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hotwheels
Joined: 01 Jun 2007
Posts: 240
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 Posted: Wed May 05, 2010 11:09 am Post subject: firewall shields... yet again |
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I've been reading a lot about firewall shields lately.
For split shields like 61-300 from Aircraft Spruce... If using over existing wires, is it designed to cover the existing grommet? Or maybe it's assumed that there isn't an existing grommet? I can't see how any new grommet would be applied for existing wires unless that grommet were split too. Maybe I'm just missing something obvious.
These look pretty interesting for new wire runs... http://precision-grommets.com. Lots of sizes and available in stainless too.
Regards,
Jay
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nuckolls.bob(at)aeroelect
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| Posted: Wed May 05, 2010 5:49 pm Post subject: firewall shields... yet again |
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At 02:09 PM 5/5/2010, you wrote:
--> AeroElectric-List message posted by: "jayb" <jaybrinkmeyer(at)yahoo.com>
I've been reading a lot about firewall shields lately.
For split shields like 61-300 from Aircraft Spruce... If using over existing wires, is it designed to cover the existing grommet?
The shields are to protect a grommet which is part of
the complete installation.
Or maybe it's assumed that there isn't an existing grommet?
There must be one. Also, it's also a good idea to
use some fire-putty to put a nice fillet around the
wires and cover the gap between the shield an
grommet underneath.
I can't see how any new grommet would be applied for existing wires unless that grommet were split too.
Yup, that's what you have to do. It's commonly done
to replace aged and degraded grommets with new ones
without pulling the wires out of the hole.
Maybe I'm just missing something obvious.
These look pretty interesting for new wire
runs... http://precision-grommets.com.
Lots of sizes and available in stainless too.
[img]cid:.0[/img]
Certainly a class act product. Keep in mind that
the PRIMARY purpose of a grommet is to mechanically
separate and isolate relatively vulnerable wire
insulation from the sharp edge of a fire-wall
sheet or other thin penetration. Maintaining
fire-wall integrity calls for gas-tightness with
some degree of resistance to fuel fed flames.
Of course, the classic rubber/plastic grommet has
no resistance to flames so we have to add the
steel shields and fire-putty to add flame resistance
to the assembly.
Grommets like those shown above are obviously
flame resistant but we're still interested in
the best-we-know-how-to-do for gas tightness
too. So perhaps the fire-putty fillet on the
engine side is still called for.
Bob . . .
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