PS Magazine - TB 43-PS-601

PS, The Preventative Maintenance Monthly

ISSUE 601

DECEMBER 2002
PS Magazine - TB 43-PS-601 - Page 3 of 33
PS 601
DEC 02
2
M1A1/A2 Tanks…
To the naked
eye, 1/8 inch
doesn’t seem
like much…
…But when it comes
to the nbc sponson
access covers on
m1a1 and m1a2 tanks,
the difference is
huge.
Put the
right bolt
in the
right
hole
and you’re good to go.
Mix up the 11/4-in bolts with the
11/8-in bolts, though, and you
could end up with a hole punched
in the nbc condenser. That puts
the nbc system out of order and
makes your tank NMC.
The 2-in bolts aren’t a problem
because they are 1/2 inch wide
and won’t fit in the 5/8-in
diameter holes.
All of the outboard holes and the two inboard holes on the large plate
take
2-in bolts,
washer,
Torque these bolts to 75-80 lb-ft.
When removing the access covers, you can save
yourself a big headache by marking each bolt and the
hole it goes into with a dab of colored paint.
Use a different color for each size bolt.
You can also
try
tagging
the
hardware as you
take it off. nsn
gets
50 reusable
wire tags.
Extra Note
When lifting the
access covers, go
easy. Forcing the
covers will break
the locator clamp
screws. Then, the
entire turret has
to be removed in
order to replace
the screws.
The bolts
that hold
the access
covers in
place come
in
three
sizes…
Here’s
how to
avoid any
mix-ups…
1
1
⁄
8
inches, NSN 5305-00-432-3755
1
1
⁄
4
inches, NSN 5305-00-724-7219
2 inches, NSN 5305-00-071-2071
The 11/8-in bolts go in the four inboard holes
on the two smaller plates. Make sure you
include a
flat washer
to help hold the bolt in
place and torque the
bolt to 100-105 lb-ft.
The 11/4-in bolts go in
the retaining plates
that join each of the
covers together.
Do
not
add a washer to
these bolts. Torque
‘em to 100-105 lb-ft.
inboard side
hey, shorty,
I’ve got a
full 1/8 inch
on you!
yeah, but I
won’t punch a
hole in the nbc
condenser,
either!
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