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09-12-2011, 07:37 PM
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Join Date: Aug 2011
Location: Seattle
Posts: 104
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question on engine shock mounts
How often should one replace the elastometric shock mounts on an engine installation? Mine are the 'Lord' type, 22 years old, with 650 hours on my RV3. I'm going to pull the engine off to do some magneto work soon, and wondered if I should replace the shock mounts while I'm at it?
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09-12-2011, 08:33 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,668
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I would, normally they are replaced at TBO, I think 22 years qualifies as TBO.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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09-13-2011, 08:43 AM
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Join Date: Aug 2006
Location: Battle Ground, WA
Posts: 426
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Replace engine isolators?
Quote:
Originally Posted by highflight42x
How often should one replace the elastometric shock mounts on an engine installation? Mine are the 'Lord' type, 22 years old, with 650 hours on my RV3. I'm going to pull the engine off to do some magneto work soon, and wondered if I should replace the shock mounts while I'm at it?
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Yes. Be sure to bite the bullet ($$$-wise) and get the actual Lord mounts. The <$ competitors eliminated the silicone gel guts in order to lower the price. This is definitely a case where one gets what one pays for. I shopped around and remarkably enough got the best price from Jeppeson (!???!).
LarryT
Larry Tompkins
N544WB RV-6A purchased flying
W52 Battle Ground, WA |
09-13-2011, 08:45 AM
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Join Date: Jun 2006
Location: 8I3
Posts: 3,562
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If they're not heat checked and not excessively stretched, I'd leave them alone. $500 for mounts saved can buy a lot of gas. Well maybe not so much anymore.
That said I rub mounts with DC4 to keep them from drying out.
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Bob Japundza CFI A&PIA
N9187P PA-24-260B Comanche, flying
N678X F1 Rocket, under const.
N244BJ RV-6 "victim of SNF tornado" 1200+ hrs, rebuilding
N8155F C150 flying
N7925P PA-24-250 Comanche, restoring
Not a thing I own is stock.
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09-13-2011, 09:08 AM
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Join Date: Sep 2008
Location: California
Posts: 697
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The Sac Sky Ranch manual has a diagram with allowable limitis of stretch and sag. Might be a good guide for your decision. Mine are 15 years old and sagging pretty bad. If not too bad you might consider flipping top to bottom or adding spacers to the lowers to bring it back up where it shoud be. Both suggestions I got from knowledgeable folks in the business.
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09-13-2011, 09:48 AM
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Join Date: Jan 2005
Location: 57AZ - NW Tucson area
Posts: 10,011
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The Lord manual is here -
http://www.herberaircraft.com/pdf/Di...ide_PB6304.pdf
Inspect them per the numbers above...
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Gil Alexander
EAA Technical Counselor, Airframe Mechanic
Half completed RV-10 QB purchased
RV-6A N61GX - finally flying
Grumman Tiger N12GA - flying
La Cholla Airpark (57AZ) Tucson AZ
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09-14-2011, 12:20 AM
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Join Date: Aug 2011
Location: Seattle
Posts: 104
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Great answers, guys. I shall consider all the advice given! Thanks -
- Steven
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09-14-2011, 12:39 AM
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Join Date: Dec 2006
Location: Kalifornia
Posts: 466
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