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  #1  
Old 03-06-2015, 07:45 AM
Ivan Kristensen's Avatar
Ivan Kristensen Ivan Kristensen is offline
 
Join Date: Mar 2008
Location: Guelph Ontario
Posts: 267
Default RV-10 Maintenance alert!

During regular maintenance I noticed that the flange, holding the 4" scat hose for the oil cooler, was cracking. The cracking had extended 3/4 of the way around and needed immediate attention. This obviously has potential serious consequence should it break off all together.

Now in defense of the original Vans part I had installed an "after market" butterfly valve to control the airflow from the cockpit. This obviously caused additional weight and stresses on this flange from engine vibration and is likely the reason that the weld of the flange cracked.

A better solution to this problem might be to mount the butterfly valve on the Oil cooler, this would isolate it from the engine vibrations.

The pictures below will tell the story and show the fix.










My long time friend and repeat RV offender Roy Pinner helped me with parts and tools for this repair. Thanks Roy! It was on my way back from his place, just before dark over central Florida, I snapped the picture below.
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Ivan Kristensen
Guelph, ON. Canada
RV-10 (C-GMDV) 1355hrs.
Dual GRT 8.4" HXr EFIS, VP-200, TT A/P, Avidyne IFD440, uAvionixX ADS-B out, Sky Radar WX and Traffic, Dual EI's (one Lightspeed & one SDS CPI)

RV-14A under construction.

Link to my build site:
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  #2  
Old 03-06-2015, 08:05 AM
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Bill.Peyton Bill.Peyton is offline
 
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Default

Thanks Ivan. I will check it today
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  #3  
Old 03-06-2015, 08:16 AM
GTWreck GTWreck is offline
 
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Location: Locust Grove, GA
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Default

I had much the same thing and noticed it before my first flight. I too use the butterfly valve, but mine is mounted at the bottom (on the oil cooler bracket on the firewall). The 4" flange that I used which is mounted to the baffles had a couple spot welds around the perimeter. As I was triple checking that everything was good and tight, I managed to break on of the welds just by pulling on the scat tube.

My fix was very similar (small angle bracket screwed into the baffle and 4" flange).
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  #4  
Old 03-06-2015, 08:45 AM
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rleffler rleffler is offline
 
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Default

I recently did that check and didn't find anything, but my butterfly is mounted to the oil cooler.

Thanks for bring this to everyone's attention.

bob
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  #5  
Old 03-06-2015, 05:23 PM
aerhed aerhed is offline
 
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Location: Big Sandy, WY
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If I'm thinking right those are only tack welded in four places.
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  #6  
Old 03-06-2015, 05:44 PM
gasman gasman is offline
 
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Location: Sonoma County
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Looks like your scat is in contact with the motor mount causing vibration to transfer to the flange. I expect it to still have problems.
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  #7  
Old 03-06-2015, 06:45 PM
g zero g zero is offline
 
Join Date: Jun 2007
Location: palm coast fl.
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Default Alert

I think a good bead of Pro Seal would help prevent this , it would dampen some vibration .
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  #8  
Old 03-07-2015, 05:27 PM
Ivan Kristensen's Avatar
Ivan Kristensen Ivan Kristensen is offline
 
Join Date: Mar 2008
Location: Guelph Ontario
Posts: 267
Default Scst tubing

Quote:
Originally Posted by gasman View Post
Looks like your scat is in contact with the motor mount causing vibration to transfer to the flange. I expect it to still have problems.
Yes the the Scat does come very close to the motor mount. As you can see I have a piece of hard plastic tubing RTV'ed to the mount to prevent chafing.

I regard what I did as a permanent fix but I think in a new installation I would place the butterfly valve on the oil cooler.
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Ivan Kristensen
Guelph, ON. Canada
RV-10 (C-GMDV) 1355hrs.
Dual GRT 8.4" HXr EFIS, VP-200, TT A/P, Avidyne IFD440, uAvionixX ADS-B out, Sky Radar WX and Traffic, Dual EI's (one Lightspeed & one SDS CPI)

RV-14A under construction.

Link to my build site:
https://ivankristensen.smugmug.com/B...ENTAL-aircraft
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  #9  
Old 03-07-2015, 07:01 PM
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Bill.Peyton Bill.Peyton is offline
 
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Location: St. Louis, MO
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Checked mine and all is good. I will make the bracket when I return.
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