PS Magazine - TB 43-PS-582
PS, The Preventative Maintenance Monthly
ISSUE 582
MAY 2001
But between these cleanings you can
keep the oil coolers clear like this:
1.
Open the access hatches on the
rear deck of the tank. Older model
M1s don't have the hatches. You'll
need to remove the rear deck to
gain access.
2.
Remove the two access covers
on the top of the engine ductwork.
3.
Pour large amounts of water
through the openings in the duct-
work while the engine is running. The
fans force the water against the backs of the coolers and wash away dirt and oil. Hot water
works best, but even cold water will remove most of the deposits.
4.
Replace the access covers and hatches.
PS 581
APR 01
17
echanics, the tape on the edges of a tank's fuel cell heat shields takes a lot of
rough treatment. Fuel, oil and water lead to dry rot. Bumps and rubs during power-
pack installation wear out the tape before its time.
The PMCS tables in the -20-1-1 TMs say the vehicle is NMC if the heat shields are
damaged, so most units simply replace them.
If the tape is all that's damaged, save
your unit those repair bucks by replacing
it instead of the heat shield. As long as the
damaged edge of the tape is 12 inches
long or less, just pull off the old tape and
replace it with NSN 7510-01-176-3398.
Heat shields with more extensive damage
should be replaced to avoid a fire hazard.
PS 581
APR 01
16
M1-Series Tanks…
D
rivers, an ENGINE OIL TEMP HIGH or TRANSMISSION OIL TEMP
HIGH light is a good sign of clogged oil coolers on your tank.
The fans that drive cooling air
through the engine and transmission oil
coolers use air that is drawn from out-
side the tank as it moves. If the outside
air is dusty or wet, a deposit builds up
on the coolers. Leaking oil or fuel also
ends up on the coolers.
The thicker the build-up, the more
oil temperatures rise. Eventually, the
coolers clog and the warning lights
come on. Then you've got to trou-
bleshoot to find the problem or risk
burning up the engine.
Your mechanic cleans the oil coolers
thoroughly using steam or solvent dur-
ing semiannual maintenance.
Warning lights indicate
clogged oil coolers
Replace torn or
dry-rotted heat
shield tape
hey.
..it’s a nice
cool day. What’re
you so
hot
about?
my engine and
transmission oil
coolers are
clogged!
phew!
i feel like i’m
burning up!
That’s not exactly
what I had in mind when
I said my
heat shields
need
new tape!
Pour water here to
clean oil cooler
582. 16-17 (C)
4/4/01
10:13 PM
Page 1
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