•
Abnormal sounds suddenly occur in the engine
or turbocharger.
1.
With the vehicle stopped, apply the parking
brakes and place the transmission in neutral.
CAUTION
Idle the engine one to two minutes before shut-
ting it down, if this can be done without damage
to the engine. After hard operation, shutting
down the engine without idling may cause dam-
age to the turbocharger.
2.
Allow the engine to idle one to two minutes be-
fore shutting it down. This allows the lubricating
oil and the coolant to carry heat away from the
combustion chambers, bearings, shafts, and
seals. The extreme heat may cause bearings to
seize or oil seals to leak.
IMPORTANT: Bearings and seals in the turbo-
charger are subjected to the high heat of com-
bustion exhaust gases. While the engine is run-
ning, this heat is carried away by oil circulation,
but if the engine is stopped suddenly, the turbo-
charger temperature may rise as much as 115°F
(63°C).
CAUTION
Except in emergency, do not shut down the
MBE4000 engine when the coolant temperature is
above 194°F (90°C). To do so could damage the
engine.
3.
Turn off the ignition switch and shut down the
engine.
Engine Braking System—CAT,
Cummins, DDE S60, M-B
Jacobs Engine Brake
A Jacobs engine brake is a hydraulic-electric engine
attachment that converts a diesel engine into an air
compressor. This is done by changing engine ex-
haust valve operation. An engine brake is not a sub-
stitute for a service braking system, except in emer-
gencies, because it does not provide the precise
control available from the service brakes.
The Jake Brake is controlled by a single, dash-
mounted paddle switch with three positions: OFF, LO
and HI.
Jacobs Engine Brake Operation
WARNING
Do not use the engine brake if road surfaces are
slippery. Using the engine brake on wet, icy, or
snow-covered roads could result in loss of ve-
hicle control, possibly causing personal injury
and property damage.
To engage the engine brake, the dash switch must
be in the LO or HI position and both the clutch and
throttle pedals must be fully released. To disengage
the engine brake, depress the throttle or clutch
pedal, or move the dash switch to OFF. Use the LO
position when driving on flat, open stretches of road.
If you need to use the service brakes to slow down,
switch to a higher position until there is no need for
the service brakes.
WARNING
The engine brake must be disengaged when
shifting gears. The clutch must be used if the
dash switch is in the LO or HI position. If the en-
gine brake is engaged when the transmission is
in neutral, the braking power of the engine brake
can stall the engine, which could result in loss of
vehicle control, possibly causing personal injury
and property damage.
Since the engine brake is most effective at rated en-
gine speed, gear selection is very important. Gearing
down the vehicle within the limits of the rated engine
speed makes the engine brake more effective. Rec-
ommended engine braking speed is above 1800 rpm
and below the rated speed.
IMPORTANT: Maximum retarder performance is
obtained when you use the lowest possible gear
without exceeding the recommended engine
braking speed.
"Control speed" is the speed at which the engine
brake performs 100 percent of the required downhill
braking, resulting in a constant speed of descent.
The control speed varies, depending on vehicle
weight and the downhill grade.
Engines and Clutches
7.20
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