MTU Gas engine8 V 4000 L62 Operating Instructions Manual page 10

If starters with beryllium copper pinions are installed, the following also applies:
• To avoid health risks with the pinion containing beryllium, breathing protection of filter class P2 must
be worn during maintenance work. Do not blow out the interior of the flywheel housing and the starter
with compressed air. The interior of the flywheel housing must be additionally cleaned with a dust-
removal machine of class H.
Welding work
Never carry out welding work on the assembly or engine plant or mounted units. Cover the engine when
welding in its vicinity.
Observe the following before starting welding work on the MTU electronic system:
• Switch the main power switch to "OFF".
• Disconnect the cables and the negative and positive poles of the battery.
Do not use the assembly or plant as a ground terminal.
Never place the welding cable across or near wiring harnesses of MTU plants. The welding current may
otherwise induce an interference voltage in the wiring harnesses which could damage the electrical sys‐
tem.
If welding has to be carried out on components (e.g. exhaust manifold), these components must first be
removed from the engine.
Hydraulic installation and removal
Check the tools and devices to be used for perfect operation and safe condition. Only use the specified
devices for force-fitting/removing parts.
Observe the maximum press-on pressure for the device for force-fitting/removing parts.
Do not attempt to bend or exert force on H.P. lines.
Observe the following before starting the pressing procedure:
• Bleed air from the device for force-fitting/removing parts, pumps and piping at the points provided for
the system concerned (e.g. open threaded vent plugs, pump until no bubbles can be discerned in the
oil, close threaded vent plugs).
• During the installation procedure, screw on device with pushed-in plunger.
• During the removal procedure, screw on device with retracted plunger.
For a hydraulic installation/removal tool with central expansion pressure supply, screw spindle into shaft
end until correct sealing is established.
During hydraulic installation/removal of components, ensure that no persons are in the direct vicinity of
the component being pressed.
Working on electrical/electronic assemblies
Before starting any maintenance or repair work, or before switching off any electronic components nec‐
essary to carry out the work, permission must first be obtained from the relevant manager or supervisor.
Before work is carried out on the assemblies, the power supply to the relevant areas must be switched
off.
Do not damage wiring during the removal work. When reinstalling, ensure that the wiring cannot be dam‐
aged during engine operation through contact with sharp edges, rubbing against a component or through
contact with a hot surface.
Do not secure cables on lines carrying fluids.
Do not use cable clamps to secure the lines.
Observe the following when working with batteries:
• Avoid sparks and naked flames.
• Keep electrolyte away from the skin and clothing. Wear protective goggles.
• Do not place tools on the battery.
• Before connecting the cable to the battery, check the battery polarity.
10 | Safety | MS150032/02E 2012-07