Today's Message Index:
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1. 02:10 AM - Re: RV7-List: Oil Cooler Mount Cracks - Replacement Follow Up... (Hugh Ragg)
2. 01:34 PM - Re: Oil Cooler Mount Cracks - Replacement Follow Up... (Gordon or Marge)
Message 1
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| Subject: | Re: RV7-List: Oil Cooler Mount Cracks - Replacement Follow Up... |
Nice work, I am very interested in this as my RV7 is almost complete. I looked
at the oil cooler install and will have a very close look at modifying the installation.
Thanks for the valuable feed back
Regards
Hugh
On 25/10/2010, at 10:55 AM, Matt Dralle wrote:
>
> Dear Listers,
>
> First, let me say thanks to everyone that responded to my post regarding the
oil cooler mount cracks. Lots of great feedback; I really appreciate it.
>
> Rather than subject the Oil Cooler's mounts directly to the mounting screw's
tension, I decided to craft some angle brackets that much more evenly distribute
the load over the original mount. I made a set for the front and back of the
rear mount and a single top bracket for the front mount that would sandwich
the Oil Cooler mount to the rear baffle. I very carefully trimmed the tube spacers
to exactly fit between the front and back brackets; much more precisely
than the original installation. The inside rear Oil Cooler mount got the requisite
top and bottom notching to clear the engine mount and this time I hogged
out a bit more to give even better clearance. (A couple of people noted the
scratches on the motor mount near these original notches; I believe these were
from when I was filing the original oil cooler, I got a little over zealous
and scrapped the power coat; I don't believe that there has been any incounters
between the oil cooler and the mount due to engine shake.) I also added a few
more rivets on the flanges between the rear and left-rear baffle sheet metal
pieces.
>
> To absorb some of the engine vibration, crafted a "gasket" of sorts from the
same rubber material the baffle seals are made of. This really seem to nicely
isolate the Oil Cooler from the baffle/engine.
>
> Finally, I crafted a sweet stabilization strut from aluminum tube stock to form
a brace from the engine to the top of the rear engine baffle. This made a
HUGE difference in the overall stiffness of the oil cooler and I'm hoping will
be the final modification in solving this Oil Cooler cracking issue.
>
> Thanks again for all the feedback!
>
>
> -
> 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: 112+ Hours Total Time Since May 2 2010 Test Flight!
> <2010.10.17 - RV-8 - IO-390 Oil Cooler Mount Cracking (1).jpg><2010.10.17 - RV-8
- IO-390 Oil Cooler Mount Cracking (2).jpg><2010.10.24 - RV-8 - Oil Cooler
Replacement And Remounting (1).jpg><2010.10.24 - RV-8 - Oil Cooler Replacement
And Remounting (2).jpg><2010.10.24 - RV-8 - Oil Cooler Replacement And Remounting
(3).jpg><2010.10.24 - RV-8 - Oil Cooler Replacement And Remounting (4).jpg><2010.10.24
- RV-8 - Oil Cooler Replacement And Remounting (5).jpg><2010.10.24
- RV-8 - Oil Cooler Replacement And Remounting (6).jpg><2010.10.24 - RV-8
- Oil Cooler Replacement And Remounting (7).jpg><2010.10.24 - RV-8 - Oil Cooler
Replacement And Remounting (8).jpg><2010.10.24 - RV-8 - Oil Cooler Replacement
And Remounting (9).jpg>
Message 2
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| Subject: | Oil Cooler Mount Cracks - Replacement Follow Up... |
-----Original Message-----
From: owner-rv8-list-server@matronics.com
[mailto:owner-rv8-list-server@matronics.com] On Behalf Of Matt Dralle
Sent: Sunday, October 24, 2010 8:56 PM
Subject: RV8-List: Oil Cooler Mount Cracks - Replacement Follow Up...
Matt: One more thing you might think about. Shorten the spacer tubes
between the flanges to permit an AN washer between the tube ends and the
insides of the flanges. The cooler flanges are pretty soft and the
relatively small contact area of the tube ends may allow the bolt tension to
be lost as the flanges subside under the pressure and vibration.
Gordon Comfort
N363GC
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