PS Magazine - TB 43-PS-554
PS, The Preventative Maintenance Monthly
ISSUE 554
JANUARY 1999
PS 554
9
JAN 99
PS 554
8
JAN 99
Rattles? It±s OK
Rear-mount antenna rubs canvas
If the CDRV flunks, replace it
with NSN 2990-01-147-9284 for
the HMMWV± There is no test for
the CUCV²s CDRV± If you suspect
it²s bad, replace it, NSN 2990-01-
147-9284±
Check the CDRV connectors and
hoses, too± If they are loose or the
hoses have holes, dirt will plug the
CDRV± Tighten or replace them if
necessary±
Dear Editor,
The units we support have a
problem with antennas rubbing
holes in the HMMWV±s cargo
cover²
For units that don±t have the
offset mount, there±s a simple
fix to take the rub out²
Cut out an 8x2-in patch from
an old piece of canvas² Patch over
the worn spot² Use a rubber-
based adhesive to hold the patch
in place² NSN 8040-00-298-
1946 gets an 8-oz can²
HMMWV ± ± ±
Offset Antenna Rub
hen the pressure gets too much
for your HMMWV or CUCV, some-
thing²s got to give±
A clogged crankcase depression
regulator
valve
(CDRV)
on
a
HMMWV or CUCV, or a plugged-up
oil filler cap on your CUCV, lets pres-
sure build in the crankcase± What gives
are oil pan and valve cover gaskets
and crankcase seals, which can lead to
a blown engine±
Oil Filler Cap
The CUCV oil filler cap is easy to
test± Take it off and shake it± If it rattles,
s
e
a
l
o
f
it²s OK± If it doesn²t, replace it± Do
this every semiannual service±
CDRV
Item 7 in Table 2-1 of the
HMMWV²s TM 9-2320-280-20-1 says
to check the CDRV every six months±
Item 2 in Table 2-1 of the CUCV²s
TM 9-2320-289-20 says to check its
CDRV annually±
But don²t wait if you see oil on the
engine or on the ground after the truck²s
been running or if you see blue ex-
haust smoke± Those signs tell you the
CDRV²s probably clogged±
Repairmen, use a manometer to test
the HMMWV²s CDRV for two to five
inches of vacuum at 2,000 rpm± The
procedure²s on Page 3-14 in TM 9-
2320-280-20-2±
Check hoses and connectors
for looseness and holes
SGT Gene Armstrong
ECS#6, MTARNG
Helena, MT
my cdrv is
clogged
. i can't
take the
pressure!
look
ouT!
THE
ENGINE'S
GONNA
BLOW
!
HMMWV, CUCV ± ± ±
PS 554
9J
A
N
9
9
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