PS Magazine - TB 43-PS-715
PS, The Preventative Maintenance Monthly
ISSUE 715
JUNE 2012
8
PS 715
JUN 12
9
PS 715
JUN 12
C
rewmen, that gassy hiss you keep hearing might not be from last night’s tacos. It could
be an exhaust leak from the engine compartment of your howitzer or ammo carrier.
If so, the culprit could be a worn-out exhaust deflector packing. It’s supposed to plug
up the space between the deflector and the end of the engine exhaust pipe.
Once the packing is worn enough,
you’ll get exhaust leaks in the engine
compartment.
That’s
a
potentially
dangerous problem.
Replace that packing when you start
seeing leaks. A new packing comes
with NSN 5330-01-382-4272. Use the
whole packing to fill the gap between
the deflector and the hull mount.
If the seal support is bent so the deflector won’t seat right, replace it. NSN 2990-00-894-
0075 gets a new support.
Make sure the cap screws that hold the
deflector snug against the packing are not
stripped or cross-threaded. Replace bad screws
with NSN 5305-00-269-3238. Note that you’ll get
100 screws with that NSN.
And the next time you need to pull the
powerpack, make sure you remove the exhaust
deflector first. Otherwise, the deflector gets
ripped off when you remove the deck.
‘Course, it probably wouldn’t hurt to lay off the spicy food, just in case.
Dear Editor,
During several recent site visits, we’ve found that units have been using
jack stands in the wrong place when performing maintenance on their
M119A2 howitzers.
When the jack stand is
placed under the forward
portion of the trail assembly
(the T-bar), the weight of
the howitzer could cause
some significant damage to
the T-bar. This area has a
machined, precision surface
that plays a vital role in
plane setting, boresighting
and the fire control
alignment test (FCAT).
This area of the howitzer
is also used for the gunner’s
quadrant, so it’s very
important that it remain in
good condition.
Could you let everyone
know that the proper
location for the jack stand
is under the suspension
stop bracket? It’s called
out in WP 0032 004 of
TM 9-1015-252-20&P
(Aug 06, w/Ch 1, Feb 08).
Michael Quig
Randall Trebat
TACOM LARs
Ft Bragg, NC
Editor’s note:
Consider them told, gentlemen!
M109-Series SP Howitzer, M992A2 Ammo Carrier…
Exhaust Pipe Needs a Good PaCking
M119A2 Towed Howitzer…
The
Right
Spot Makes a
DifFF
erence!
Packing
missing or
damaged?
Proper location is
under suspension
stop bracket
Don’t
place
jack stand
under T-bar!
Replace damaged or missing screws
c’mon,
man!
it’s not
me!
what
did
you eat
last
night?
sorry,
guys!
guess
my engine
exhaust
packing is
leaking!
using jack stands in the
wrong
location is a sure way to cause
damage
to your m119a2!
715 08-09.indd
1-2
5/1/12
4:50 PM
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