GENERAL SERVICE MANUAL NUMBER 23
Page 7A-4 90-861326--1 MARCH 1999
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.
22116
a
b
a-Exhaust Bellows
b-Clamps
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:
• MCM 7.4L MPI
• MCM 454 / 502 Mag MPI
• 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.
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