Check the operation of the jacket water heater.
Check the operation of the circulation pump, if
equipped. For ambient temperatures of 10 °C (50 °F)
and below, maintain the heater should maintain the
jacket water heater temperature at approximately
60 °C (140 °F).
i09908983
Overhaul (Major)
Scheduling a Major Overhaul
The need for a major overhaul is determined by
several factors:
• An increase of oil consumption
• An increase of crankcase blowby
• A decrease and variation of cylinder compression
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 can 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 Perkins Engines Stafford
about scheduling a major overhaul.
Perkins recommends that in standby applications, at
a period of 5 years, the following components should
be removed from the engine:
• Piston assembly
• Piston rings
• Cylinder liner
• Connecting rod bearings
Note: One cylinder from “A Bank” should be selected
to have the components removed. Another cylinder
from “B Bank” should be selected to have the
components removed.
Contact your Perkins distributor for more information.
An inspection of the components by the Perkins
distributor can help to determine when a major
overhaul is required as well as the other factors.
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
During a major overhaul, all the bearings, seals,
joints, and components that wear should be
disassembled. The parts should be cleaned and
should then be inspected. If necessary, the parts
should be replaced. The crankshaft should be
inspected and measured for wear. The crankshaft
may require regrinding. Alternatively, the crankshaft
may be replaced.
Inspecting Components
Inspect the following components during a major
overhaul.
• Radiator and system
• Camshaft
• Camshaft followers
• Connecting rods and bearings
• Crankshaft and bearings
• Gear train
• Inlet air piping
• Oil cooler
• Pistons and rings
• Cylinder liners
• Cylinder heads
• Inlet and exhaust valves
Replace the crankshaft vibration dampers.
i09811855
Overhaul (Top End)
Scheduling a Top End Overhaul
Top end overhauls should be scheduled according to
the recession of the valve stems. This measurement
provides an accurate indication of the rate of valve
wear. This measurement can be used to predict
when a cylinder head requires replacement.
94 M0163009
Maintenance Section
Overhaul (Major)
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