Note:
Maximum permitted valve seat wear is 1.5 mm
(0.05906 inch).
In this example, the valves are still serviceable after
4000 hours running.
When the valves approach the maximum wear limit,
the rockers can be removed and a measurement
from the cylinder head face to the top of the valve
stems can be taken. When a new valve is installed,
the protrusion of the valve stem would be 29.75 mm
(1.171 inch). therefore, a maximum wear limit would
be 30.75 mm (1.211 inch).
i06533861
Radiator
-
Clean
Note:
Adjust the frequency of cleaning according to
the effects of the operating environment. The radiator
and the aftercooler are a combined unit ensure that
the aftercooler is also cleaned and inspected.
Inspect the radiator and aftercooler for these items:
Damaged fins, corrosion, dirt, grease, insects,
leaves, oil, and other debris. Clean the radiator and
aftercooler, if necessary.
Personal injury can result from air pressure.
Personal injury can result without following prop-
er procedure. When using pressure air, wear a
protective face shield and protective clothing.
Maximum air pressure at the nozzle must be less
than 205 kPa (30 psi) for cleaning purposes.
Pressurized air is the preferred method for removing
loose debris. Direct the air in the opposite direction to
the fans air flow. Hold the nozzle approximately 6 mm
(0.25 inch) away from the radiator fins. Slowly move
the air nozzle in a direction that is parallel with the
radiator tube assembly. This action will remove
debris that is between the tubes.
Pressurized water may also be used for cleaning.
The maximum water pressure for cleaning purposes
must be less than 275 kPa (40 psi). Use pressurized
water to soften mud. Clean the core from both sides.
Use a degreaser and steam for removal of oil and
grease. Clean both sides of the core. Wash the core
with detergent and hot water. Thoroughly rinse the
core with clean water.
After cleaning the radiator and aftercooler, start the
engine. Run the engine. This action helps remove
debris and the drying of the core. Stop the engine.
Use a light bulb behind the core to inspect the core
for cleanliness. Repeat the cleaning, if necessary.
Inspect the fins for damage. Bent fins may be opened
with a “comb”. Inspect these items for good condition:
Welds, mounting brackets, air lines, connections,
clamps, and seals. Make repairs, if necessary.
i06543387
Severe Service Application -
Check
Severe service is the application of an engine that
exceeds the current published standards for that
engine. Perkins maintains standards for the following
engine parameters:
• 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.
Perkins engines are unable to identify all the factors
which can contribute to severe service operation, due
to individual applications. Consult your Perkins
dealer or 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 inextremely cold
environments or hot environments. Valve
components can be damaged by carbon buildup if
the engine is frequently started and stopped invery
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