Turbocharger - Inspect; Starting Motor - Inspect - Perkins 2506 Operation And Maintenance Manual

SEBU8313-02
• Failure to use recommended fuel, lubricants and
coolant or antifreeze

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 proper operation. Check
the electrical connections and clean the electrical
connections. Refer to the Service Manual for more
information on the checking procedure and for
specifications or consult your Perkins distributors for
assistance.

Turbocharger - Inspect

Periodic inspection and cleaning is recommended for
the turbocharger compressor housing (inlet side).
Any fumes from the crankcase are filtered through
the air inlet system. Therefore, by-products from oil
and from combustion can collect in the turbocharger
compressor housing. Over time, this buildup can
contribute to loss of engine power, increased black
smoke and overall loss of engine efficiency.
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.
NOTICE
Turbocharger bearing failures can cause large quan-
tities of oil to enter the air inlet and exhaust systems.
Loss of engine lubricant can result in serious engine
damage.
Minor leakage of a turbocharger housing under ex-
tended low idle operation should not cause problems
as long as a turbocharger bearing failure has not
occurred.
When a turbocharger bearing failure is accompanied
by a significant engine performance loss (exhaust
smoke or engine rpm up at no load), do not continue
engine operation until the turbocharger is repaired or
replaced.
An inspection of the turbocharger can minimize
unscheduled downtime. An inspection of the
turbocharger can also reduce the chance for potential
damage to other engine parts.
Note: Turbocharger components require precision
clearances. The turbocharger cartridge must be
balanced due to high rpm. Severe Service
Applications can accelerate component wear. Severe
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Service Applications require more frequent
inspections of the cartridge.
Removal and Installation
For options regarding the removal, installation, repair
and replacement, consult your Perkins distributor.
Refer to the Service Manual for this engine for the
procedure and specifications.
Cleaning and Inspecting
1. Remove the exhaust outlet piping and remove the
air inlet piping from the turbocharger. Visually
inspect the piping for the presence of oil. Clean the
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interior of the pipes in order to prevent dirt from
entering during reassembly.
2. Turn the compressor wheel and the turbine wheel
by hand. The assembly should turn freely. Inspect
the compressor wheel and the turbine wheel for
contact with the turbocharger housing. There
should not be any visible signs of contact between
the turbine wheel or compressor wheel and the
turbocharger housing. If there is any indication of
contact between the rotating turbine wheel or the
compressor wheel and the turbocharger housing,
the turbocharger must be reconditioned.
3. Check the compressor wheel for cleanliness. If
only the blade side of the wheel is dirty, dirt and/or
moisture is passing through the air filtering
system. If oil is found only on the back side of the
wheel, there is a possibility of a failed turbocharger
oil seal.
The presence of oil may be the result of extended
engine operation at low idle. The presence of oil
may also be the result of a restriction of the line for
the inlet air (plugged air filters), which causes the
turbocharger to slobber.
4. Use a dial indicator to check the end clearance on
the shaft. If the measured end play is greater than
the Service Manual specifications, the
turbocharger should be repaired or replaced. An
end play measurement that is less than the
minimum Service Manual specifications could
indicate carbon buildup on the turbine wheel. The
turbocharger should be disassembled for cleaning
and for inspection if the measured end play is less
than the minimum Service Manual specifications.
5. Inspect the bore of the turbine housing for
corrosion.
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Maintenance Section
Starting Motor - Inspect