IMPORTANT: If the engine won’t start, check the
main engine power fuses. The fuses are located
along the main engine electrical harness on the
left frame rail, near the batteries. If the fuses are
blown, replace the fuses. Be sure to find the
cause of the blown fuses as soon as possible.
NOTE: Some starters are equipped with op-
tional overcrank protection. If overcranking oc-
curs, a thermostat breaks the electrical circuit to
the starter motor until the motor has cooled.
WARNING
Never pour fuel or other flammable liquid into the
air inlet opening in the air intake in an attempt to
start the vehicle. This could result in a flash fire
causing serious personal injury or property dam-
age.
3.
Check the oil pressure gauge immediately after
starting the engine.
4.
If no pressure registers within 10 to 15 seconds
or the ENGINE PROTECT indicator comes on,
shut down the engine and check the lubricating
oil system.
CAUTION
Protect the turbocharger during the start-up by
not opening the throttle or accelerating the en-
gine above 1000 rpm until minimum engine idle
oil pressure of 12 psi (83 kPa) registers on the
gauge.
5.
Idle the engine for about five minutes at 1000
rpm before operating the engine under load.
Mercedes-Benz
NOTE: Before doing these steps, do the steps
in "Prestart."
CAUTION
Never attempt to start any Mercedes-Benz elec-
tronic engine using ether or any other starting
fluid. Serious engine damage could result.
1.
Turn the ignition switch to the on position. See
Fig. 7.7. All the electronic gauges on the ICU
(instrumentation control unit) complete a full
sweep of their dials, the warning and indicator
lights light up, and the buzzer sounds for three
seconds.
IMPORTANT: On vehicles equipped with an in-
take air preheater, the INTAKE HEATER indica-
tor stays on for a minimum of two seconds, re-
gardless of coolant temperature. Wait until the
INTAKE HEATER indicator goes out before at-
tempting to start the engine.
2.
Turn the ignition switch to the start position.
Without touching the throttle pedal, start the en-
gine.
NOTE: Some starters are equipped with op-
tional overcrank protection. If overcranking oc-
curs, a thermostat breaks the electrical circuit to
the starter motor until the motor has cooled.
3.
It is not necessary to idle the engine before en-
gaging or starting the operation, but load should
be applied gradually during the warm-up period
until the oil temperature reaches 140°F (60°C).
4.
Check the oil pressure gauge for any drop in lu-
bricating oil pressure or mechanical malfunction
in the lubricating oil system. Minimum oil pres-
sure at idle is 7 psi (50 kPa).
CAUTION
Do not rev the engine if the oil pressure gauge
indicates no oil pressure. Shut down the engine
if no oil pressure appears within approximately
ten seconds. Check to determine the cause of the
problem. Operating the engine with no oil pres-
sure will damage the engine.
Cold-Weather Starting
Modern electronic engines do not normally require
special starting aids. At low temperatures, oil pan
heaters or water jacket heaters are sometimes used
to assist in starting.
Caterpillar
WARNING
If using a cold-weather-start system, be sure to
follow the manufacturer’s instructions regarding
Engines and Clutches
7.8
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