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11-15-2011, 04:26 PM
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Join Date: Apr 2008
Location: Davenport, IA
Posts: 1,390
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Condition Inspection Item - Radiator Hose Abrasion
Working on the Condition Inspection. See the photo. The hose from the top of the radiator to the reservoir is resting on the engine mount and abrading. You can see the rubber smudges on the mount. Maybe a mil is worn on the underside of the radiator line.
Some type of clamp will be required to hold the hose in position. Ideas?
And before anyone notices, I had to remove the engine mount bolt on the left/top to relieve the washer, as it was in contact with the mount as mentioned in a previous post. The top/right was OK. The two bottom washers are close but also OK.
Last edited by MartySantic : 11-15-2011 at 04:29 PM.
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11-15-2011, 06:37 PM
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Join Date: Apr 2010
Location: Ridgeland, SC
Posts: 2,589
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my .02 cents--
make a stand-off bracket to keep a NEW hose from contacting anything. If you allow something like a hose, or a piece of tubing to rub itself on a engine mount tube, it "could" wear enough to weaken the mount in that area. I'm not saying it will, 'cause I wouldn't want to find out. Least that could happen is wear a hole in a hose. Worst---I dont want to go there-----
Tom
__________________
Tom Swearengen, TS Flightlines LLC, AS Flightlines
Joint Venture with Aircraft Specialty
Teflon Hose Assemblies for Experimentals
Proud Vendor for RV1, Donator to VAF
RV7 Tail Kit Completed, Fuse started-Pay as I go Plan
Ridgeland, SC
www.tsflightlines.com, www.asflightlines.com
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11-15-2011, 06:58 PM
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Join Date: Feb 2005
Location: Huskerland, USA
Posts: 5,862
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Stand off or add a little RTV and stick the hose to it and let it cure.
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RV-7 : In the hangar
RV-10 : In the hangar
RV-12 : Built and sold
RV-44 : 4 place helicopter on order.
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11-16-2011, 06:33 AM
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Join Date: Aug 2005
Location: Jeffersonville, IN
Posts: 463
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The subject of engine mounts and things touching them has been a big topic of discussion on VAF and amongst several builder buddies.
I know the judges at OSH this year were very sensative to tie wraps directly attached to the engine mount (like the white one behind the black hose in the pic). We can go round and round about it. I concluded (pre-OSH) it wasn't a big deal since I would be checking it fairly often. I then decided to change it because the judges said the FAA is being very headstrong about it not being an acceptable "technique."
I went to the Lowe's/Home Depot aviation store and picked up some clear tubing that had the same inside diameter as the engine mount's outside diameter. Then I used the tie wraps for securing, standoffs, etc as normal. It looks great and it will definitely hard cushion the mount so the ties don't "saw" or "eat" into the mount (maybe just into the tube -- yet TBD). That would be my suggestion, but like everything else, you'll get 10 suggestions and you have to figure out what you'll be happy with. Dave
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11-16-2011, 07:11 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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I have this "problem," if it is a problem. At the suggestion of VAF, I went up and over the right-angle oil filter. It's impossible to take that route and NOT rub against the engine mount. A stand-off in this configuration does not seem entirely possible because it would require about a 1" clearance once everything is installed, you could only lift the hose higher, and that's going to put a kink in the hose itself. Note on the left side after it clears the oil filter that there is a stand-off with the engine mount.
The hose is "pinched" (with acceptable diminishing of the hose diameter) with the oil filter.
What if I just wrap a bunch of electrical tape around the engine mount there and let it rub against that and just change it -- if need be -- at oil change time?
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11-16-2011, 07:13 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Quote:
Originally Posted by db8
I went to the Lowe's/Home Depot aviation store and picked up some clear tubing that had the same inside diameter as the engine mount's outside diameter. Then I used the tie wraps for securing, standoffs, etc as normal. It looks great and it will definitely hard cushion the mount so the ties don't "saw" or "eat" into the mount (maybe just into the tube -- yet TBD). That would be my suggestion, but like everything else, you'll get 10 suggestions and you have to figure out what you'll be happy with. Dave
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I did something similar when tying up the blast tube from the back of the baffling to the magneto. I had a piece of firesleeve so I cut it, wrapped it around the engine mount and tie-wrapped it to that.
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11-16-2011, 07:22 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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I like to use Uni-Wrap silicone tape for preventing chafing, it's high temp, bonds to itself and long wearing. I will not tie wrap directly to engine mount without some silicone tape around the mount.
http://www.aircraftspruce.com/catalo...es/uniwrap.php
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
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RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
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11-16-2011, 07:35 AM
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Join Date: Jan 2005
Location: St. Paul, MN.
Posts: 4,792
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Awesome, Walt! I'm adding that to my cart. Thanks!
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11-16-2011, 07:46 AM
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Join Date: Mar 2005
Location: Chandler, Arizona
Posts: 188
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Clamp...
A simple blob of high quality silicon will hold them in place and stop the chaffing? It is highly effective, and inexpensive. It doesn't look bad either if you do it cleanly? its a good idea for holding a lot of wires and hoses in place so they don't vibrate or rub when there isn't room for a clamp?
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11-16-2011, 07:55 AM
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Join Date: Aug 2010
Location: Marshall TX (KASL)
Posts: 1,783
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Wal-Mart has this stuff called "rescue tape" - peel-and-stick- it is mentioned in several other posts. It sticks to itself, not to other stuff, and cures tough. I wrap it around the motor mounts and put tie-wraps over it, not on the bare mount.
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