---------------------------------------------------------- RV8-List Digest Archive --- Total Messages Posted Mon 10/25/10: 2 ---------------------------------------------------------- Today's Message Index: ---------------------- 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 _____________________________________ Time: 02:10:20 AM PST US Subject: RV8-List: Re: RV7-List: Oil Cooler Mount Cracks - Replacement Follow Up... From: Hugh Ragg 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 _____________________________________ Time: 01:34:45 PM PST US From: "Gordon or Marge" Subject: RE: RV8-List: 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv8-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV8-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/rv8-list Browse Digests http://www.matronics.com/digest/rv8-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.