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SEBU8430-02
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
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
• 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: Oil analysis may 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.
Note: The driven equipment may also require service
when the engine is overhauled. Refer to the literature
that is provided by the OEM of the driven equipment.
Major Overhaul Information
A major overhaul includes all the work that is done for
top end overhauls and in-frame overhauls.
Sometimes, the engine is relocated for disassembly.
Components that wear are disassembled and
inspected. If necessary, the parts are replaced. The
crankshaft is measured for wear. The crankshaft may
require regrinding. Alternatively, the crankshaft may
be replaced with a Perkins replacement part. Your
Perkins dealer can provide these services and
components. Your Perkins dealer can ensure that the
i06733467
components are operating within the appropriate
specifications.
If you elect to perform an overhaul without the
services of a Perkins dealer, be aware of the
following recommendations.
Replacing of Components
Replace the following components during the major
overhaul.
• Connecting rod bearings
• Cylinder liners
• Piston rings
• Turbochargers
• Cylinder heads
• Oil pump
• Joints and bolts
• Gaskets and seals
• Main bearings
• Water temperature regulators
Rebuilding or Replacing of Components
Rebuild the following components during the major
overhaul.
• Carburetor
• Engine Water pumps
Inspecting Components
Inspect the following components:
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Maintenance Section
Overhaul (Major)
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