Continuous Brake; Driving Tips - Mercedes-Benz OM 904-926 LA BlueTec Operating Instructions Manual

Driving tips

40
Let the engine idle for approximately two
minutes before switching off the engine if:
the coolant temperature is very high (over
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90 †).
the engine has been operated at full output.
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X
To switch off the engine: turn the vehicle
key in the ignition lock back to the stop at
position u.
X
Press the start/stop button on the engine
or on the engine shutoff device on the
equipment.
X
Safeguard the vehicle/equipment against
rolling away.
! Stop the engine immediately if:
the oil pressure falls or fluctuates signif-
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icantly.
the power output or engine speed
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decreases and the position of the posi-
tion sensor (accelerator) remains con-
stant.
heavy smoke is emitted from the
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exhaust.
the coolant or engine oil temperature
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rises steeply.
abnormal noises suddenly come from
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the engine or exhaust gas turbocharger.
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When you switch off the engine, Blue-
®
Tec exhaust gas aftertreatment automat-
ically flushes the exhaust system with fresh
air. Residues of AdBlue
metering unit or the injection nozzle might
otherwise impair the function of BlueTec
exhaust gas aftertreatment. Depending on
the engine's previous operating load, Blue-
®
Tec exhaust gas aftertreatment may flush
the exhaust system several times.
When BlueTec
flushes the exhaust system, an air valve is
activated. You may then hear a hissing
sound. This hissing sound does not indicate
a leak in the compressed-air system.
®
/DEF on the
®
exhaust gas aftertreatment

Continuous brake

The airbrake and the constantly open throttle
valves are employed as continuous brakes.
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WARNING
Do not activate the continuous brake (engine
brake/retarder) on slippery road surfaces.
The wheels may otherwise become locked
and the vehicle could skid.
You can utilise the engine's braking effect,
particularly on long downhill gradients, if you:
activate the continuous brake
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shift to a lower gear in good time
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Driving tips
Running-in
Equipment
Observe the equipment manufacturer's run-
ning-in notes.
Vehicles
The running-in period of the engine has a sig-
nificant effect on the vehicle, especially for
the:
service life
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operating reliability
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economy
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Observe the following notes during the run-
®
ning-in period up to 2000 km (30 operating
hours):
avoid subjecting the engine to full load.
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run-in the engine with care using differing
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speeds and engine revs.
avoid high engine revs.
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do not drive at more than ¾ of the maxi-
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mum road speed for each gear.
change gear in good time.
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do not shift down to brake the vehicle.
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in the case of vehicles with automatic
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transmission, do not press the accelerator