Maintenance
Recommendations
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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 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 between the high-
pressure fuel pump and the high-pressure fuel
manifold. The high-pressure fuel lines are also
between the fuel manifold and cylinder head. These
fuel lines are different from fuel lines on other fuel
systems.
The following are the 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 10 minutes.
Do not loosen the high-pressure fuel lines to remove
air pressure from the fuel system.
Engine Oil
To relieve pressure from the lubricating system, turn
off the engine.
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Severe Service Application
Severe service is the application of an engine that
exceeds the current published standards for that
engine range. Or results in the engine being used at
the extremes of certain operating conditions.
• Performance such as power range, speed range,
and fuel consumption
• Fuel quality
• Operational Altitude
• Maintenance intervals
• Oil selection and maintenance
• Coolant type and maintenance
• Environmental qualities
• Installation
• The temperature of the fluid in the engine
Refer to the standards for the engine or consult your
Perkins distributor to determine if the engine is
operating within the defined parameters.
Severe service operation can accelerate component
wear. Engines that operate under severe conditions
may need more frequent maintenance intervals to
ensure maximum reliability and retention of full
service life.
Due to individual applications, it is not possible to
identify all the factors which can contribute to severe
service operation. Consult your Perkins distributor for
the unique maintenance that is necessary for the
engine.
The operating environment, incorrect operating
procedures, and incorrect maintenance procedures
can be factors which contribute to a severe service
application.
Environmental Factors
Ambient temperatures – The engine may be
exposed to extended operation in extremely cold
environments or hot environments. Valve
components can be damaged by carbon buildup if
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Maintenance Section
Maintenance Recommendations
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