ARMY TM 9-6115-604-12
NAVY NAVFAC P-633-12
MAINTENANCE OF OIL HEATER H113 AND LUBRICANT TEMPERATURE THERMOSTAT S101. The oil
heater H113 and lubricant temperature thermostat S101 are used to preheat oil in the engine sump to aid in cold weather
starting. See Figure 3-3.
Remove. The oil heater H113 is threaded into the left side of the oil pan, and the thermostat S101 is threaded into
the right side of the oil pan.
(1) Using a suitable container, drain the oil pan.
Remove oil heater H 113 and thermostat S101 by tagging and disconnecting wires, and unthreading heater
and thermostat from oil pan.
Test. Set multimeter to RX1 K scale and connect leads across two black wires on heater H113. Resistance should
be 175 ± 27 ohms.
Install oil heater H113 and thermostat S101 by threading into pan. Reconnect wires and remove tags.
Refill crankcase In accordance with paragraph 3-3.
4-73. MAINTENANCE OF PRELUBE PUMP. See Figure 3-3. The prelube pump provides initial lubrication to the
engine prior to engine start and is manually operated by PRELUBE SYS switch S5 on panel C in the generator set
control room. The prelube pump is bolted to the skid base by the right rear engine mount; when operated, it draws oil
from the engine oil sump and delivers it under pressure to the engine oil passages
Test Perform STEP 1 through STEP 6, Figure 2-13, and ensure that oil pressure rises steadily and then stabilizes.
Do not start engine.
Replace See Figure 3-3.
Disconnect oil lines at pump and plug to prevent contamination Raise oil lines above oil pan and secure.
Remove elbow, and pipe adapter from the prelube pump.
Disconnect electrical plug.
Remove the hexagon head capscrews, lockwashers, and hexagonal nuts securing the prelube pump to the
Install the new prelube pump on the bracket with the hexagon head capscrews, lockwashers, and hexagonal
Install the elbow, pipe adapter, and hose assemblies to the prelube pump.
Reinstall electrical plug. Check engine oil level and add lube oil If necessary.
Test the prelube pump In accordance with step a, above.
MAINTENANCE OF ENGINE
4-74. GENERAL. See Figure 3-3 The engine is a V configuration 12-cylinder diesel with a displacement of 2300 cubic
inches (37 7 liters). The engine operates on the four stroke cycle principle and has two exhaust valves and two Intake
valves for each cylinder Turbochargers are used to Increase power output by improving air Induction. The turbocharged
air is aftercooled to provide denser air for combustion, and to reduce exhaust temperatures Replaceable cartridge-type
filters are provided for the fuel, lubricating, and coolant systems. In the four stroke cycle diesel engine the following
series of events take place during the intake, compression, power, and exhaust strokes.
a. Intake Stroke. The exhaust valves are closed, the Intake valves are open, and downward movement of the
piston creates a partial vacuum in the cylinder. Air moves through the Intake manifold and open Intake valves
to fill the cylinder. (At engine operating speeds, additional air is forced into the cylinder by the turbocharger.
This air is in addition to what would normally be taken in at atmospheric pressures and greatly increases
cylinder filling efficiency and power output.).