PS Magazine - TB 43-PS-621
PS, The Preventative Maintenance Monthly
ISSUE 621
AUGUST 2004
PS 621
AUG 04
3
Stryker…
B
oresighting the MK19 or .50-cal machine gun on your Stryker is easy with the sight
alignment tool kit, NSN 1240-01-512-4531. That is unless you’re too heavy-handed.
Some operators have a tendency to jam the boresight telescope, NSN 1240-01-490-
5099, too tightly into the MK19 or .50-cal adapter. Since it’s hard to get out, they end
up twisting the telescope loose.
Enough of that wears a small groove around the shaft. The telescope starts wobbling
when it’s inserted into an adapter and boresighting becomes a lot tougher.
Your best bet is to avoid jamming the telescope and adapter together. If you do have
problems getting them apart, use the drift key that comes with the tool kit. Just slip the
drift key in the slot on the adapter and push it forward to pop the telescope free.
PS 621
AUG 04
2
Stryker…
time to
boresight
your mk19!
my sight alignment
tool kit could do
with a
little less
jam
this time!
hey!
you’re
not
the only
one who could
use a little
coolant!
Here’s
how…
Open the front service and
engine cover hatches and eyeball
the sight glass on the surge tank.
The sight glass should be com-
pletely full. If it’s not, carefully
remove the pressure cap on top of
the surge tank and add coolant
until the sight glass is full.
Make sure you let the engine cool before removing the cap during an after-opera-
tions check. Otherwise, hot coolant can spray from the opening, causing severe
burns. It’s also a good idea to wear protective gloves and chemical goggles to protect
your eyes and skin.
Next, check the coolant over-
flow reservoir. If the coolant isn’t
above the FULL COLD mark,
remove the cap and add coolant.
The right amount of coolant in
the surge tank and overflow reser-
voir will help your Stryker keep its
cool when the heat is on.
Sight glass
completely
full of
coolant?
Coolant
should be
above
FULL COLD
mark
Adapter and telescope
jammed too tight?
Insert drift key…
…and push forward
to pop telescope loose
keep your cool!
to stay
cool
in the heat of
summer—and the
extreme heat
of the desert—
your Stryker’s
coolant levels
need to be
checked after
operations,
drivers.
Groove wears here
621. 02-03 (C)
7/3/04
12:34 PM
Page 1
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