[MDairheads] Exhaust Port Thread Question

[Chris Kennedy]

Afternoon Kevin,

Your cutting the exhaust collar to protect the flange was certainly the
right thing to do in your case. The damage looking at the photo is certainly
minimal and could be addressed by using an appropriate file and some careful
dressing. A die is the best way to go. I did a quick online check and you
can find 52 X 2 mm dies on ebay for around $65. Deeper digging may get you a
used one for less.

If you use either go slowly and I recommend just use the die by hand. It's
all it should need.

Cheers Chris


-----Original Message-----
From: MDAirheads
[mailto:mdairheads-bounces+chrisk224=comcast.net at casano.com] On Behalf Of
Kevin Fahey via MDAirheads
Sent: Sunday, August 19, 2018 7:00 PM
To: Maryland Airheads
Subject: [MDairheads] Exhaust Port Thread Question

Evening All,


When attempting to remove the exhaust crossover pipe to clean trust from it
and the exhaust pipes, I found it was rusted solid to both exhaust pipes.


So I decided to go ahead and remove both exhaust pipes.  They're pretty
rusty.  I also wanted to make sure they hadn't rusted into the exhaust
ports.


The left side exhaust nut came off smooth as butter.  Right side loosened a
couple turns and then would not budge.  Having paid attention to advice
passed along in the prior tech sessions I've attended, I went ahead and cut
the exhaust nut off rather than force it off.


Found the reason it hung up was some slight damage to a thread as you can
see in the attached photo.  I'm guessing it happened during a removal by a
previous owner.


Looks to me like I should be able to clean it up with a die since the damage
isn't too severe or too extensive.  Is this the recommended course of
action?  If so, anybody know what size die to use and possibly a source that
sells them?


Kevin