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Engine mount bolts

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Ianrat

Joined: 31 Mar 2008
Posts: 43
Location: Brisbane AUSTRALIA

Posted: Mon May 12, 2008 5:33 am Post subject: Engine mount bolts

Just about to fit the engine mount to the fire wall. What type of bolts are being used (AN or Grade 8 ). 

And are they using Castle nuts or Nylon lock nuts.

Thank you.

Ianrat

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Jaybannist(at)cs.com
Guest

Posted: Mon May 12, 2008 6:32 am Post subject: Engine mount bolts

Ianrat,



I used AN6 bolts with MS21045-6 (AN363-6) nuts.  Those nuts are medium heat self-locking. 



Jay in Dallas

"Ianrat" <ianrat(at)powerup.com.au> wrote:



 	  Quote: 	
		  



Just about to fit the engine mount to the fire wall. What type of bolts are being used (AN or Grade 8 ). 

And are they using Castle nuts or Nylon lock nuts.

Thank you.

Ianrat





Read this topic online here:



http://forums.matronics.com/viewtopic.php?p=182666#182666

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larry(at)macsmachine.com
Guest

Posted: Mon May 12, 2008 7:46 am Post subject: Engine mount bolts

Ianrat,

AN bolts should always be used and not Grade 8.  Castle nuts AN310 or 

Nyloc nuts depend on whether engine

heat is going to be a factor.  Nylocs are only good to 250-degrees F.  

If its an air cooled engine the engine castle nut is recommended.



Larry McFarland 601HDS at www.macsmachine.com



Ianrat wrote:

 	  Quote: 	
		   



 Just about to fit the engine mount to the fire wall. What type of bolts are being used (AN or Grade 8 ). 

 And are they using Castle nuts or Nylon lock nuts.

 Thank you.

 Ianrat

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tonyplane(at)bellsouth.ne
Guest

Posted: Mon May 12, 2008 10:46 am Post subject: Engine mount bolts

Just my $ .02

My Jab FWF came with cad plated steel self-locking  AN ???(not Nylock) type 

nuts. I used these nuts vice the "nylock type" ones supplied by Zenith.  I 

don't have the number in front of me, but you can probably get it from the 

Jab USA website for the Zodiac FWF kit.  In my opinion, I would not 

recommend castle nuts with cotter keys to lock these nuts as  I believe you 

should keep them torqued or risk fatigue/fretting, leading to possible bolt 

failure.. Part of my annual Inspection, and every time my fwd skin is 

removed, is to check the torque.  I use 300 in-lbs.



Tony Graziano

601/Jab3300; 374 hrs; N493TG



---

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n556p(at)yahoo.com
Guest

Posted: Tue May 13, 2008 4:21 am Post subject: Engine mount bolts

"Ianrat" <ianrat(at)powerup.com.au> wrote:

 	  Quote: 	
		  

 Just about to fit the engine mount to the fire wall. What 

 type of  bolts are being used (AN or Grade 8 ).

 And are they using Castle nuts or Nylon lock nuts.


	


Hello, Ianrat, and other listers,

     I must agree in part with what Mac already wrote you.  Use the AN

bolts.  Grade 8 are slightly stronger/harder, but are also a bit more

brittle.  You don't want brittle on something that's potentially so

safety critical as engine mounts.

     I must disagree with something else Mac wrote.  Castle nuts are

good.  Self locking nuts are not necessarily bad.  Nylock type nuts

SHOULD NOT BE USED on an engine mount.  Here's the reasoning:  Under

normal operating conditions, some engines don't produce sufficient heat

to present a problem.  However, forward of the firewall is the most

likely place on an aircraft to have a fire.  If you ever have an

in-flight fire (God forbid), you don't want your engine to fall off the

plane because you used Nylock nuts on the mounts and the nylon melted. 

If you choose to use self-locking nuts on your engine mounts, please

USE ALL-METAL ones.

     Assuming that heat isn't an issue under normal operating

conditions, Nylock nuts are great in almost all other applications.



Phil Raker     N556P     HDS/Stratus     ~85% completed

     (using all-metal self-locking nuts on my engine mounts)

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