Inlet Air System - Inspect - Perkins 4006 TRS Gas Operation And Maintenance Manual

SEBU8190-02

Inlet Air System - Inspect

Inspect the components of the air inlet system for the
following conditions:
• Cracks
• Leaks
• Loose connections
Inspect the following components:
• Piping between the air cleaner and the
turbocharger
• Turbocharger
• Piping between the turbocharger and the
aftercooler
• Aftercooler
• Connection of the aftercooler to the air inlet
manifold
• Connection of the air inlet manifold to the cylinder
head
Ensure that all of the connections are secure. Ensure
that the components are in good condition.
Overhaul (In-Frame)
Scheduling an In-Frame Overhaul
Scheduling an in-frame overhaul normally depends
on the following conditions:
• An increase of oil consumption
• An increase of crankcase blowby
• A decrease or a variation of cylinder compression
Each individual condition may not indicate a need for
an overhaul. However, evaluating the three
conditions together is the most accurate method of
determining when an overhaul is necessary.
The engine does not require an overhaul if the
engine is operating within acceptable limits for oil
consumption, crankcase blowby, and cylinder
compression.
Periodically measure each of the three conditions.
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The first measurement should occur during the
engine commissioning. This establishes a baseline
for future measurements. Additional measurements
are scheduled at regular intervals in order to
determine a schedule for the next in-frame overhaul.
The following changes in the three conditions
normally require a scheduled overhaul:
• An increase in oil consumption
• An increase in crankcase blowby
• A loss of cylinder compression
Note: Oil consumption will be initially high. This will
be reduced when the rings are seated to the bore.
Note: These indications do not require an engine to
be shut down for service. These indications only
mean that an engine should be scheduled for service
in the near future. If the engine operation is
satisfactory, an immediate overhaul is not a
requirement.
Monitor the engine as the engine accumulates
service hours.
Usually, an in-frame overhaul does not require
removal of the engine. Instead, the service is
performed with the engine in place.
In-Frame Overhaul Information
An in-frame overhaul includes all of the work that is
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done for a top end overhaul. Additionally, some other
components that wear are replaced. The condition of
components is inspected. Those components are
replaced, if necessary.
Your Perkins dealer can provide these services and
components. Your Perkins dealer can ensure that the
components are operating within the appropriate
specifications.
Overhaul (Major)
Scheduling a Major Overhaul
Generally, a major overhaul is performed at 64000
hours. The need for a major overhaul is determined
by several factors. Some of those factors are the
same factors that determine the in-frame overhaul:
• An increase of oil consumption
• An increase of crankcase blowby
• A decrease and variation of cylinder compression
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Maintenance Section
Inlet Air System - Inspect
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