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Matt Dralle
Site Admin
Joined: 08 Nov 2005
Posts: 25704
Location: Livermore CA USA
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 Posted: Sun Oct 17, 2010 6:14 pm Post subject: Oil Cooler Mount Cracking... |
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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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dsvs(at)ca.rr.com
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| Posted: Sun Oct 17, 2010 7:26 pm Post subject: Oil Cooler Mount Cracking... |
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Matt,
Yes you can get the cooler flang fixed at Pacific Oi Cooler. You should
think about tying the cooler to the engine to avoid the shakes breaking the
baffles and flanges. One other thing I see that will bite you in the long
run is the use to fubeing as spacers. If you do this it will need steel
washers at each end or it will eventually lead to additional cracks. Trim
the tubes by the thickness of two full thickness washers and install one at
each end. If you mount the cooler to the firewall expect a reduction in
cooling as the four inch flex tube has a smaller area than your current
opening.
--
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yenduc(at)me.com
Guest
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| Posted: Sun Oct 17, 2010 8:50 pm Post subject: Oil Cooler Mount Cracking... |
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I angled a brace from the oil cooler mount across to the center seam
of the engine block where the engine lift loop is mounted. It took
the vibration out of the oil cooler mount and no cracks so far (210
hours).
On Oct 17, 2010, at 7:10 PM, Matt Dralle wrote:
Dave(at) RAL
| Quote: | 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! <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>
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jgiallo(at)mindspring.com
Guest
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| Posted: Sun Oct 17, 2010 9:58 pm Post subject: Oil Cooler Mount Cracking... |
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Matt,
In addition to the washers at either end of the aluminum spacer tubes I
also have a piece of 0.125 aluminum angle running from the inboard oil
cooler mounting point (top, inside the baffles) to the center of the
engine. Essentially you can move the entire aircraft using the oil
cooler - this is the "strong enough" test....see the enclosed picture -
so far so good.
Regards,
Joe
N813MJ 100hrs
Matt Dralle wrote:
| Quote: | 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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dan.pat.b(at)gmail.com
Guest
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| Posted: Mon Oct 18, 2010 5:54 am Post subject: Oil Cooler Mount Cracking... |
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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(at)matronics.com> wrote:
| Quote: |
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!
|
| | - The Matronics RV7-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV7-List |
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