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72
Maintenance Section
Inlet Air System - Inspect
2. Operate the engine and check the timing marks on
the flywheel.
3. If necessary, adjust the ignition timing. Remove the
cap (not shown) that covers the screw for timing
adjustment (1). By using a suitable tool, rotate the
screw (1) in order to adjust the ignition timing.
4. Install the cap when the ignition timing is correct.
Remove the timing light.
• Rotating the screw (1) clockwise retards the
ignition timing.
• Rotating the screw (1) counterclockwise advances
the ignition timing.
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
turbochargers
• Turbochargers
• Piping between the turbochargers and the
aftercoolers
• Aftercoolers
• Piping between the air/fuel ratio and the gas mixer
units
• Piping between the closed circuit breather and the
turbochargers
• Connection of the aftercooler to the air inlet
manifolds
• Connection of the air inlet manifolds to the cylinder
heads
Ensure that all of the connections are secure. Ensure
that the components are in good condition.
Jacket Water Heater - Check
Jacket water heaters help to improve startability in
ambient temperatures that are below 10 °C (50 °F).
All installations that require automatic starting should
have jacket water heaters.
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)
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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.
SEBU8430-02
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