 |
Matronics Email Lists
Web Forum Interface to the Matronics Email Lists
|
| View previous topic :: View next topic |
| Author |
Message |
recapen(at)earthlink.net
Guest
|
 Posted: Mon Sep 17, 2012 7:44 am Post subject: Engine mount bolt sizing |
 |
|
I have my engine and prop back from inspection after getting hit by the hangar door (tornado, derecho, straight-line winds).
With only 168 hours on it - I'm going to re-use the rubber Lord mounts - but I am replacing the bolts, castle-nuts, and cotter pins...that brings me to my question:
When I originally installed the engine, I used the sizes specified by the plans (AN7-43 for the uppers and AN7-44 for the lowers). In order to get the hole in the AN-310 castle nut to line up, each set took an extra (meaning a total of two) AN960-7 washers 'under' each castle-nut. It was not possible to get a standard wrench around the top-left castle-nut to tighten it. Since each set required an extra 960-7 washer to get it to line up, can I use one size shorter bolt for the re-do and eliminate the extra washers all around - also allowing me to get a regular wrench on the top-left nut???
Ralph
RV6A N822AR (at) N06
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
|
|
|
| Back to top |
|
 |
napolin(at)me.com
Guest
|
| Posted: Mon Sep 17, 2012 1:44 pm Post subject: Engine mount bolt sizing |
|
|
Hi Ralph
The proper length bolt will prevent any threads from bearing inside the hole which will damage the mount. If after you intall a shorter bolt all of the threads are out of the hole you should be fine.
However, in the case you are describing I suspect if you use shorter bolts you will end up with threads in bearing which is a nono.
Nikolaos Napoli
On Sep 17, 2012, at 11:44 AM, "Ralph E. Capen" <recapen(at)earthlink.net> wrote:
| Quote: |
I have my engine and prop back from inspection after getting hit by the hangar door (tornado, derecho, straight-line winds).
With only 168 hours on it - I'm going to re-use the rubber Lord mounts - but I am replacing the bolts, castle-nuts, and cotter pins...that brings me to my question:
When I originally installed the engine, I used the sizes specified by the plans (AN7-43 for the uppers and AN7-44 for the lowers). In order to get the hole in the AN-310 castle nut to line up, each set took an extra (meaning a total of two) AN960-7 washers 'under' each castle-nut. It was not possible to get a standard wrench around the top-left castle-nut to tighten it. Since each set required an extra 960-7 washer to get it to line up, can I use one size shorter bolt for the re-do and eliminate the extra washers all around - also allowing me to get a regular wrench on the top-left nut???
Ralph
RV6A N822AR (at) N06
|
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
|
|
|
| Back to top |
|
|
recapen(at)earthlink.net
Guest
|
| Posted: Tue Sep 18, 2012 3:31 am Post subject: Engine mount bolt sizing |
|
|
Nikolaos,
Thanks for your insight - I will check that before I finish. Vans official answer was that it was OK based on the bolt length - but this is important also...
Ralph
--
| | - The Matronics RV-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?RV-List |
|
|
|
| Back to top |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
Get Email Distribution Too!
FAQ
Search
Memberlist
Usergroups
Register
Profile
Log in to check your private messages
Log in
