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  #1  
Old 01-29-2012, 09:06 PM
Russ McCutcheon's Avatar
Russ McCutcheon Russ McCutcheon is offline
 
Join Date: Oct 2005
Location: Vancouver, WA USA
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Thumbs down Zip Ties on engine mounts, don't do it!

Ok guys maybe this has been covered before. I just did some repair work on an old early 80s RV-4 engine mount, the right tube that comes up from the top of the gear leg socket to the bottom of the engine was broken thru and had all the paint polished off, it had absolutely no deformation, not flexing or bent, the same tube on the other side was cracked also, about 2" above the weld, well out of the heat affected zone, right where a zip tie had worn thru the paint and you could see it had abraded the tube right where the crack had formed, the surface of the tube looked like it had been work hardened promoting the crack.

My old -4 has a bunch of zip ties on the engine mount too, I will be inspecting and eliminating these before further flight!
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  #2  
Old 01-29-2012, 09:10 PM
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Russ McCutcheon Russ McCutcheon is offline
 
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Default

P.S his engine mount was painted black, makes finding cracks nearly impossible!
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  #3  
Old 01-29-2012, 09:36 PM
Captain Avgas Captain Avgas is offline
 
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Default

I used only blue Tefzel zip ties FWF. Mainly I used Adel clamps on the engine mount to support wiring. But when I used a zip tie I wrapped the mount with self fusing silicon Rescue Tape. You will see that I also used it on the wire to stop the zip tie chewing through the wire insulation.

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  #4  
Old 01-29-2012, 10:34 PM
BruceP BruceP is offline
 
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Default Where...

do you get the self fusing silicone tape?
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  #5  
Old 01-29-2012, 10:40 PM
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RV7Guy RV7Guy is offline
 
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Default Here ya go!!!

I only use zip ties over the Uni Wrap.
http://www.aircraftspruce.com/catalo...es/uniwrap.php
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  #6  
Old 01-29-2012, 10:53 PM
jbDC9 jbDC9 is offline
 
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Quote:
Originally Posted by BruceP View Post
Where do you get the self fusing silicone tape?
I found it at a local Ace Hardware, brand name is Rescue Tape.
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  #7  
Old 01-29-2012, 10:54 PM
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N941WR N941WR is offline
 
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I'm a BIG fan of using Adel clamps as you can see in these pictures;
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  #8  
Old 01-29-2012, 11:14 PM
Steve Barnes Steve Barnes is offline
 
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Location: Santa Rosa, CA
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Default Thanks Russ

I am glad you started this thread, because I was going to start this exact thread tomorrow. I am helping John the owner of the 1986 RV4 that you are referring to. I was very surprised to see the tie wrap on top of the crack. It was tight and did not seem to be vibrating or moving that much. I will immedately inspect mine now and replace with either anti chaffe tape underneath the tie wraps or use adel clamps. I will also inform all the RV owners that I know of the problem. I believe that that the subject plane only has a little over 1000 hours on it.


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  #9  
Old 01-29-2012, 11:39 PM
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rv6rick rv6rick is offline
 
Join Date: Apr 2005
Location: Chesapeake Bay
Posts: 747
Default Great Safety Topic

Thread moved from 'RV General Discussion/News' to 'Safety'.

I've seen many engine installations on RV's and my personal observation is that the majority of builders use tie wraps to secure wire/other to their engine mount. I'll admit that I was sceptical of the tie wrap cutting through the engine mount until I saw one with my own eyes. Thanks for starting the thread, I hope folks take another look at their installs and make corrections if/where needed.

I'll put my Oshkosh Judges hat on for a moment, for those displaying their hard work for the Judges at Oshkosh.....you WILL get a deduction for using tie wraps on your engine mounts.

Bill R's pics show a nice alternative to tie wraps and some very clever use of adel clamps. I'm sure he knows there are still a few tie wraps on his install but I'll bet they'll be replaced with clamps the next time his cowls come off. Thanks for sharing your pics Bill!




Quote:
Originally Posted by N941WR View Post
I'm a BIG fan of using Adel clamps as you can see in these pictures;
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  #10  
Old 01-30-2012, 05:38 AM
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plehrke plehrke is offline
 
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Quote:
Originally Posted by rv6rick View Post
I'll put my Oshkosh Judges hat on for a moment, for those displaying their hard work for the Judges at Oshkosh.....you WILL get a deduction for using tie wraps on your engine mounts.
I used quite a few tie wraps when I built the plane. First year at OSH I was there when several judges were looking at my plane and I overheard them discussing the tie wraps. Over the last several years, during my conditional inspection, I have change over the tie wraps to adel (not the singer) clamps, switch the ones on the engine mounts first. I now have no tie wraps and it looks great and no worries of inspecting under the tie wraps every year. Big help was getting a good tool. They are a snap to put in with this.
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Last edited by plehrke : 01-30-2012 at 05:41 AM.
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