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NOTE: On coach engines equipped
with Delco 50 DN alternators and
mechanical unit injectors the optimum
low idle speed setting with full accessory
load and the transmission in neutral is:
6V-92 — 650 rpm
8V-92 — 550 rpm
Stopping the Engine
Normal Stopping
1. Reduce engine speed to normal idle
and put all shift levers in the neutral
position.
2. Allow the engine to run between idle
and 1,000 rpm with no load for four
(4) or five (5) minutes. This allows the
engine to cool and permits the tur-
bocharger to slow down. After four or
five minutes, shut down the engine.
NOTICE:
Stopping a turbocharged engine
immediately after high speed opera-
tion may cause damage to the tur-
bocharger, as it will continue to turn
without an oil supply to the bearings.
Emergency Stopping
The emergency shutdown should be
used only when the engine does not
respond to the normal stop engine
procedure.
To shut down the engine, simply acti-
vate the emergency shutdown control.
This is an electrical switch or mechani-
cal lever which is normally identified as
such on the control panel.
NOTICE:
Never use the emergency shutdown
system, except in an emergency.
Use of the emergency shutdown can
cause lubricating oil to be sucked
past the oil seals and into the blower
and may also cause turbocharger
damage.
The air shutdown, located in the air
inlet housing, must be reset by hand
and the "emergency stop" knob
pushed in before the engine is ready to
start again.
NOTICE:
If the emergency air shutdown is
used to stop the engine in an emer-
gency situation, always have the shut-
down checked for damage and for
proper operation before the vehicle,
vessel, or machine is returned to ser-
vice. This is especially important if
shutdown is made at high engine
rpm. To ensure positive valve closure
should another emergency shutdown
be required, the shutdown must be
checked and required repairs or
adjustments made at this time.
Failure to observe this precaution
may permit engine run-on when the
emergency shutdown is activated.
10
Emergency Jump
Starting
Use the following procedure to start
the engine of a vehicle with a "low bat-
tery" or one that will not crank the
engine fast enough to start.
NOTICE:
Do not use this procedure if the
battery of the disabled vehicle will
not accept a charge or is frozen.
Attempting to start the vehicle
under these conditions may result
in cranking system damage.
The DDEC II electronic control sys-
tem operates on 12 volts DC. If a
DDEC II engine with an electric start-
ing motor requires emergency jump
starting, do not exceed 16 volts DC.
The DDEC III electronic control sys-
tem operates on 12 or 24 volts DC. If a
DDEC III engine with an electric start-
ing motor requires emergency jump
starting, do not exceed 32 volts DC.
NOTICE:
Jump starting with voltages greater
than those indicated or reversing bat-
tery polarity may damage the ECM
(electronic control module).
CAUTION:
The following procedure must be
performed exactly as outlined.
Failure to observe precautions
and/or follow this sequence may
result in injury to the face, eyes,
body, limbs, and respiratory sys-
tem caused by fire or acid from
battery explosion. Property dam-
age could also result.
CAUTION:
Reversing battery polarity can also
result in personal injury caused by
the sudden discharge of elec-
trolyte from the battery vents
and/or the sudden rupture of the
battery case caused by explosion
of internal hydrogen gas.
1. Prevent shorting of the system by
removing metal rings, watches, or
jewelry and not allowing metal tools
to contact the positive terminal of
the battery.
2. Place the transmission of the dis-
abled vehicle in neutral, set the
parking brake, and turn the ignition
to the off position.
3. Turn off lights, heater, air condition-
er, and any other electrical loads in
the disabled vehicle and the boost-
er vehicle.
4. Wear eye protection if available, or
shield eyes when near either bat-
tery.
5. Do not allow vehicle bodies or
bumpers to touch.
6. Connect one end of the first jumper
cable to the positive (+) terminal of
the dead battery. Connect the other
end to the positive (+) terminal of
the booster battery.
7. Connect one end of the second
jumper cable to the negative (–) ter-
minal of the booster battery.
Connect the other end to an engine
bolt head or good metallic contact
(ground) on the disabled vehicle.
11
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