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  #1  
Old 08-19-2021, 09:21 PM
moespeeds moespeeds is offline
 
Join Date: Apr 2021
Location: west berlin
Posts: 64
Default My brake line elbows are leaking on my Grove aluminum gear legs - Options?

The AN4/1/4 NPT elbows that screw into the top of my aluminum gun drilled gear legs are leaking. Looks like they were both installed dry, so I've got to get them out to put PTFE on them.

I tried cutting a bit for clearance as you can see in the photo, but there isn't enough room to unscrew that fitting without it hitting the bottom skin. So basically it won't rotate a full 360.

If there was a such thing as an elbow with a short end on the AN side, I could cut these off and screw that in, as I only need about 3/32" more for clearance, but a google search was fruitless.

Any other options here besides pulling the gear legs?
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Last edited by moespeeds : 08-19-2021 at 09:31 PM.
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  #2  
Old 08-19-2021, 10:44 PM
TS Flightlines TS Flightlines is offline
 
Join Date: Apr 2010
Location: Ridgeland, SC
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Default

Moe there isnt. And not enough room to rotate the fitting out, reseal it and reinstall. Without cutting a big hole in the floor of the gear tower, the only option I know of is to pull the gear leg.

Tom
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  #3  
Old 08-20-2021, 06:06 AM
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riseric riseric is offline
 
Join Date: Oct 2011
Location: Québec, CNV9
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Default

What Tom said.
Unknowingly, I originally installed those fittings dry.
After putting the hydraulic oil in, yep, they leaked.
Removed the legs, sealed the fittings reinstalled the legs and no more leaks.
Lesson learned...
It is true that the fittings could maybe be elsewhere to permit maintenance without having to remove the legs...
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  #4  
Old 08-20-2021, 07:35 AM
moespeeds moespeeds is offline
 
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There is one possibility that I came up with in the shower this morning.

In the race cars we use an Aramid PTFE brake hose that's ultra flexible. I'm wondering if I could cut out that elbow fitting, put in a straight fitting, then replace the hard line with an Aramid hose with a 90* fitting on the end...

I'll order a -4 straight and the 90* fitting so I can assemble on the bench and test the clearance.
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  #5  
Old 08-20-2021, 07:40 AM
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Snowflake Snowflake is offline
 
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While you're at it, take the time to put some kind of wear protection between that (aluminum?) line and the very tight hole that it runs through. A leaking fitting might just weep, but when the skin saws through that line over time it'll leak a lot faster.
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  #6  
Old 08-20-2021, 07:55 AM
moespeeds moespeeds is offline
 
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The builder has tubing in there, it's just slid up and out of the way in that photo. If I go the flex line route I'll have to drill the hole bigger anyway so I'll put snap bushings in there.

Why does Vans use these giant -4 fittings for brakes on these tiny little calipers? We use -3 lines to stop 3,000 lb cars.
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  #7  
Old 08-20-2021, 08:09 AM
rmarshall234 rmarshall234 is offline
 
Join Date: Jun 2008
Location: San Diego, CA
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Default

Quote:
Originally Posted by moespeeds View Post
There is one possibility that I came up with in the shower this morning.

In the race cars we use an Aramid PTFE brake hose that's ultra flexible. I'm wondering if I could cut out that elbow fitting, put in a straight fitting, then replace the hard line with an Aramid hose with a 90* fitting on the end...

I'll order a -4 straight and the 90* fitting so I can assemble on the bench and test the clearance.

Ah...the Shower Solution! That's the best problem solver there is, nice job thinking outside the box.
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  #8  
Old 08-20-2021, 08:48 AM
TS Flightlines TS Flightlines is offline
 
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probably not enough room to get a straight nipple AND a 90* hose end in there, whether a block style fitting or not.

The shower was the problem---you have to wake up from a dead sleep!

Tom
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Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7A Tail Kit Completed, Fuse started-Pay as I go Plan, on hold while we develop new products for RV builders
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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  #9  
Old 08-20-2021, 10:06 AM
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Walt Walt is offline
 
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Why not just run hard lines down the legs like the plans call for?
Would way be easier than pulling the gear.
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  #10  
Old 08-20-2021, 10:17 AM
Taltruda Taltruda is offline
 
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Location: Las Vegas, NV
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Quote:
Originally Posted by Walt View Post
Why not just run hard lines down the legs like the plans call for?
Would way be easier than pulling the gear.
These are the Grove airfoiled gear, so there is no fairing to cover the external brake line.
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