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1. 12:31 AM - Re: Re: Engine mount rubbers - YAK-50 (Jan Mevis)
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| Subject: | Re: Engine mount rubbers - YAK-50 |
Thanks George,
Actually we never had any problems with the original mounts either, not
even with an M14R bolted on the plane.
Good website!
Jan
On 05/08/2017, 18:29, "George S. Coy" <owner-yak-list-server@matronics.com
on behalf of george.coy@gmail.com> wrote:
>
>Hey Guys, I am not sure where the problem is with the good old rubber
>mounts. Worked pretty well for the last 60 years or so.
>I suspect many or the problems are caused by self-induced.
>
>First, rubber has a shelf life as well as a use life. If you are
>installing
>"New" rubber mounts that were produced in 1994, then you will have
>problems.
>
>
>Second, the M14P instillation calls for 14 of 506400-05 mounts and 2 of
>the 5064000-35 mount. (the -35 parts go behind the magnetos and have a
>slightly smaller metal bonded face to prevent interference with the
>magnetos). It also calls for a specific washer (50640002) by the mount
>face
>that must be installed with the curved face to the mount. There is a
>second
>oblong washer (506400-03) under other end of the mount assembly.
>
>Third, there is a specific dimension (34.6 mm) between the face of the
>motor mount and the top of the -35 washer under the nut end of the
>assembly.
>The nuts are tightened to a dimension , not a specific torque. Over
>tightening and or under tightening will cause problems as well.
>
>We offer new rubber mounts made within the last year, as wells the proper
>washers. These mount sets are priced competitively.
>
>I am not a big fan of the DRE ( Direct Rectal Extraction) engineering
>method, so tend to stick with the original system that has worked well.
>
>You can find an instillation diagram with all the part numbers on our
>website.
>
>
>George Coy
>MotorstarNA
>714 Airport Rd.
>Swanton VT 05488
>802-868-5633 off
>802-363-5782 cell
>802-868-6632 Fax
>george.coy@gmail.com
>http://motorstarna.com/
>SKYPE george.coy
>
>
>-----Original Message-----
>From: owner-yak-list-server@matronics.com
>[mailto:owner-yak-list-server@matronics.com] On Behalf Of JL2A
>Sent: Saturday, August 05, 2017 7:42 AM
>To: yak-list@matronics.com
>Subject: Yak-List: Re: Engine mount rubbers - YAK-50
>
>
>We have experienced poor longevity from the rubber mounts even in the CJ6.
>We installed a set that was made from a type of urethane that is still
>soft
>enough yet does not perish when constantly soaked in oil.
>
>Since then we have installed 5-6 sets of the red urethane mounts, the
>first
>set are still fine, something like 1000 hours and 4-5 years later.
>
>I'm just waiting on the spec sheet of the material to send to Doug Sapp. A
>set made here in Australia is about $300 or thereabouts
>
>
>Read this topic online here:
>
>http://forums.matronics.com/viewtopic.php?p=471514#471514
>
>
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