Mercedes-Benz OM 904 LA Operating Instructions Manual page 37

Safety
Safety precautions
The safety precautions in this section must
be observed to prevent injury to persons
and damage to the engine, components
and cable harness.
!
Do not start the engine unless the
3
batteries are securely connected.
Do not disconnect the batteries
with the engine running.
Do not use a rapid charger to start
the engine.
Only perform jump-starting with
separate batteries.
Note that the battery terminals
must be removed for rapid battery
charging. Observe the rapid charger
operating instructions.
34
!
Note that for electric welding work,
the batteries must be disconnected
and both cables ("+" and "–") se-
curely connected to each other.
The connectors for control units
must not be disconnected or con-
nected unless the electrical system
is switched off.
Incorrect polarity in the control unit
power supply (e.g. caused by incor-
rect battery polarity) can cause ir-
reparable damage to the control
units.
Tighten the connections on the fuel-
injection system to the specified
tightening torque.
!
The control units must be removed
if temperatures of over 80 °C
(e.g. in the drying oven) are expect-
ed.
Only use suitable test leads
(e.g. DaimlerChrysler connection
set) for taking measurements at
connections.
Telephones and two-way radios
that are not connected to an exteri-
or aerial can cause malfunctions in
the vehicle electronics system and
thereby jeopardise the operating
safety of the engine.