n556p(at)yahoo.com
Guest
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 Posted: Tue May 13, 2008 4:21 am Post subject: Engine mount bolts |
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"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.
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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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