Engines and Transmissions
11.7
11.4 Engine Exhaust
Engine exhaust must be properly routed and vented
externally. Please refer to the Waste Systems chapter in
this manual for your boat’s exhaust system layout. The
engine exhaust contains Carbon Monoxide (CO). Please
read and understand the Boating Safety Chapter of this
manual and know the dangers of CO and how to avoid
them. Carbon Monoxide will kill you, and in most situa-
tions, by the time you know something is wrong, it could
be too late. Be proactive and know what to look for and
what to do before a situation becomes critical.
Inspect your boat’s exhaust system frequently, or have
a qualified service technician service the system to
ensure that there are no leaks. Always verify the exhaust
clamps are tightened throughout the system. Keep
the necessary tools on hand to perform this action.
11.4.1 Hydrolock
Hydrolock is caused by water entering the engine cylin-
ders through the exhaust. The following conditions can
cause hydrolock.
Engine shutdown: A sudden engine shutdown while
the boat is moving may force water into the exhaust
system.
Anchored or adrift: When anchored from the stern,
pulling a sea anchor or adrift, rough seas may rock
your boat severe enough to cause water to splash
out of the mufflers into the engine while the engines
are shut down.
Improper hoisting: Operators are sometimes tempt-
ed to reduce hoisting time for propeller changes by
hoisting only the boat stern. Such hoisting can cause
residual water in the exhaust system to enter the
engine cylinders.
Engine start problems: Repeated attempts to start
the engine will cause water to collect but without
sufficient pressure to eject it. Refer to the Water
Systems chapter of this manual for water control
when starting.
Be aware of the potential of hydrolock and avoid these
conditions.
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Avoid the exhaust outlets, lines, hoses or equipment
when the engines have been run for a period of time.
These areas may be very hot! You can be seriously
burned by the exhaust system after the engines
have ran for a period of time. To avoid injury, allow
the exhaust system to cool before handling or mak-
ing adjustments to avoid injury.
11.5 Maintenance
As with automobile engines, your marine engine requires
specific maintenance within certain periods of time, such
as the engine break-in period. Again, become thoroughly
familiar with and perform these maintenance procedures
as scheduled and specified by the engine manufacturer
Such an approach will only positively affect your engine’s
life.
Should you have any questions regarding engine main-
tenance or operations not found in the OEM manuals,
please contact your boat dealer or Customer Service.
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