Doha ha ha roger, LORD MOUNTS
Hi George,
I wasn't very clear with my original message. I was referring to the rubber isolation mounts that go between the engine and the engine mount. You make some good points about the engine mount.
Doha! ha ha OK no problem, just replace them with some LORD Corp Mounts,
don't buy cheaper vibration engine mount isolators Van sells in my opinion. I beleive van sells "VIP", Vibration Isolation Products, Inc. d.b.a. Pacific Molded Technologies.
Don't BUY the $60 mounts (vibration elastomeric mounts) from Van. Yes they work, are safe, but the LORD product is far superior even at 60% more the cost. Van always goes for the cheaper discounted stuff. The engine Vib Isolator is a place I don't scrimp on. I think Van should also cary the better LORD mounts. The ones he sells are a third tier brand. Here is a thread on LORD mounts with a post of difference.
POST
DO you have conical? If you do Van DOES sell the LORD conical mounts for $99 each.
Dynafocal? Get the LORD mounts from somewhere else. They cost a little over $100 each. If your vib isolators are 18 years old, replace them, regardless of oil, cracks or sag!
If they are not LORD mounts and you upgrade to NEW LORD mounts you will feel a difference I guarantee it.
The part numbers are:
Dynafocal> J-9613-40 x (4)
[same as the Mooney M20J (1976-up) Lyc. IO-360-A3B6D]
Conical> J-1552 x (8)
[alternative part # J-6230-1 x (4) ? double check call LORD's 877 number)
Any Vib Isolator over say 2000-2500 hrs and/or 12 years, should be replace out right as preventative maintence. They may still hold the engine on the plane but they lose some quality. LORD mounts will last longer. Yea cracks are death, replace for sure.
There's a visual inspection you can do, a certain sag and compression from new that is allowed. If you go to Lord Vibration aviation web page you will find their specs. If in doubt just replace them, it may cost a few hundred but well worth it in lower vibration. (But yours are shot by age and condition)
http://www.lord.com/Home/ProductsSe...n/TheCareofLORDMounts/tabid/3540/Default.aspx
http://www.lord.com/Home/ProductsSe...ntsforGeneralAviation/tabid/3537/Default.aspx