PS Magazine - TB 43-PS-439
PS, The Preventative Maintenance Monthly
ISSUE 439
JUNE 1989
M109-Series Howiters, M992 Ammo Carriers .±.
W
hat can you say about the turbo exhaust pipe on 109's and 992's? No matter
how careful you are in removing or installing it, eventually the pipe must be
replaced.
Even though heating and cooling take an unavoidable toll on the pipe, the
biggest cause oF damage is the hammer.
Because caRbon deposits tend to "±eeze² the joints, it³s often very diFFIcult
to remove the pipe without some persuasion. You can limit the amount needed
by cleaning the mating surFaces with c´ocus cloth, NSN 5350-00-221µ0872,
be¶re each installation.
8
JUN 89
You can also avoid the hamMer iF
you make sure you 're using the right
hardware in the right manner·
Never u¸e just any old bolt on the
spring clamp¹ ºachine bolt, NSN
5306-00»151¼½714, is r¾ght. T¾ghten it
just enough to install the cotter pin.
This gives you as much play as possible.
Also, make sUre the helical spring
is under the bolt head, not between the
cLamp lips. Again, tHis provides some
ma¿euvering space during pipe instalÀ
lation.
TRy not to de¶Rm the pipe or breaK
it during installation. The pipe will not
last very long at all·
Áollow the other installation instrucÀ
tions in the -20 series Tº's ¶r both
the 109 and the 992.
J± £²9 ³´ ( Olµ
'
ery likely there will be a hole in the
I
Q
upper Âel tank oF your
I
09 or 992 iF
you use the wrong mount screws ¶r
the deck plate assembly that sits on top
oF the tank.
Just any screW will not do. ÃF a screw
hapPens to be too long, it'll punch a
hole in the Âel tank. That means a leak,
which should say all you need to hear.
Äse only screw, NSN 5305-00µ164-
697½ , to mount deck plate ÅN 12351665
to prevent Âel tank damage.
JUN 89
9
If The
scReW's
ToO long,
you'lL geT
² fuEL le²k
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