Engine Braking Systems-Cat, Cummins, Dde S60, M-B - freightliner Columbia Driver Manual

accelerated wear of the engine components. Ex-
cessive temperatures in the turbocharger center-
housing will cause oil coking problems. Follow
the procedure, outlined below, to allow the en-
gine to cool.
1. With the vehicle stopped, apply the parking
brakes. Reduce the engine speed to low idle.
2.
Place the transmission shift lever in neutral.
NOTE: If the engine has been operating at low
loads, run it at low idle for 30 seconds before
stopping. If the engine has been operating at
highway speed or at high loads, run it at low
idle for three minutes to reduce and stabilize
internal engine temperatures before stopping.
3. Turn off the ignition switch and shut down the
engine.
4. After engine shutdown, fill the fuel tank.
5.
Check the crankcase oil level. Maintain the oil
level between the add and full marks on the dip-
stick.
6.
If equipped with an idle shutdown timer, it can be
set to shut the engine down after a preset
amount of time. Ninety seconds before the pre-
set shutdown time, the CHECK ENGINE light will
begin to flash at a rapid rate. If the clutch pedal
or service brake indicate a position change dur-
ing this final ninety seconds (diagnostic lamp
flashing), the idle shutdown timer will be disabled
until reset.
7. If freezing temperatures are expected, allow the
engine jacket water expansion tank to cool, then
check the coolant for proper antifreeze protec-
tion. The cooling system must be protected
against freezing to the lowest expected outside
temperature. Add permanent-type antifreeze, if
required.
8. Repair any leaks, perform minor adjustments,
tighten loose bolts, etc. Observe the vehicle mile-
age or the service meter reading, if so equipped.
Perform periodic maintenance as instructed in
the Maintenance Interval Schedule in the Cater-
pillar Operation and Maintenance Manual .
Detroit Diesel S60
1. With the vehicle stopped, apply the parking
brakes, and place the transmission in neutral.
Engines and Clutches
2. Allow the engine to run at idle for four to five
minutes. This allows the engine to cool and the
turbocharger to slow down.
CAUTION
After high-speed operation, shutting down the
engine without idling may cause damage to the
turbocharger, as it will continue to turn without
an oil supply to the bearings.
3.
Turn off the ignition switch and shut down the
engine.
Mercedes-Benz
1. With the vehicle stopped, apply the parking
brakes and put the transmission in neutral.
2. Allow the engine to idle for one to 2 minutes be-
fore shutting it down.
3.
Shut down the engine by turning off the ignition.
Engine Braking Systems—CAT,
Cummins, DDE S60, M-B
Several types of engine braking systems are option-
ally available. Each of these systems uses the en-
gine to retard the vehicle on downgrades and re-
duces the heat load on the service brakes. The
engine brakes are meant to be auxiliary vehicle brak-
ing systems in addition to the regular service brakes.
®
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.
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