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Page Title: SECTION III. REPAIR OF OIL SYSTEM COMPONENTS
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TM 5-4320-258-34
b.
Cleaning and Inspection.
of the switch.  No continuity should be indicated at
normal temperatures.
(1) Wipe the coolant temperature safety
(2) Heat the container while watching the
switch with a cloth dampened with cleaning solvent
thermometer and the multimeter.
As the water
(FED. Spec. P-D-680); dry thoroughly.
temperature  reaches  approximately  2100F,  the
(2) Inspect the coolant temperature safety
multimeter should indicate continuity through the switch.
switch for broken, loose, or corroded terminals, severe
(3) If the switch remains open, or closes at
dents, and other obvious damage. Check and adjust the
too low a temperature, loosen the lock nut on the
switch as directed in subparagraph c below.
c.  Testing and Adjustment.
adjusting screw (3, fig. 3-7) and adjust the switch so
that it just closes at 2100F. Lock the lock nut to secure
(1) Suspend the sender of the coolant
the adjustment.
temperature safety switch and a thermometer in a
d.  Installation.  Installation is the reverse of
container so that neither the sender nor the thermometer
removal. Refer to items I through 4 in figure 3-9. If
touches the sides or bottom of the container. Connect a
necessary, refer to the wiring diagram, figure 1-3, for
multimeter, set to read continuity, across the terminals
wiring connection information.
SECTION III. REPAIR OF OIL SYSTEM COMPONENTS
3-10.
Description of Engine Oil System
c.  The engine is protected from a low oil
a.  The engine oil system provides lubrication
pressure condition by an oil pressure safety switch (1,
fig. 3- 7) mounted on the engine control panel. This
for the working surfaces within the engine. The oil is
switch is adjustable and provides a reset push- button to
retained in the oil pan under the engine and is circulated
reset the device for starting.
through the engine by the oil pump mounted on one of
3-11. Engine Oil Filter
the main bearing caps of the engine.
Internal
a.  Removal.
components of the engine lubrication system are
covered in chapter 4, which describes basic engine
(1) Drain the oil from the engine (TM 5-
overhaul.  Oil pressure ad- justment is described in
4320-258-12).
(2) Disconnect the electrical lead from the
b.  An oil filter with its related piping is
oil pressure sender on the filter piping.
mounted on the exterior of the engine to remove from
(3) Remove the oil filter and related parts
the engine oil impurities and particles that could cause
from the engine as shown in figure 3-10
engine wear.
This filter has a replaceable-type
cartridge.
3-14

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