rubber engine mount

[N99LY]

trying to get the mount number of either a berry or lord mount. The current mount has no model number. The mount is 2.25" across and 3/4" high with a 1/2" shoulder. Any one know what model? Manufacturers have been no help. Manufactures only show height not width. Sure the engine mount is an older style. 

[Kent Ashton]

Generally,  Lord J7402-24 is recommended for the Cozy.  That's what the Cozygirrls show.  If you look at the Lord manual you will see -24 and -16 listed for Pipers PA-28s between 150 and 180 hp so  I don't think it matters much which one   I think there is subtile differences in the rubber composition.  Doubt you could tell in use.

https://www.lord.com/china/sites/china/files/PB6304_MountsGeneralAviation.pdf

 

[Kent Ashton]

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[You said:}  I can find thickness and engine cross references but have not been able to find diameter dimensions on any mounts. Some newer mounts have been the 3" wide and the 2.75" diameter, all have been 3/4" thick for a o-320 but I have a 2.25" wide and trying to find the model for this size is tough. I started with the Barry mount for the 0-320 but the rubber disc to the engine mount is too large around. Both Lord and Barry are no responsive and ACS is reluctant to start pulling boxes apart  to examine sizes.

I see that you have a Long-ez.  I measured the cups on a standard Dynafocal Type 1 ring and they are 2.75" ID.  Does your "2.25" refer to the cup-size or the donut diameter?   In the picture below, the gent is showing a Lord J-7402-24 donut in an O-360 mount.      http://www.supercub.org/forum/showthread.php?46285-NEED-INFO-on-engine-mounts    The donut appears to be about 2.25" wide.  The engineering sketch below shows them to be about 2" wide.  Maybe this is what you are seeing and what you want (or the -16).

The Cozygirrls recommend the Lord J-7402-24 for their Long-ez mounts.  http://www.cozygirrrl.com/aircraftparts.htm   Here is a conversation about donuts from the Cozybuilders group:  

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I just spoke with a tech rep at Lord and here is what he said:  The Lord J-7402-24 rubber isolators (which is $105 at ACS and recommended for the CG Parts steel engine mount) are slightly different from J-7402-16 (which -16 is the same as part as VIP 50401-300 which is $49 each from the manufacturer at (562) 865-9200) in that the -24 has extra rubber around the spacer which is good ONLY for engine start up and shut down to reduce vibration for close fitted cowlings.  There is no difference in performance from -24 and -16 in flight.  So the VIP part number would be sufficient for me at more than ½ off ($200) versus the ACS price of $440.  As for torque, a 7/16^th bolt (AN7) has a torque range of 450-500 in-lb, so the rep said that that is the magic number and to make sure that the two big washers actually contact the steel spacer on both sides.  Enough on this subject.

 The VIP donuts are cheaper.   https://vipmounts.com/aircrafts-mounts/   See bottom of the page for Lord/Barry equivalents.

I have read of an alarmed owner who saw the interior rubber piece around the space on the -24 donuts deteriorating and "leaking" out of the donut.  So since the -24 extra rubber feature is unnecessary and the -16 is the same in flight, I would guess the -16 version or VIP equivalent would do.  There is an older Lord product guide here which has more info and drawings.  http://www.n2999c.com/N2999C-info/aircraft/Skyranch_Information/enginemount_lord.pdf

 That empties my clue bag.  🙂

Lord mount S-4258.pdf

Edited May 13, 2019 by Kent Ashton