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Engine mount bolts

 
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Ianrat



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

PostPosted: Mon May 12, 2008 5:33 am    Post subject: Engine mount bolts Reply with 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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Jaybannist(at)cs.com
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PostPosted: Mon May 12, 2008 6:32 am    Post subject: Engine mount bolts Reply with quote

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


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



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larry(at)macsmachine.com
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PostPosted: Mon May 12, 2008 7:46 am    Post subject: Engine mount bolts Reply with quote

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
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PostPosted: Mon May 12, 2008 10:46 am    Post subject: Engine mount bolts Reply with quote

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
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PostPosted: Tue May 13, 2008 4:21 am    Post subject: Engine mount bolts Reply with quote

"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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