Overhaul (In-Frame); Overhaul (Major) - Perkins 4016-61TRS1 Operation And Maintenance Manual

SEBU8430
Check the operation of the jacket water heater. For
an ambient temperature of 0 °C (32 °F), the heater
should maintain the jacket water coolant temperature
at approximately 40 °C (104 °F).

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
• A reduction in the detonation margin
•
An increase in throttle position
Each individual condition may not indicate a need for
an overhaul. However, evaluating these 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 these conditions. 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.
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
done for a top end overhaul. Additionally, some other
components that wear are replaced. The condition
of components is inspected. Those components are
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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 32000
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
•
A reduction in the detonation margin
•
An increase in throttle position
Other factors must also be considered for determining
a major overhaul:
•
The service hours of the engine
•
The wear metal analysis of the lube oil
•
An increase in the levels of noise and vibration
An increase of wear metals in the lube oil indicates
that the bearings and the surfaces that wear may
need to be serviced. An increase in the levels of
noise and vibration indicates that rotating parts
require service.
Note: It is possible for oil analysis to indicate a
decrease of wear metals in the lube oil. The cylinder
liners may be worn so that polishing of the bore
occurs. Also, the increased use of lube oil will dilute
the wear metals.
Monitor the engine as the engine accumulates
service hours. Consult your Perkins dealer about
scheduling a major overhaul.
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Maintenance Section
Overhaul (In-Frame)
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