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1. 06:54 AM - Re: Oil Cooler Mount Cracking... (Dan Bergeron)
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| Subject: | Re: Oil Cooler Mount Cracking... |
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 <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!
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