i03751181
Maintenance
Recommendations
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.
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.
High Pressure Fuel Lines (If Equipped)
Contact with high pressure fuel may cause fluid
penetration and burn hazards. High pressure fuel
spray may cause a fire hazard. Failure to follow
these inspection, maintenance and service in-
structions may cause personal injury or death.
The high pressure fuel lines are the fuel lines that are
between the high pressure fuel pump and the high
pressure fuel manifold and the fuel lines that are
between the fuel manifold and cylinder head. These
fuel lines are different from fuel lines on other fuel
systems.
This is because of the following differences:
• The high pressure fuel lines are constantly
charged with high pressure.
• The internal pressures of the high pressure fuel
lines are higher than other types of fuel system.
Before any service or repair is performed on the
engine fuel lines, perform the following tasks:
1. Stop the engine.
2. Wait for ten minutes.
Do not loosen the high pressure fuel lines in order to
remove air pressure from the fuel system.
Engine Oil
To relieve pressure from the lubricating system, turn
off the engine.
i03751203
Welding on Engines with
Electronic Controls
NOTICE
Because the strength of the frame may decrease,
some manufacturers do not recommend welding onto
a chassis frame or rail. Consult the OEM of the equip-
ment or your Perkins dealer regarding welding on a
chassis frame or rail.
Correct welding procedures are necessary in order to
avoid damage to the engine's ECM, sensors, and
associated components. When possible, remove the
component from the unit and then weld the
component. If removal of the component is not
possible, the following procedure must be followed
when you weld on a unit that is equipped with a
Perkins Electronic Engine. The following procedure is
considered to be the safest procedure to weld on a
component. This procedure should provide a
minimum risk of damage to electronic components.
NOTICE
Do not ground the welder to electrical components
such as the ECM or sensors. Improper grounding
can cause damage to the drive train, the bearings,
hydraulic components, electrical components, and
other components.
Do not ground the welder across the centerline of the
package. Improper grounding could cause damage
to the bearings, the crankshaft, the rotor shaft, and
other components.
Clamp the ground cable from the welder to the com-
ponent that will be welded. Place the clamp as close
as possible to the weld. This will help reduce the pos-
sibility of damage.
Note: Perform the welding in areas that are free from
explosive hazards.
1. Stop the engine. Turn the switched power to the
OFF position.
2. Disconnect the negative battery cable from the
battery. If a battery disconnect switch is provided,
open the switch.
58
SEBU8311-09
Maintenance Section
Maintenance Recommendations
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