Maintenance0011−1/A1 RT-flex50-D
Wärtsilä Switzerland Ltd
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3. Precautionary measures before beginning of maintenance work
Before starting any maintenance work on the engine (particularly on the running
gear), take the following precautionary measures:
⇒ Close the shut-off valves on the starting air bottles.
⇒ Close all the shut-off valves in the control air supply unit, and open the drains
on both air bottles until it is depressurized.
⇒ Close by hand the (automatic) shut-off valve for starting air and open the vent
and drain valve to the main starting air piping on the engine as well as the vent
valves on the shut-off valve for starting air, and leave them in this position until
maintenance work is completed.
⇒ Open all indicator cocks on the cylinder covers and leave them in this position
until maintenance work is completed.
⇒ Engage turning gear (gear pinion must be in engaged position) and lock the
lever (see also 3206−1 and 0750−1 in the Operating Manual).
D Where the engine has been stopped due to overheated running gear or
bearings, wait at least 20 minutes before opening the crankcase doors.
D The crankcase doors must always be locked with all the clamps when-
ever the engine is running, even if this is only for a short time in order to
make temperature checks (e.g. after changing bearings during an overhaul,
etc.).
D In the case of a fire in the engine having been extinguished by means of CO
2
,
the spaces affected must be well ventilated before work can be carried out
within them.
Attention! When performing electric welding near or on the engine, electromag-
netic fields or peak voltage may occur, which may damage the electronic compo-
nents of the WECS (W
ärtsilä Engine Control System).
Therefore, prior to performing electric welding in the vicinity of the mentioned com-
ponents, the following precautions must be taken:
D Stop the engine if it is in operation.
D Power off the electronic system and wait one minute.
D If the welding point is within a radius of two metres from an electronic module
and/or a sensor, disconnect the modules and/or sensors.
D Close the covers of all electric boxes and protect cables, sensors, etc. against
sparking and heat.
D Shield the check and control units with a conductive material and connect
them to earth.
D Run the welding cable from the welding apparatus directly to the welding point
without any unnecessary loops; also, avoid leading the welding cable parallel
to cables of the electronic control unit.
2010
Safety Measures and Warnings
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