Maintenance
Recommendations
i04056177
System Pressure Release
Coolant System
Pressurized system: Hot coolant can cause seri-
ous burn. To open cap, stop engine, wait until ra-
diator is cool. Then loosen cap slowly to relieve
the pressure.
Ensure that the power supply is isolated before any
service or repair is performed.
To relieve the pressure from the coolant system, turn
off the engine. Allow the cooling system pressure cap
to cool. Remove the cooling system pressure cap
slowly in order to relieve pressure.
Fuel System
To relieve the pressure from the fuel system, turn off
the engine.
Engine Oil
To relieve pressure from the lubricating system, turn
off the engine.
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Welding on Engines with
Electronic Controls
Correct welding procedures are necessary in order to
avoid damage to the following components:
• Electronic Control Module (ECM) on the engine
• Clean Emissions Module (CEM)
• Sensors
• Associated components
Components for the driven equipment should also be
considered. When possible, remove the component
that requires welding. When welding on an engine
that is equipped with an ECM and removal of the
component is not possible, the following procedure
must be followed. This procedure minimizes the risk
to the electronic components.
1. Stop the engine. Remove the electrical power from
the ECM.
2. Ensure that the fuel supply to the engine is turned
off.
3. Disconnect the negative battery cable from the
battery. If a battery disconnect switch is installed,
open the switch.
4. Disconnect all electronic components from the
wiring harnesses. Include the following
components:
• Electronic components for the driven equipment
• ECM
• Sensors
• Electronically controlled valves
• Relays
• Aftertreatment ID module
NOTICE
Do not use electrical components (ECM or ECM sen-
sors) or electronic component grounding points for
grounding the welder.
70 SEBU8609
Maintenance Recommendations
System Pressure Release
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