PS Magazine - TB 43-PS-572
PS, The Preventative Maintenance Monthly
ISSUE 572
JULY 2000
PS 572
13
JUL 00
PS 572
12
JUL 00
M1-Series Tanks . . .
Installation
Here’s what to do with the new seal
and clamps:
1.
Pull back the lip of the seal and
install the inner clamp. Then put the
outer clamp on the seal with the clamp
screw positioned at the top.
the hull access plate. With a flashlight
in hand, it’s easy to tell if the bottom
of the seal is ready to go.
3.
Pull back the lip and slide the inner
clamp around so that the clamp screw
is at 5 o’clock.
4.
Torque both the inner and outer
clamp nuts to 60–85 lb-in.
Last Step
After you’ve installed the plenum
seal, don’t try to reach around it to feel
if the seal’s in place. You won’t be
able to reach far enough and it’s al-
most impossible to tell if the seal is
pinched, anyway.
Instead, crawl under the tank and
check the bottom of the seal through
edge of the seal lines up with the yel-
low line all the way around the rim.
Inner clamp fits under seal lip
Wipe
rim
with
damp
cloth
Line up plenum seal with yellow line
echanics, letting an M1-series tank
operate with a loose or torn air induc-
tion system plenum seal is like signing
its death warrant.
The turbine has to get air from some-
where, whether it’s clean or dirty. And
if the plenum seal is damaged or not
installed correctly, you can bet a lot of
the air’s going to be dirty.
So make sure the engine gets clean
air. Here’s how:
Inspection
Remove the air intake cover and look
at the seal for tears or other damage.
Feel under the seal’s lip, too. The sur-
face should be flexible and springy,
not soft or brittle.
2.
Wipe off the air intake rim, then
slide on the seal, top side up. Wipe the
plenum seal, too. Make sure the outer
Next, examine the inner and outer
hose band clamps. Look for looseness
or stripped threads.
Any damage to the seal or clamps
means you replace ’em. A new seal
and outer clamp comes with NSN
5330-01-079-9954. NSN 4730-01-083-
6059 gets a new inner clamp.
Check underside for seal pinches or gaps
what's
going on?
with a
torn
plenum
seal, my engine
is as
good
as
gone
!
Leave seal and clamps in place
while checking for damage
PS 572
13
JUL 00
PS 572
12
JUL 00
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