Mercury MerCruiser Service Manual page 496

Exhaust Pipe and Through-the-Propeller Exhaust
2. Ensure that the horizontal support bar is perpendicular to the vertical axis of the exhaust tube, and that the rubber shutter
rests on the bottom of the steel grate in the closed position, as indicated by decal on the shutter. The shutter must be able
to gravitationally seal in order for it to be effective.
Improper boat design and construction may result in serious injury or death. Adhere to all applicable marine regulations
(United States Coast Guard [USCG], European Union–Recreational Craft Directive [EU‑RCD], etc.) and the standards they
reference (American Boat and Yacht Council [ABYC], Society of Automotive Engineers [SAE], International Standards
Organization [ISO], etc.) when designing and constructing the boat and other components, such as the engine compartment,
fuel delivery system, or exhaust system.
Hot spots in exhaust hoses can damage hoses and cause leaks. Ensure that discharge water from the exhaust elbow flows
without restriction through all hoses and fittings.
IMPORTANT: All exhaust connections, including those at the exhaust elbow, must be secured with two hose clamps.
ABYC standards also specify the use of stainless steel clamps with a minimum 13 mm (½ in.) bandwidth. Do not use
spring tension clamps.
3. Every exhaust hose connection must be secured with at least two stainless steel hose clamps.
Page 7C-6
52800
a
Decal indicating position and flow
WARNING
!
NOTICE
© 2016 Mercury Marine
Shutter assembly outlet end
a - Bottom of steel grate
59034
90-8M0099748 eng DECEMBER 2015