PS Magazine - TB 43-PS-687
PS, The Preventative Maintenance Monthly
ISSUE 687
FEBRUARY 2010
12
PS 687
FEB 10
13
PS 687
FEB 10
Y
ou probably know by now that the manual release switch on your up-armored
HMMWV’s automatic fre extinguishing system (AFES) has a sa±ety wire. But you
might not know there are no procedures to replace the switch guard sa±ety wire or to
inspect it ±or accountability. And the sa±ety wire isn’t shown in TM 9-2320-387-10
or TM 9-2320-387-24P!
TACOM LCMC wants to fx that by making the sa±ety wire a PMCS item. Then
you’ll know what to do i± the sa±ety wire is broken or removed.
TM 9-2320-387-10 and TM 9-2320-2320-387-24P will be updated to include
sa±ety wire PMCS in±ormation. But until that happens, sa±ety-wire the manual release
switch guard in the down or guarded position on the AFES, i± it isn’t already. Just get
the anti-pil±erage seal (sa±ety wire kit), NSN 5340-00-835-9815, which includes the
wire and seal, and ±ollow these instructions:
1.
Ensure the switch guard is in the down or guarded position.
2.
Insert the sa±ety wire through the
hole in the switch guard and into the
lower tab below the switch.
3.
Insert both ends o± the wire into
the sa±ety seal. Pull the wire tightly to
ensure the switch guard is secured in
the down or guarded position.
4.
Use a crimping tool to compress
the seal.
5.
Cut any excess wire ±rom the seal.
In case you were wondering, broken or missing sa±ety wire does not deadline your
HMMWV.
Y
ou old-timers may remember that the original HMMWV’s 6.2L engine came out back in
1984. But you may not know that it’s history now—at least in part!
In 2000, the 6.5L detuned engine, NSN 2815-01-439-6664, was introduced as a follow-up
and drop-in replacement for the 6.2L engine. And now the 6.5L detuned engine, calibrated
to closely match the power output of the 6.2L engine, is the only engine you can get for
your HMMWV.
The newer engine was designed for improved performance. And it helped correct the
problem of rear main seal leakage. This is because the two-piece seal was replaced with a
one-piece seal.
TACOM LCMC will no longer repair or issue 6.2L engines!
This decision is part of
modernizing the HMMWV fleet and addressing the diminishing spare parts for the 6.2L
engine. Discontinuing 6.2L engines reduces the logistics burden and footprint for stocking
the engine and its parts. It also supports the efforts of the RECAP and RESET repair
programs, and ensures that no 6.2L engines are put back into HMMWVs.
Although the 6.2L engine is obsolete, you should keep using it as long as it works.
Just be sure to send it to DRMO when it’s deemed unserviceable. And make sure all
fluids are removed from the unserviceable
6.2L engine
before
sending it to DRMO,
like the TM says.
Note that some repair sites are receiving
6.2L engines turned in to the 6.5L engine
repair programs, but they shouldn’t. Avoid
extra transportation costs and wasted
time by making sure you send the right
engine to the right place. The 6.5L engine
block has a turbo mounting bracket, but
the 6.2L engine block does not.
AFES Safety Wire Maintenance
Up-Armored HMMWVs…
6.5L Engine Replaces 6.2L
HMMWV…
1984
2010
6.5L engine has turbo
mounting bracket
sir, we’re
guarding the
afes switch!
Run safety wire through here
the switch guard
safety wire does that!
get back to work!!
time to
get a 6.5
liter!
it sure
is!
it
sure
is!
is this a
6.2 liter
engine?
yeah!
is this a
6.2 liter
engine?
AFES Safety Wire Maintenance
687.12-13.indd
1-2
12/28/09
10:05:31 AM
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