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TM 9-8000
Figure 36-20. Tank Prepared for Deepwater Fording.
the venting; the other tube (12) is connected to the
cleaner functions in the same manner as other air
vacuum line tee (8) in the windshield wiper vacuum line.
cleaners, but it has a series of connecting tees by means
This vacuum connection provides positive ventilation and
of which the venting lines from the various accessories
will draw off any water that might possibly enter or collect
can be connected. As shown in figures 36-22 and 36-23,
in the distributor. The elbow, used as a connector at the
lines to the air cleaner are run from the fuel tank,
end of the windshield wiper vacuum tube, is connected to
distributor, brake master, and cylinder. in addition, note
the tube leading to the distributor.
that the air compressor (for the airbrakes) also draws its
air from the air cleaner. The flange to the left on the air
(6) The crankcase ventilation system must
cleaner shown in figure 36-23 provides a means of
be shut off during engine immersion. This is
connecting the air intake extension.
accomplished by having a breather shutoff valve (fig.
d. It is extremely important, in any fording
36-22) in the breather linked to a shutoff knob in the
driving compartment. When the valve is closed, a
operation, to observe the procedures outlined in the
pressure builds up in the engine crankcase that prevents
applicable technical manual. These procedures specify
the entrance of water.
the maximum depth of water to be forded by normal and
by deepwater fording, the speed at which the vehicle
c. A special type of air cleaner (fig. 36-23),
should be driven (3 to 4 mph), and the correct
mounted on the engine side of the dash panel, is used
transmission gear ratio (low or low-low).
with underwater ventilating systems. The air


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