PS Magazine - TB 43-PS-603
PS, The Preventative Maintenance Monthly
ISSUE 603
FEBRUARY 2003
PS 603
FEB 03
53
M9 ACE…
S
moke coming from the barbecue grill means its time to flip that burger.
Any smoke coming from the ACE’s engine compartment means it’s time to shut
down the vehicle – EL PRONTO!
Here are two hot spots you need to keep in mind to help prevent an engine fire or
the vehicle shutting down.
Wiring Harness
Take a look at the wiring harness for the engine’s fuel shutoff valve. It’s right next
to the exhaust manifold (roadside).
If the harness is too close to the manifold, the wiring will melt and burn. A melted
harness means the vehicle shuts down and stops running.
Push the wiring harness down with your hand and look for any melt marks on the
wiring. If you see any marks, report it to your mechanic.
Make sure any clamps on the nearby wire or hydraulic hoses are in place and
attached. Use a tie-strap, NSN 5975-00-074-2072, to pull the wiring harness away
from the exhaust manifold.
Retainer Bracket
While the access door to the engine compartment is open, eyeball the same road-
side wall where five hydraulic lines are mounted—directly across from the engine’s
exhaust manifold.
These hydraulic lines go to a hydraulic shift control valve that operates the vehicle.
Each line is held in place by a retainer bracket that keeps it snug against the wall.
Sometimes the bracket gets mis-
placed when a hydraulic line is
repaired, or when the engine is
repaired by support. It makes no
difference—do not run or operate
the earthmover when the bracket is
missing. Those hydraulic lines will
rub up against the engine’s exhaust
manifold. That manifold gets hot
enough to start a fire!
Have your mechanic replace a
missing bracket with NSN 5340-
01-179-7530. It’s shown as Item
40, Fig 140 of TM 5-2350-262-24P.
As always, remember to file an
accident report on DA Form 285 on
all fires. Problems can’t be fixed if
they’re not reported.
Look for lines rubbing
on exhaust manifold
Strap keeps hydraulic
lines in place
The story you
are about to
read is true.
The names have
been changed
to protect the
innocent …
Argh!
I don’t
believe
this!
What
happened
here, ma’am?
there was
an engine
fire!
Could you
describe the
fire, ma’am? For
the record.
I can’t
believe this
is happ-
Just
the
facts,
ma’am.
The engine
stopped running.
There was heat,
smoke, flames
up to here!
Gannon?
Look under
the hood.
Tell me what
you see.
No retaining
bracket,
sergeant
Friday.
I thought
so! Let’s go
find the
mechanic
responsible,
Gannon.
Make sure clamps
are in place
Any melt marks on
wiring harness?
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