PS Magazine - TB 43-PS-697

PS, The Preventative Maintenance Monthly

ISSUE 697

DECEMBER 2010
PS Magazine - TB 43-PS-697 - Page 10 of 33
16
PS 697
DEC 10
Check the radiator. Look for leaks on the top, front, back and bottom.
Leaks may not show up when your engine is cold, so look for rust and odd-colored
dribbles where coolant has leaked and dried.
Later, when you’ve got the engine running at operating temperature and pressure,
check those places again for wet spots. Use a Fashlight during both inspections.
Finally, take the radiator cap off carefully. If the cooling system is hot, open the
±ller cap slowly until all pressure is gone. But be sure to use a rag or glove to protect
your bare hand from a hot cap or hot coolant.
The coolant should be a little over the top of the
core. It should be almost clear—and colored by the
antifreeze.
If your coolant is muddy-looking or has bits of gunk
in it, your cooling system needs draining and Fushing,
and maybe even cleaning. Report it.
If you see a rainbow of oil slime on top of the
coolant, you probably have a leak inside the engine.
Exhaust gas or oil is getting into your cooling system.
Pull the crankcase dipstick and check for water in the
oil. Little blobs of water will show on the dipstick.
Report any slime or blobs that you see.
Drivers, air-cooled systems don’t need much attention. All they need is a good
flow of air. That means all the airflow shrouds must be in place.
Additional Authorization List (AAL)
For M105A2 and M149A2 trailers:
Get your commander’s approval
to replace the original lunette with
a swivel lunette that comes with
The swivel lunette on these
trailers makes lining up the trailer
with the truck’s towing pintle a
whole lot easier—especially in
rough terrain or bad weather. Just
mount the new lunette into the old
lunette’s recess.
M105A2/A3, M149A2 and M200A1 Trailers…
AAL and Replacement
Landing Leg
Report
water
blobs on
dipstick
Bolt
leak
Seam
leak
Seam
leak
Seam leak
Bugs, leaves,
other debris
Hose cracked,
brittle, mushy
Wrong or broken
pressure cap
Oil or fuel
in coolant
Hose connection
leak
Hose clamp
loose, broken,
missing
Coolant in
engine oil—
shows on
dipstick as
blobs of water
Hose
connection
leak
Hose connection leak
Drain cock leak
Belt cracked,
ragged, loose,
missing
Core leak
Plug
leaks
Head gasket leak
Check for leaks or other cooling system problems
NSN 2540-01-557-0056 gets swivel lunette
need the latest
changes related
to your m105a2,
m105a3, m149a2,
and m200a1
trailers?
we think it’s
time you have
your landing
leg replaced!
I’m glad
somebody
is paying
attention!
keep reading
to get an aal
update and the
latest info on
landing legs.
697.16-17.indd
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11/1/10
5:41 PM
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