PS Magazine - TB 43-PS-732
PS, The Preventative Maintenance Monthly
ISSUE 732
NOVEMBER 2013
Dear Sergeant N.O.,
“NO STEP” signs are a great idea! That’s because the fns on your HMMWV’s
radiator and oil cooler protect your HMMWV’s engine and transmission From
overheating.
Without protection, the fns can bend during PMCS and repair work. And when
enough oF the fns are bent, the reduced air ±ow through the radiator and cooler
leads to engine and transmission overheating.
So another good idea is to make a fn shield to keep the fns on your HMMWV’s
radiator straight!
Making the Fin Shield
10
PS 732
NOV 13
Dear Half-Mast,
Soldiers are stepping on the radiator fins in their HMMWVs and bending
them. I think they should put “NO STEP” signs on HMMWVs, like those found
on helicopters. How about you?
SSG N.O.
Using the Fin Shield
Once you’ve made a fn shield, you can
use it right away. Just remove both plate
covers and seals From the airliFt backets.
and slip it over the two liFting rings. Then
lay it ±at on the oil cooler Frame. The
rings prevent the shield From sliding onto
the raised hood.
Don’t
run the engine with the shield
in place! It’ll block air ±ow and lead to
engine overheating—the very thing your
shield is designed to help prevent!
AFter using your fn shield, replace the eye-hook seals. And even though the
board should protect the fns against bending, check For bent fns anyway. Then use
the fn-straightening tool, NSN 5120-00-157-2180, iF needed.
Storing the Fin Shield
Take care oF the fn shield by storing it ±at. That keeps it From warping. Lay it on
the ±oor away From traFfc areas, or hang it on the wall against a ±at surFace.
NO STEP
3’
10
1
/
2
”
3”
4
1
/
2
"
1
1
/
2
"
6"
3’
4”
2’
10”
2’
7
3
/
4
”
Adjust the dimensions to ft your HMMWV.
Then, round oFF the edges and paint the
board to prevent splinters.
And be sure to
stencil NO STEP on the board.
You’ll also see this inFo on Page D-52 oF
TM 9-2320-280-20-3 and Page D-26 oF TM
9-2320-387-24-2.
HMMWV…
“NO STEP”
Shield
Prevents
Overheating
Fabricate a fin shield by
cutting
3
/
4
-in plywood
using these approximate
dimensions:
Store shield flat on floor…
Lay shield flat on oil cooler frame
…or on wall
leMme guess,
bent radiator
fins
are the
culprit.
yeah, this is
what we get for
not
using our
“no
step” shield
during
engine work!
732 10-11.indd
1-2
9/23/13
3:01 PM
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