SECTION III. REPAIR OF OIL SYSTEM COMPONENTS

TM 5-4320-258-34

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).

paragraph 3-13.

(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