
SAFETY
BY Series Operation Manual 19
CAUTION
Observe the following
environmental operating
conditions to maintain engine
performance and avoid
premature engine wear:
• NEVER run the engine if the
ambient temperature is above
+40°C (+104°F) or below -16°C
(+5°F)
◆ If the ambient temperature
exceeds +40°C (+104°F) the
engine may overheat and
cause the engine oil to break
down.
◆ If the ambient temperature
falls below -16°C (+5°F)
rubber components such as
gaskets and seals will
harden causing premature
engine wear and damage.
◆ See your authorized Yanmar
marine engine dealer or
distributor if the engine will
be operated in either
temperature extreme.
• See your authorized Yanmar
marine dealer or distributor if
you need to operate the engine
at high altitudes. At high
altitudes the engine will lose
power, run rough, and produce
exhaust gases that exceed the
design specifications.
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CAUTION
Observe the following
environmental operating
conditions to maintain engine
performance and avoid
premature engine wear:
• Avoid operating in extremely
dusty conditions.
• Avoid operating in the
presence of chemical gases or
fumes.
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CAUTION
• Only use the engine coolant
specified. Other engine
coolants may affect warranty
coverage, cause an internal
buildup of rust and scale
and / or shorten engine life.
• Prevent dirt and debris from
contaminating engine coolant.
Carefully clean the heat
exchanger cap and the
surrounding area before you
remove the cap.
• NEVER mix different types of
engine coolants. This may
adversely affect the properties
of the engine coolant.
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