Exhaust System; Important Information; Carbon Monoxide Poisoning - Mercury MerCruiser Product Applications Manual

Exhaust System

Exhaust System

Important Information

It is the responsibility of the boat manufacturer or installing dealer to properly locate the
engine and install the exhaust system. Exhaust systems that are installed improperly will
allow water to enter the exhaust manifolds and combustion chambers severely damaging
the engine. Water Ingestion Damage to the engine will not be covered by Mercury
MerCruiser Warranty unless the damage results from defective Mercury Marine parts.
The exhaust system must be installed in accordance with the specifications contained in
this section. Special care must be taken as the custom designed exhaust systems used
can create a tuning effect that can cause water to be forced back into the engine. The
instructions in Checking for Water Intrusion must be performed to ensure that water
intrusion is not occurring. It is the boat manufacturer's responsibility for ensuring that water
intrusion does not exist with their unique exhaust system.
Applicable boating industry standards and regulations (NMMA, ABYC, SAE, USGC, EUs,
RCD, ISO) for the markets where the boat will be sold must be adhered to when designing
and installing exhaust system.
Exhaust system design and installation can affect:
• Noise level.
• Performance.
• Water Intrusion.
• Carbon monoxide levels.
• Component longevity.
GLOSSARY
Water lift muffler— A muffler that exhausts above the inlet in order to muffle by lifting a
column of water.
Inline muffler—A muffler that has an outlet that is parallel and level with the inlet.
Collector—A collection device that joins two exhaust banks into a perpendicular chamber
without providing any noise reduction.

Carbon Monoxide Poisoning

IMPORTANT: The following important information is covered in the owner's operation,
maintenance and warranty manuals. You may also want to include this information in the
boat owner's manual.
Carbon monoxide is present in the exhaust fumes of all internal combustion engines
including the outboards, sterndrives, and inboard engines that propel boats, as well as the
generators that power various boat accessories. Carbon monoxide is a deadly gas that is
odorless, colorless, and tasteless.
Early symptoms of carbon monoxide poisoning, which should not be confused with
seasickness or intoxication, include headache, dizziness, drowsiness, and nausea.
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CAUTION
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WARNING
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90-863758060 AUGUST 2006