Mailing List flyrotary@lancaironline.net Message #39875
From: Russell Duffy <rusty@radrotary.com>
Subject: RE: [FlyRotary] Heater Outlet Threaded?
Date: Sat, 13 Oct 2007 21:06:33 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message

Is it really screwed into the housing?  If so, would it be to much to  hope for it to be 1/2"npt? Any ideas on how to salvage the simple barbed on hose setup?

Hi Scott,
 
I've pulled these out of a few housings, and they've all been pressed in.  My goal was to plug them up, so I measured the remaining hole, and found that a 3/4"-10 tap works perfectly.  I use a big allen head bolt, and an o-ring type washer to seal it.
 
I always figured I could drill out one of these bolts, then tap the hole for a normal size pipe thread, or I could weld a fitting on the drilled out bolt.  It's a goofy size thread, so there's no hope of finding something off the shelf.  For the life of me, I can't recall why I didn't drill and tap it for a normal size, but I have to believe there was a good reason (maybe not enough material for the next NPT size???). 
 
Since it's all together, all this drilling and tapping seems like a bad idea, though Ed's method sounds safe enough.  
 
Cheers,
Rusty
   
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