Today's Message Index:
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1. 01:25 PM - Re: Oil Cooler Mount Cracking... (Richard Martin)
2. 06:01 PM - Oil Cooler Mount Cracks - Replacement Follow Up... (Matt Dralle)
Message 1
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| Subject: | Re: Oil Cooler Mount Cracking... |
Chris,
The reason for the recommendation for a call is because the answer would
require a very long and detailed post. Call me. 920 619 6968 (cell).
Dick Martin
RV8 N233M
the fast one
On Mon, Oct 18, 2010 at 8:55 AM, Chris Stone <rv8iator@earthlink.net> wrote:
>
> Dick...
>
> I am about to install an oil cooler on my RV-8. I would be interested in
> your experiences and solutions to the cracking problem.
>
> I am under the impression that this list is for the sharing and
> dissemination of experience and information,. If it is used as message
> board for offline communications then the benefits of this forum are lost.
>
>
> Chris Stone
> RV-8
> Newberg, OR
>
>
> Mat, call me @920 619 6968. I experienced the same problem 2500 hours ago
> when I first flew my RV8 (serial no. 2). I can explain in detail how and
> what to do.
> Dick Martin
> RV8 N233M
> the fast one
>
>
> On Sun, Oct 17, 2010 at 9:10 PM, Matt Dralle <dralle@matronics.com> 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!
>
>
Message 2
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| Subject: | Oil Cooler Mount Cracks - Replacement Follow Up... |
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!
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