Exhaust Tube Requirements - Mercury MerCruiser MCM 454 Mag MPI Service Manual

GENERAL

Exhaust Tube Requirements

IMPORTANT: When installing thru-transom exhaust, it is recommended that the
exhaust bellows on the transom assembly be removed. This is necessary to avoid
creating a vacuum at the exhaust outlet in the propeller at higher boat speeds. This
vacuum could degrade propeller performance on some boats.
1. If required, remove and discard clamps and bellows from gimbal housing.
IMPORTANT: When installing thru-propeller exhaust:
With any application, installation of an exhaust tube will increase exhaust noise.
With Bravo One and Bravo Two Drives an exhaust tube MAY BE INSTALLED for a
slight increase in performance.
With a Silent Choice Exhaust System the exhaust bellows must be removed and
an exhaust tube MUST BE INSTALLED.
With most Bravo Three Drive Models an exhaust tube MAY BE INSTALLED for a
slight increase in performance. On the following Bravo Three Models, the exhaust
bellows must be removed and an exhaust tube MUST BE INSTALLED:
With a Silent Choice Exhaust System the exhaust bellows must be removed and
an exhaust tube MUST BE INSTALLED.
With any application, installation of an exhaust tube will increase exhaust noise.
Index
Page 7A-4
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a - Exhaust Bellows
b - Clamps
MCM 7.4L MPI
MCM 454 / 502 Mag MPI
SERVICE MANUAL NUMBER 23
b
a
90-861326--1 MARCH 1999
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