PS Magazine - TB 43-PS-559

PS, The Preventative Maintenance Monthly

ISSUE 559

JUNE 1999
PS Magazine - TB 43-PS-559 - Page 5 of 34
7
JUN 99
PS 559
6
JUN 99
Radiator Grille Mounting
W
atch how you install the radiator grille on HMMWVs, mechanics. They can
be installed upside down.
Installed correctly, with the grille crossmembers slanted toward the front of
the truck, the grille forces air into and over the radiator and oil coolers.
Installed incorrectly, with the grille
crossmembers slanted toward the rear
of the truck, the grille just passes air
on over the truck. That overheats the
engine, transmission and power steer-
ing oil.
It’s a simple thing, but very impor-
tant. Take a quick look at your
HMMWVs and change any that are
installed incorrectly.
here’s a solution at hand so you
won’t have to drop the HMMWV’s fuel
tank to work on its sending unit or to
replace a leaking access cover gasket.
A cargo floor access hole and cover
kit, NSN 2510-01-454-7077, has the
instructions, hardware and plate to in-
stall an access cover in the truck’s cargo
floor.
Get the kit and the next time you
have to drop the tank, install the cover
while the tank’s off. Then, you’re set.
With the access cover installed, you
can remove and replace the sending
unit or gasket
with the fuel tank in
place.
The instructions show how unit
mechanics can cut the cargo floor and
install the cover plate.
But, this kit cannot be used on
HMMWV ambulances (M996/M997)
or Avengers because of their design.
f you have one of those glow plug removal tools that we provided the plans for
in PS 524 (Jul 96), or if you plan to make one, listen up:
You may have to shorten the tool handle by 1
1
/
2
to 2 inches in order
to remove the #6 and #8 plugs on the passenger side of the engine.
The handle is too
long to use at those
locations. It keeps you
from applying upward
pressure on the plugs
as you remove them.
To make the tool, use
1
/
8
-in flat steel, NSN
3
/
8
-in round rod, NSN
Make sure the open
end of the fork is no
more than
11
/
32
inch
wide. The forked end
fits behind the hex
head of the plug. You
can grind down the fork
end if that makes it
easier to use.
Place the fork behind
the plug head with the
angled portion against
the fuel injector nozzle
for leverage. Slowly
unscrew the plug while
applying steady outward
pressure with the tool.
If you turn too fast or
use too much pressure,
you’ll break the plug. Then
your truck goes to support.
HMMWV . . .
11
/
32
"
5
1
/
2
"
2"
3
/
4
"
1
/
2
"
3
/
8
" rod
Grille crossmembers should slant forward
hey!
what about
me?!
sometimes
shorter
is
better
!
an
access
cover
would've
made this
easier
.
Remove access cover
(shorten as needed)
1
/
8
"flat
steel
135
°
Fuel tank underneath
Cargo floor
7
JUN 99
PS 559
6
JUN 99
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