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teamgrumman(at)YAHOO.COM
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 Posted: Sat Aug 28, 2010 9:44 am Post subject: Engine mount vibration isolators |
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Got a question for which I haven't a clue.
Look at the pics. These Lord mounts were installed new in 2008 along with a Lycoming Reman engine. Total engine time is 310 SFRM. i.e., 310 since install. I looked all over for cracks on the engine mount.
Any suggestions?
First pic is a weird angular wrinkle on the upper left mount.
Second pic is the lower right mount.
Third pic is the lower left mount.
The upper right mont was the only one that looked normal.
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flyadive(at)gmail.com
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| Posted: Sat Aug 28, 2010 5:43 pm Post subject: Engine mount vibration isolators |
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Gary:
I do not understand what yu are talking about. Could you put some arrows to the areas that you have concern about?
Pics #1 & #2 the rubber part is showing signs of cracking - It there dry rot?
Pic #3 it looks like the spacer washers are being adsorbed into the rubber. Are they the proper size? Is the rubber shifting?
They just don't look right.
Barry
On Sat, Aug 28, 2010 at 1:42 PM, Gary Vogt <teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)> wrote:
[quote] Got a question for which I haven't a clue.
Look at the pics. These Lord mounts were installed new in 2008 along with a Lycoming Reman engine. Total engine time is 310 SFRM. i.e., 310 since install. I looked all over for cracks on the engine mount.
Any suggestions?
First pic is a weird angular wrinkle on the upper left mount.
Second pic is the lower right mount.
Third pic is the lower left mount.
The upper right mont was the only one that looked normal.
[b]
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teamgrumman(at)YAHOO.COM
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| Posted: Sat Aug 28, 2010 7:59 pm Post subject: Engine mount vibration isolators |
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I bought these mounts new from Fletcher in 2009 (as it turns out, not 2008) and installed them along with the new engine. I've never seen this degree of deterioration so quickly.
The wrinkled mount, well, I can not explain that one. It looks to me like the isolator was twisted while it was hot and deformed. The others just look like 20 year old mounts. I was hoping someone would say, "The bolts are too short." or something that I could have missed. I wish I knew what to tell the owner.
From: FLYaDIVE <flyadive(at)gmail.com>
To: teamgrumman-list(at)matronics.com
Sent: Sat, August 28, 2010 6:43:02 PM
Subject: Re: Engine mount vibration isolators
Gary:
I do not understand what yu are talking about. Could you put some arrows to the areas that you have concern about?
Pics #1 & #2 the rubber part is showing signs of cracking - It there dry rot?
Pic #3 it looks like the spacer washers are being adsorbed into the rubber. Are they the proper size? Is the rubber shifting?
They just don't look right.
Barry
On Sat, Aug 28, 2010 at 1:42 PM, Gary Vogt <teamgrumman(at)yahoo.com (teamgrumman(at)yahoo.com)> wrote:
| Quote: | Got a question for which I haven't a clue.
Look at the pics. These Lord mounts were installed new in 2008 along with a Lycoming Reman engine. Total engine time is 310 SFRM. i.e., 310 since install. I looked all over for cracks on the engine mount.
Any suggestions?
First pic is a weird angular wrinkle on the upper left mount.
Second pic is the lower right mount.
Third pic is the lower left mount.
The upper right mont was the only one that looked normal.
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[quote][b]
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bob.hodo(at)YAHOO.COM
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| Posted: Sat Aug 28, 2010 9:23 pm Post subject: Engine mount vibration isolators |
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I like that there are experts of all kinds in the Grumman family, and as something of an expert in things 'rubber' I feel like I am letting you down.
AFAIK lord engine mounts are a cured "rubber" compound not unlike that in tires, except that they have no plies or cords in them of any kind. The curing process leaves them in a state similar to the heat treating of metal, that is, it gives but bounces back. The cracking seen in two of them suggests age or heat or both. But what appears to be twist in that one is very puzzling to me. It is almost as if there had been a wire tightened around it long enough and tight enough to permanently deform it.
As for the cracking, rubber is blended from many compounds, just like making a cake. It is not unusual for a batch to get contaminated with an extra glob of this or that. At Goodyear, we could not use even one skid of rubber until 8 to 10 samples from it had been tested in the lab, and we went through 40 or 50 skids per shift on the wire and fabric calender.
I think I would send them to Lord and ask what they think the problem was.
Bob Hodo
[quote][b]
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