Don't cut them off.
The etching primer is thick enough that you lost the clearances for a
slip fit. During the assembly you probably scrapped the paint enough to
cause galling (or little paint rolls) which has locked it up.
Clean off the primer, I would use a spray of acetone to clean the inside
of the tube from the rear. That will loosen the paint up. Use a fine
tip heat gun and heat the frame only where the interference is. Etching
primer gets soft at about 200F (just to a sizzle when water put on it is
enough). That will not hurt the tubing or firewall. Remove the heat
and use alcohol to cool the insert then tap again. If it moves in go
ahead and try to move it in further or make an extraction tool.
I made the same mistake on one aircraft and had to put a painfully long
screw (5/16 inch with a washer head ground to fit) inside the gear frame
tube but large enough to catch the insert wall. I then borrowed a slide
hammer to extract the insert. Lucky for me it was only in about an
inch. But it still requires removing the bolts from the frame,
machining a bolt head which will fit your slide hammer, replace the
frame bolts, and then heating the stupid thing, cooling the insert and
then pull it out.
Now I just ream, squirt with zinc chromate or the Corrosion X (ACP or
ACF 50) and tap it in wet and recoat front and rear to seal it in. If
you put primer on both the parts and let it dry, make the paint thin and
use the ACF 50 as a lube as well as for anticorrosion.
Hope it helps.
Bud Yerly,
Custom Flight Creations.
----- Original Message -----
From: flyingphil2<mailto:ptiller@lolacars.com>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Thursday, April 03, 2008 1:39 PM
Subject: Europa-List: Mod 72 Debacle
<ptiller@lolacars.com<mailto:ptiller@lolacars.com>>
Suppose that you were doing Mod 72 and it was going to be really easy
as you you are still building and haven't got the engine attached.
So, suppose that you have borrowed the club reamer and opened up the
tubes in the undercarriage frame and cleaned them out. The unpainted
inserts could then be pushed in by hand until only about 1cm was
showing.
Suppose then that you were rather enthusiastic with the etch primer
and after it had dried, tried to push the inserts in. Having got them
half way in with a hammer, what would you do if they really really
didn't want to go any further in? I mean hitting them with a hammer via
a block of wood is just splitting the wood.
What would you do? I doubt they are going to come out. Should I hit
them harder, heat the frame, pour acetone down to remove the etch primer
or just wait for the ACF 50 to work it's way through and try again?
Any thoughts would be more than appreciated,
Thanks,
Phil
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