okanagan valley)
Posts: 786
Default AN fitting torque

Hand tight (snug) then a quater of a turn. I'm told.
RV 7a tip-up
Pre-cover MD-RA Inspected.
Canopy completed. Bonded with Sika-Flex.
Up on her mains, Firewall Fwd and wiring on going.

Last edited by lorne green : 06-16-2013 at 08:32 PM.
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Old 10-28-2008, 06:18 AM
Rockyjs Rockyjs is offline
Join Date: Aug 2006
Location: Gulf Breeze, FL
Posts: 416

I had a problem with both my lower left master cylinder fittings leaking. It seams that the tap used by Matco left some scoring across the threads. One of them I had to crank in pretty hard and used fuel lube. The other I gave up on and sent back and received a credit from Vans. Do a search there has been discussions here recently.
Rocky McKiernan
Navarre, FL
N767JM RV-7 Flying
N1011D (res) RV-10 Building
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Old 10-28-2008, 06:43 AM
Mel's Avatar
Mel Mel is offline
Join Date: Mar 2005
Location: Dallas area
Posts: 10,976

After getting a pipe thread hand tight, you will have at least one full turn available for "setting" the direction you want.
Mel Asberry, DAR since the last century. Over 1,000 certifications accomplished.
EAA Flight Advisor/Tech Counselor, Friend of the RV-1
Recipient of Tony Bingelis Award and Wright Brothers Master Pilot Award
USAF Vet, High School E-LSA Project Mentor.
RV-6 Flying since 1993 (sold)
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Old 10-28-2008, 10:15 AM
robpar robpar is offline
Join Date: Jul 2008
Location: Vancouver British Columbia
Posts: 85

I'm not a pipe fitter but I have done extensive pipe design as well as being a mechanic for 25 years. From this I have had NO good experience with pipe threads. I can not remember an OEM application that used pipe threads on brake components, they leak! The auto manufacturers have been eliminating pipe threads from every component and replacing with gasketed or o-ringed seals. It surprised me that aircraft use pipe threads on brake components.

I have found that installing pipe thread elbows is a bad idea. It is best to install straight male connectors and put the elbow on the hose. If space does not allow than you will have to use the elbow. You will very likely find that where the elbow seals and where it needs to point are never the same. Do not back off a pipe thread fitting to position as it will leak. Over tightening can split the housing. Be very very careful using sealants with brake fittings for fluid compatibility, I would recommend dry fitting I would not recommend using Teflon tape on brake fittings as little pieces of tape can easily get into the system. I would look for components that do not use pipe threads especially on brakes. Pipe threads do not do well in vibrating conditions, they loosen and leak!

I have only found two types of pipe threads; Those that ARE leaking and those that are ABOUT to leak. If any of the components are stainless steel they will always leak.

Sorry for the rant but NPT threads are not suitable in my opinion for anything other than your water taps at home.

Bob Parry
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