Modifying Swim Platform Exhaust Pipe, If Required; Silent Choice Exhaust System; Exhaust Bellows Removal And Exhaust Tube Installation - Mercury 305 CID Service Manual

Modifying Swim Platform Exhaust
Pipe, If Required
a
TRANSOM
a - Cut Line (See Notes)
NOTE: If riser kits are installed, or if more vertical
drop is required, cut "a" must be made, and the upper
and lower sections of the pipe rejoined with a 4 in.
(102 mm) I.D. exhaust hose of the required length.
Secure with hose clamps.
NOTE: Prime/paint any raw (cut) aluminum surface.
IMPORTANT: Each exhaust bellows must be
double clamped at each connection, and the
hose clamps tightened to 30-40 lb. in. (3-5 N·m).
Index
7D-4 - COLLECTORS
ENGINE
72743
Silent Choice Exhaust
System
If engine is equipped with thru-prop exhaust, a
thru-transom kit [4 in. (102 mm)], two exhaust bel-
lows, and eight bellows hose clamps, are required.
If engine is equipped with thru-transom exhaust, an
exhaust pipe kit (P/N 44266A6) is required, contain-
ing the exhaust pipe and necessary parts.
IMPORTANT: When installing Silent Choice ex-
haust, it is recommended that the exhaust bel-
lows 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.
! CAUTION
It is the responsibility of the boat manufacturer or
installing dealer to properly locate the engine
and install exhaust system. Improper installation
may allow water to enter the exhaust manifolds
and combustion chambers, and severely dam-
age the engine. Damage caused by water in the
engine will not be covered by MerCruiser Warran-
ty, unless this damage is the result of defective
part(s).
Exhaust Bellows Removal and
Exhaust Tube Installation
1. If required, remove and discard clamps and bel-
lows from gimbal housing.
b
a
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