Walk-Around Inspection; Starting Motor - Inspect; Turbocharger - Inspect - Perkins 4006-23 Operation And Maintenance Manual

SEBU9077-01
Illustration 69
7. Unscrew the sensor (2) by one complete turn to
obtain a clearance (X) of 0.5 mm to 0.8 mm
(0.02 inch to 0.03 inch).
8. Tighten the locknut (1). Do not allow the sensor (2)
to rotate. Connect the connection (3).
9. Remove Tooling (A).
10. Restore the electrical supply to the engine.

Starting Motor - Inspect

If a starting motor fails, the engine may not start in an
emergency situation. A scheduled inspection of the
starting motors is recommended.
Note: Problems with the electric starting motor can
be caused by the following conditions: malfunction of
the solenoid and malfunction of the electric starting
system.
Inspect the electrical system for the following
conditions:
• Loose connections
• Corrosion
• Wires that are worn or frayed
• Cleanliness
Make repairs, if necessary.
The starting motor pinion and the flywheel ring gear
must be in good condition in order for the engine to
start properly. The engine will not start if the starting
motor pinion does not engage the flywheel ring gear.
The teeth of the starting motor pinion and the
flywheel ring gear can be damaged because of
irregular engagement.
Inspect the starting motors for proper operation.
Listen for grinding when the engine is started. Inspect
the teeth of the starting motor pinions and the
flywheel ring gear. Look for patterns of wear on the
teeth. Look for teeth that are broken or chipped. If
damaged teeth are found, the starting motor pinions
and the flywheel ring gear must be replaced.
Refer to the Disassembly and Assembly Manual for
information on removing the starting motors and
installing the starting motors.

Turbocharger - Inspect

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Periodic inspection and cleaning are recommended
for the turbochargers. Fouling of the turbine wheels
can contribute to loss of engine power and overall
loss of engine efficiency.
If a turbocharger fails during engine operation,
damage to the turbocharger compressor wheel and/
or to the engine may occur. Damage to a
turbocharger compressor wheel could allow parts
from the compressor wheel to enter an engine
cylinder. This debris can damage the pistons, the
valves, and the cylinder head.
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For information on inspection of the turbocharger,
refer to "Systems Operation Testing and
Adjusting"Turbocharger.

Walk-Around Inspection

A walk-around inspection should only take a few
minutes. When the time is taken to perform these
checks, costly repairs and accidents can be avoided.
For maximum engine service life, make a thorough
inspection of the engine compartment before starting
the engine. Look for items such as oil leaks or
coolant leaks, loose bolts, worn belts, loose
connections and trash buildup. Make repairs, as
needed:
• The guards must be in the correct place. Repair
damaged guards or replace missing guards.
• Wipe all caps and plugs before the engine is
serviced in order to reduce the chance of system
contamination.
81
Maintenance Section
Starting Motor - Inspect
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