At the airport today I decided to check
whether my RD1B drive adapter plate had streaks from the rivets as well.
It does. I didn’t disassemble anything so could only look at those that
could be seen with a light and a mirror through the holes in the flywheel that
are not blocked by the counter weight – IOW, I guess it was 4 rivets that
I checked. All had the dark streak going radially outward, similar to what Mark
showed in the photo. On the ‘head side’ only two of the rivets had
a very faint sign of discoloration toward the outside.
There is no sign of any looseness or
relative movement whatever of the plates.
Mark; have you had a chance to examine
more closely?
Al
Subject: [FlyRotary]
Re: RD2-C Flywheel Adapter Plate
I've
never encountered this before but I'd remove the damper, and examine the
streaks under a microscope or 10x loop. Obviously you want to check for
looseness of the rivets. Try gripping the shop head with vice grips and
see if you can turn the rivet in the hole. If yes, return the damper to
me and I'll evaluate & rework it as needed.
Tracy
On Tue, Mar 16, 2010 at 10:08 PM, Mark Steitle <msteitle@gmail.com>
wrote:
Tracy,
The first time I noticed the streaks I just cleaned
them off. They may have be caused by corrosion X used previously, but I
have no way to tell. Approx. 2-3 hours of running have occurred since I
first wiped it clean and reinstalled the psru and I have not used any corrosion
X or anything else that could cause the streaks to reappear. I've
attached a picture of the other side which shows similar streaking. So,
my guess is they are aluminum streaks. Assuming they are smoking rivets,
what's the recommended fix?
Mark
I get
similar looking streaks caused by the corrosion X that I spray around in that
area to prevent rust & corrosion. But if that is aluminum dust
instead of oil, it requires immediate attention. Are you able to tell?
Tracy
This post is directed toward those of you that have a
few hundred hours or more on your RD2-x gearbox. I'm getting
"smoke" streaks leading out radially from the circle of rivets on the
flywheel adapter plate on my 20B. Do others find these streaks on their
adapter plates? I'm wondering if the rivets are working loose and need to
be replaced or upgraded. Maybe I need a beefier adapter plate. Am I
worrying over nothing, or is this something that is headed for an in-flight
failure?
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