Today's Message Index:
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1. 03:26 PM - "Worn Out" CT-Q67 Cable Assembly (Warning!) (Matt Dralle)
2. 03:55 PM - Re: "Worn Out" CT-Q67 Cable Assembly (Warning!) (Ken Cantrell)
Message 1
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| Subject: | "Worn Out" CT-Q67 Cable Assembly (Warning!) |
Dear Listers,
At 170 hours on my RV-8 now, the Prop control had become increasing more difficult
to move starting around 100 hours. The Mixture and Throttle have worked fine
and continue to. All three controls use the standard "Green" control cables
from Vans, typically a "CT-Qxx" part.
A couple of weeks ago, I disassembled the Governor end of the assembly and made
sure that there was no binding or issues on that end. I even lightly lubed up
the various moving bits. Yesterday, the Prop control became so difficult to
move that I had trouble cycling the prop during run up. I pulled the whole throttle
quadrant installation apart today to have a look. I got the cable completely
out of the airplane and there are NO outward signs of wear or abuse of
*any kind*. But even with the cable completely out of the plane and nothing
connected to either end, it is almost impossible to move the cable!! I have a
new CT-Q67 cable assembly for my front-mounted governor installation and I'm
going to install that next.
But, I wanted to give everyone a heads up on these CT-Q controls. These things
are built like they go on a Caterpillar Tractor, so I can't figure out why they
would wear out like this.
If one of these controls starts getting stiff and tight, its probably not going
to get any better. Replace it before it becomes a safety issue! Not a big deal
on the Prop control, but on a throttle or mixture it could be a serious concern.
Best regards,
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours Total Time Since May 2 2010 Test Flight!
Message 2
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| Subject: | "Worn Out" CT-Q67 Cable Assembly (Warning!) |
Matt,
I had a similar experience with my prop cable and talked to my local A&P. He
suggested the following:
Take a short piece of rubber tubing with an I.D. the same as the O.D. of the
prop cable.
Slip it over the disconnected cable (governor end) and put a small hose
clamp on it to make it a snug fit.
Spray some Gunk spray lube in the short piece of rubber tubing. Hold the end
up so a small amount of liquid lube is in the tubing.
Take your compress air supply and spray it into the end of rubber tubing,
holding it tight in your hands; forcing the lube into the prop cable
housing.
Be sure to put a rag around the other end to avoid a big mess.
I did this and my prop cable operates like new now.
Ken Cantrell
RV-6, 1054 hours.
-----Original Message-----
From: owner-rv-list-server@matronics.com
[mailto:owner-rv-list-server@matronics.com] On Behalf Of Matt Dralle
Sent: Sunday, April 17, 2011 3:23 PM
Subject: RV-List: "Worn Out" CT-Q67 Cable Assembly (Warning!)
Dear Listers,
At 170 hours on my RV-8 now, the Prop control had become increasing more
difficult to move starting around 100 hours. The Mixture and Throttle have
worked fine and continue to. All three controls use the standard "Green"
control cables from Vans, typically a "CT-Qxx" part.
A couple of weeks ago, I disassembled the Governor end of the assembly and
made sure that there was no binding or issues on that end. I even lightly
lubed up the various moving bits. Yesterday, the Prop control became so
difficult to move that I had trouble cycling the prop during run up. I
pulled the whole throttle quadrant installation apart today to have a look.
I got the cable completely out of the airplane and there are NO outward
signs of wear or abuse of *any kind*. But even with the cable completely
out of the plane and nothing connected to either end, it is almost
impossible to move the cable!! I have a new CT-Q67 cable assembly for my
front-mounted governor installation and I'm going to install that next.
But, I wanted to give everyone a heads up on these CT-Q controls. These
things are built like they go on a Caterpillar Tractor, so I can't figure
out why they would wear out like this.
If one of these controls starts getting stiff and tight, its probably not
going to get any better. Replace it before it becomes a safety issue! Not
a big deal on the Prop control, but on a throttle or mixture it could be a
serious concern.
Best regards,
Matt
-
Matt Dralle
RV-8 #82880 N998RV
http://www.mattsrv8.com - Matt's RV-8 Construction Blog
http://www.youtube.com/MattsRV8 - Matt's RV-8 HDTV YouTube Channel
Status: 170+ Hours Total Time Since May 2 2010 Test Flight!
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