f1boss(at)gmail.com
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 Posted: Mon Apr 18, 2011 4:45 am Post subject: RV-List Digest: 2 Msgs - 04/17/11 |
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| Quote: | ________________________________ Message 1 _____________________________________
Time: 03:26:28 PM PST US
From: Matt Dralle <dralle(at)matronics.com (dralle(at)matronics.com)>
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
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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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Hey Fellas:
I have seen this too many times - looks like heat is the killer. Move the cables away from the killer exh system, then you can wrap the cables with spark plug wire insulation - - a smaller version of the normal hose type heat protective stuff. Lube will not work, as the nylon inner wrap is balled around the wire - hanging on for dear life! If this persists, you can try the 920 cables from ACS, or buy replacement cables from Cablecraft - certified stuff, thus very expensive.
Carry on!
Mark
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