Exhaust System Notice
NOTICE
Improperly designing, installing, or modifying the engine’s exhaust system can introduce seawater or water from
condensation into the combustion chambers, damaging the engine. The installing dealer or boatbuilder is responsible for
proper installation of the exhaust system as explained in the installation instructions for the product. Engine damage resulting
from water ingestion is not covered by the product warranty, unless the damage is the result of a defective part supplied by
the engine manufacturer.
IMPORTANT: Through‑the‑hull exhaust is not allowed on 6.2L engines, through the propeller only.
Exhaust System Connections
IMPORTANT: The exhaust system supplied by Mercury MerCruiser is compliant with the ABYC Standard P‑1. If components
are used in any portion of the exhaust system that modify the design of the supplied system, it is the boatbuilder's responsibility
to ensure that the new system complies with the ABYC Standards. Exhaust system connections to components other than
those supplied by Mercury MerCruiser must use two stainless steel clamps with a minimum width of 13 mm (1/2 in.) at each
joint.
Preventing Contamination of the Emissions Control System
Catalyst and oxygen sensors can become contaminated, leading to component failure.
Phosphorus, found in some marine‑grade oils, and other compounds will damage or destroy a catalyst's ability to clean the
exhaust. Catalyst‑friendly oil, such as Mercury MerCruiser Synthetic Blend Engine Oil, prevents this damage. Approved
synthetic oils must be used in MerCruiser engines with Emissions Control Technology (ECT), except in special circumstances.
Refer to Section 1A ‑ Engine Oil for additional information.
NOTICE
Acetoxy silicone sealants and other compounds can damage oxygen sensors and catalysts. Use only compounds and
sealants approved by Mercury Marine for use on catalyzed engines, such as Loctite 587 High Performance Blue.
Fiberglass is a silica‑based material that can contaminate the catalyst and the oxygen sensors. To reduce the possibility that
the engine will ingest harmful fiberglass and poison the emission control components, protect the engine from fiberglass dust
and debris during construction and clean‑up.
Fuel system and engine cleaners in the form of an aerosol sprayed near or into the intake of an operating engine can
contaminate the catalyst and the oxygen sensors. The use of spray cleaners could cause irreversible damage to the catalytic
converter leading to component failure.
NOTICE
Aerosol fuel system and engine cleaners sprayed near or into the intake of an operating engine can damage the catalyst and
the oxygen sensors. Do not spray aerosol cleaners near or into the intake of an operating engine. Use only approved fuel
system additives.
The recommended method for fuel system and engine cleaning on an operational engine equipped with ECT is to use
approved cleaners added to the fuel system. The cleaners approved by Mercury MerCruiser include Quickare, Quickleen, and
Quickstor. Refer to the manufacturer's instructions for proper use.
Determining Catalyst Health
Catalyst health can be determined by observing onboard diagnostics ‑ marine (OBD‑M) catalyst monitor ratios with CDS G3.
Remove the catalyst from the exhaust manifold for inspection only if live data indicates that a catalyst may be compromised.
Important Information
Page 7A-2 © 2016 Mercury Marine 90-8M0099748 eng DECEMBER 2015
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