
PRECAUTIONS
The Importance of Periodic
Maintenance
Engine deterioration and wear occur in
proportion to the length of time the engine
has been in service and the conditions the
engine is subjected to during operation.
Periodic maintenance prevents unexpected
downtime, reduces the number of accidents
due to poor engine performance and helps
extend the life of the engine.
Performing Periodic
Maintenance
WARNING! NEVER block windows,
vents or other means of ventilation if the
engine is operating in an enclosed area.
All internal combustion engines create
carbon monoxide gas during operation.
Accumulation of this gas within an
enclosure could cause illness or even
death. Make sure that all connections
are tightened to specifications after any
repair is made to the exhaust system.
Failure to comply could result in death
or serious injury.
The Importance of Daily Checks
The Periodic Maintenance Schedule
assumes that the daily checks are
performed on a regular basis. Make a habit
of performing daily checks before the start
of each operating day. See Daily Checks on
page 28.
Keep a Log of Engine Hours and
Daily Checks
Keep a log of the number of hours the engine
is operated each day and a log of the daily
checks performed. Also note the date, type
of repair (e.g., replaced alternator), and
parts used for any service needed between
the periodic maintenance intervals. Periodic
maintenance intervals are every 50, 150,
300 and 600 engine hours. Failure to
perform periodic maintenance will shorten
the life of the engine.
Yanmar Replacement Parts
Yanmar recommends that you use genuine
Yanmar parts when replacement parts are
needed. Genuine replacement parts help
ensure long engine life.
Tools Required
Before you start any periodic maintenance
procedure, make sure you have the tools
you need to perform all of the required tasks.
Ask Your Authorized Yanmar
Marine Dealer or Distributor For
Help
Our professional service technicians have
the expertise and skills to help you with any
maintenance or service-related procedures.
PERIODIC MAINTENANCE
GM Series Operation Manual 43
© 2007 Yanmar Marine International
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