---------------------------------------------------------- RV7-List Digest Archive --- Total Messages Posted Mon 10/18/10: 1 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 06:54 AM - Re: Oil Cooler Mount Cracking... (Dan Bergeron) ________________________________ Message 1 _____________________________________ Time: 06:54:46 AM PST US Subject: Re: RV7-List: Oil Cooler Mount Cracking... From: Dan Bergeron MATT: NOT SURE - BUT LOOKING AT BOTH YOUR PICTURES IT LOOKS LIKE THE OIL COOLER FLANGE HAS BEEN HITTING THE ENGINE MOUNT TUBES. I NOTICED WHAT APPEARS TO BE AN ABRASION MARK WHERE THE OIL COOLER FLANGE (ON THE RIGHT AS YOU LOOK AT THE PICTURE) HAS BEEN IN CONTACT WITH THE UPPER MOUNT TUBE AND POSSIBLY WITH THE LOWER LOOKING MOUNT TUBE AS WELL. IF THAT HAS BEEN HAPPENING IT WOULD HAVE PUT A LOT OF STRESS ON THOSE FLANGES. GOOD LUCK. DAN BERGERON RV-7A N307TB 198 HOURS SINCE FIRST FLIGHT ON 08/06/99 On 10/17/10, Matt Dralle wrote: > > Dear Listers, > > I took the cowling off the 'ol RV-8 today to have a look around at about the > 112 TTSN hour mark. Most everything looked okay except for one major issue. > The outside, lower back mount on the oil cooler is totally cracked off. > The outside, lower front mount also has a long crack. At this point, the > upper part of the mount seems alright. Also the inside mounts show no signs > of cracks. The rear flange on the baffling has a small crack where the left > rear part rivets to the back baffle that the oil cooler is bolted to. No > oil leaks of any kind at this point. See attached pictures from my Cell > Phone. > > So what the heck? The engine shakes quite a bit on startup and shutdown > (smooth as glass during normal ops), but this doesn't really seem like > rotational shake damage. Although, it must be. Obviously I'm going to have > to remove the oil cooler and have it repaired (that can be done, right?). > But just "fixing" the mounting flanges isn't going to solve the "problem". > > What are lister's opinion on what's going on here and what could be done to > prevent it? > > Interestingly, I noted that the #4 grounding cable that is attached to a > bolt hole right underneath the oil cooler also had the lug sheered off. > There is "service loop" on the cable, but #4 isn't really flexible so its > not particular effective. Guess I need more. The point though, is, that it > seems like the engine shook pretty hard. I don't see any other signs of > "issues" related. The mounts and bolts seem solid and tight. > > Thoughts? > > > - > 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 TTSN! ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message rv7-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/RV7-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/rv7-list Browse Digests http://www.matronics.com/digest/rv7-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.