Perkins 1106AA-70TG1 Operation And Maintenance Manual page 75

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3. Drain the coolant from the cooling system to a
level that is below the hose that is being replaced.
4. Remove the hose clamps.
5. Disconnect the old hose.
6. Replace the old hose with a new hose.
7. Install the hose clamps with a torque wrench.
Note: For the correct coolant, see this Operation and
Maintenance Manual, "Fluid Recommendations".
8. Refill the cooling system. Refer to the OEM
information for further information on refilling the
cooling system.
9. Clean the cooling system filler cap. Inspect the
cooling system filler cap's seals. Replace the
cooling system filler cap if the seals are damaged.
Install the cooling system filler cap.
10. Start the engine. Inspect the cooling system for
leaks.
Radiator - Clean
The radiator is not usually supplied by Perkins. The
following text describes a typical cleaning procedure
for the radiator. Refer to the OEM information for
further information on cleaning the radiator.
Note: Adjust the frequency of cleaning according to
the effects of the operating environment.
Inspect the radiator for these items: Damaged fins,
corrosion, dirt, grease, insects, leaves, oil and other
debris. Clean the radiator, 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 fan's 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 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 in order 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.
If the radiator is blocked internally, refer to the OEM
Manual for information regarding flushing the cooling
system.
After cleaning the radiator, start the engine. Allow the
engine to operate at low idle speed for three to five
minutes. Accelerate the engine to high idle. This will
help in the removal of debris and the drying of the
core. Slowly reduce the engine speed to low idle and
then stop the engine. Use a light bulb behind the core
in order 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,
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clamps and seals. Make repairs, if necessary.
Starting Motor - Inspect
Perkins recommends a scheduled inspection of the
starting motor. If the starting motor fails, the engine
may not start in an emergency situation.
Check the starting motor for correct operation. Check
the electrical connections and clean the electrical
connections. Refer to the Systems Operation, Testing
and Adjusting Manual, "Electric Starting System -
Test" for more information on the checking procedure
and for specifications or consult your Perkins dealer
or your Perkins distributor for assistance.
Turbocharger - Inspect
A regular visual inspection of the turbocharger is
recommended. If the turbocharger fails during engine
operation, damage to the turbocharger compressor
wheel and/or to the engine may occur. Damage to
the turbocharger compressor wheel can cause
additional damage to the pistons, the valves, and the
cylinder head.
75
Maintenance Section
Radiator - Clean
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