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Chapter 7 MAINTENANCE SCHEDULE
How to Use the Maintenance Schedule
Periodic inspection not only extends the service life of the engine but also serves to ensure safe operation. Be sure
to conduct inspections and maintenance according to the maintenance schedule.
The maintenance schedule shows the standard service intervals. If you notice any abnormalities such as abnormal
noise, black exhaust smoke, white exhaust smoke, extremely high temperature of exhaust gas, abnormal vibration,
and fuel, oil or exhaust gas leakage, make sure to conduct the inspection and maintenance work, regardless of rec-
ommended service intervals in the "Maintenance schedule."
Note: Appropriate service intervals vary depending on the usage and operating conditions as well as consumption
of fuel, oil and coolant. Check the operating record of the engine to determine the most appropriate service
intervals. (Feel free to consult a dealer of Mitsubishi Heavy Industries, Ltd. regarding service intervals.)
Service the items at multiples of the original requirement. For example, at 1000 service hours, also service those
items listed under every 250 service hours and every 50 service hours.
Periodic Maintenance Chart
Appropriate service intervals vary depending on the engine specifications. Perform all daily inspection and mainte-
nance items in an accordance with the following 3 categories.
Periodic Maintenance Chart for Regular Use Engine
When the engine is used as a regular use engine, perform the periodic inspection and maintenance in accordance
with the "Periodic Maintenance Chart for Engine in Regular Use".
Periodic Maintenance Chart for Emergency Engine
When the engine is used as an emergency engine, perform the periodic inspection and maintenance in accordance
with the "Periodic Maintenance Chart for Emergency Engine". Due to the nature of application, an engine for emer-
gency use is subject to demanding operating conditions such as a quick startup and immediate supply of power. In
addition, it must operate reliably in the event of an emergency. Therefore, be sure to perform the daily inspection
and also conduct the following operation for maintenance purposes. Once every week: Operate the engine under
no load (for 3 to 5 minutes). (When operating the engine for the adjustment of peripheral devices, limit the operating
time to 10 minutes.) Once every month: Operate the engine under load (for 15 to 30 minutes with more than 1/2
load). If the engine cannot be operated under load every month, operate the engine under load (more than 1/2 load)
for more than 2 hours. During the engine maintenance operation, check the ease of startup, oil pressure, and
exhaust color and vibration.
Periodic maintenance chart for general purpose engine
If the engine is used for different purposes other than the above usage, do maintenance according to the "Periodic
Maintenance Chart for General-Purpose Power Supply Engine".
