PS Magazine - TB 43-PS-554
PS, The Preventative Maintenance Monthly
ISSUE 554
JANUARY 1999
PS 554
55
JAN 99
PS 554
54
JAN 99
if it is missing by looking for a length
of copper tubing between the pressure
gauge and the mixing chamber.
If the tubing’s not there, there is no
safety valve. Get one and install it as
spelled out in Para 4-9.10 of TM 10-
7360-204-13&P.
If you see the copper tubing, you
still need to check out the safety de-
vice. First, check for damaged tubing.
If tubing is damaged, replace it. Then
test its operation, like so:
1.
Drain the fuel tank.
2.
Use an air compressor to pressur-
ize the tank to 55-65 psi, where
the safety valve should open.
3.
If the safety valve is OK, it will
open. Then the pressure will
drop rapidly to 35-45 psi, where
the safety valve should close.
If it doesn’t open or close like
it should at these pressures,
replace it.
4.
Check the safety device for leaks
with a solution of soapy water.
Tighten any loose hardware.
5.
Set the burner on its end and
slowly turn the filler cap
counterclockwise to release
the air pressure.
Never release the air pressure
near any heat source. Gas vapors will
ignite. Always allow the burner to cool
before releasing pressure. Use proper
refill and lighting procedures as spelled
out in TM 10-7360-204-13&P.
If your burner needs an air valve
and gasket, you can get a kit, NSN
7310-01-456-0776, to update it. The
kit contains an air valve assembly, gas-
ket, and installation instructions.
4.
Eyeball the cap. If soapy bubbles
are escaping, replace the gasket.
Use NSN 5330-01-
362-3428.
If the filler cap
gasket is a round
rubber O-ring,
replace it with
NSN 5330-01-
362-3428.
Safety Valve Device
If your burner does not have the
safety valve device assembly, NSN
7360-01-343-9014, don’t use the
burner until one can be installed. You
can tell
M2 Burner . . .
Filler Cap Gasket
If your burner has filler cap gasket,
NSN 5330-01-278-4024 (it’s a flat,
round washer-type gasket made of a
cork/rubber composite), it may leak.
Test it like this:
1.
Stand the cooled-down burner on
its end.
2.
Tighten the filler cap.
3.
Pressurize the tank with air to 25
psi, and put soapy water around
the filler neck.
The two-part valve is silver on the fill
end and brass on the base.
Look for tubing
Replace one-piece air valve assembly.
..
...with two-piece valve
Tighten cap, check for leaks
Replace
round
O-ring
ome of your kitchen’s M2 and
M2A burners may have defective or
missing parts.
Since you don’t want to start your
day with a fire or an explosion that
can get you killed, here’s how you and
your repairman can make those burn-
ers safe to use.
Air Valve Assembly
If your burner has air valve assem-
bly, NSN 7310-00-999-2508 (a one-
part valve that’s silver in color), re-
place it immediately with the two-
part valve, NSN 7310-01-449-9955.
what you
don't know
about
your
m2
and
m2a
burners
can
kill you
!
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