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  #1  
Old 11-04-2018, 09:53 PM
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DanH DanH is offline
 
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Location: 08A
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Default Failed Mount Isolators

Engine seemed a bit shaky recently, so today the cowl came off for a look. Problem wasn't hard to find:



The liquid was squeezing from an isolator:



Bring out the wrenches...



These are the bottom isolators. Don't have the top pair out yet. Lord J9613-40, about 830 hours on a 390 with a BA Hartzell.

Looks like the choices are

Lord J9613-40
Lord J9613-49
VIP 50011-20 (=J9613-49)
VIP 50016-09 (acro)
Barry 94011-20 (std)
Barry 94016-08 (acro)

I think Vans is currently selling the VIP 50011-20, but they're not ID'd on the mothership website. What is different about the "acro" VIP 50016-09? Anybody tried the Barry isolators?
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  #2  
Old 11-04-2018, 10:42 PM
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F1Boss F1Boss is offline
 
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Default yes, but...

Sold the Barry parts for a while, but they seemed to go weak (540 ap) a bit faster than expected. Now suggesting the Lord 540/580 Acro mounts. I have no experience with the VIP parts, but I would start with the heavier parts.

I think the 540 parts will fit your setup if you want to try those - I might have a set here? I'll have a look if you want to try 'em.
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  #3  
Old 11-04-2018, 11:26 PM
rv7charlie rv7charlie is offline
 
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Default

Revenge of the Slobovians for that invasion yesterday!


The guy who sold me the O-360 that never made it into my -7 told me about fighting sagging isolators on an aerobatic biplane. Said that they finally cut some delrin bushings that matched the shape of the isolators, and they could barely tell the difference in vibration level.

But that's just something I heard...
:-)

Thanks for coming over, and I hope we can visit Wetumpka sometime soon.

Charlie & Tupper
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  #4  
Old 11-04-2018, 11:51 PM
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RV7A Flyer RV7A Flyer is offline
 
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Default

OK, that looks nasty. Pretty sure there are lots of those isolators out there on RVs (mine included), so what's the root cause here? Did you contact Lord to get any more info?

Definitely something to watch out for at each oil change/decowling. Thanks for posting this.
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  #5  
Old 11-05-2018, 07:08 PM
F1R F1R is offline
 
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Default

Graphic evidence why girls should avoid silicone implants!

Regarding mounts, ACS used to sell "Aerobatic mounts". Externally they looked the same but were firmer.
I tried a set on an 0-320. With the C- 177 /C-172 mounts that the builder had in my AC, I could watch the spinner rise and yaw as the G approached zero near the top of a loop.

The ACS "aerobatic" mounts did prevent the engine from moving as much with change in G loading, however they also transmitted slightly more vibration to the air frame. They are still in service 1700 at hours. YMMV
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  #6  
Old 11-05-2018, 07:46 PM
scsmith scsmith is offline
 
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Yuck! E-yew!

I didn't know there was liquid in them. I suppose its like a spinal disc -- kind of like a jelly doughnut.

Supposedly the aerobatic mounts are a little stiffer, as others have said.
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  #7  
Old 11-05-2018, 08:11 PM
KatanaPilot KatanaPilot is offline
 
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Dan,

I suggest you contact one of the engineers from Lord. I found her very responsive to a mount removal question we had.

Cynthia S. Reid, P.E. // Staff Engineer, Product Support Engineering
LORD Corporation
Telephone // 814-314-2957
Mobile // 814-392-6330
Fax // 814-860-3540

Erie Facility
2455 Robison Road West
Erie, Pa 16509-4675
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  #8  
Old 11-05-2018, 08:56 PM
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RV7A Flyer RV7A Flyer is offline
 
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Quote:
Originally Posted by KatanaPilot View Post
Dan,

I suggest you contact one of the engineers from Lord. I found her very responsive to a mount removal question we had.

Cynthia S. Reid, P.E. // Staff Engineer, Product Support Engineering
LORD Corporation
Telephone // 814-314-2957
Mobile // 814-392-6330
Fax // 814-860-3540

Erie Facility
2455 Robison Road West
Erie, Pa 16509-4675
And please report back what you find out...specifically, the root cause of this failure.
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  #9  
Old 11-05-2018, 10:48 PM
vic syracuse vic syracuse is offline
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Iíve had the same leaking lord mount on the RV-10 at about 900 hours. I replaced all of them. Not cheap.

Vic
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  #10  
Old 11-06-2018, 06:28 AM
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Walt Walt is offline
 
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Quote:
Originally Posted by KatanaPilot View Post
Dan,
Seen this issue before, Lord says no big deal. The fact that most other mounts don't even have this damper I can't imagine its that important, and not worth changing the mounts for.
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