MerCruiser 305 CID (5.0L) Service Manual page 799

COLLECTORS
Exhaust Muffler Kit
This muffler, designed for use on all V-8 engines with Plus Power exhaust systems (4 in.,
7 degrees downward outlets), requires the installation of 1-1/4 in. (32 mm) exhaust elbow
risers, which are included in the kit.
IMPORTANT: If a thru-transom exhaust kit other than the one from Mercury Marine
is used, the exhaust kit must be equipped with internal shutters and external flap-
pers.
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 damage
the engine. Damage caused by water in the engine will not be covered by Mercury
MerCruiser Warranty, unless this damage is the result of defective part(s).
IMPORTANT: Restrictor gaskets (if equipped) must be installed in order shown.
1-1/4 Inch Muffler Riser Installation
NOTE: Later models will have an open gasket (four slots) instead of a restrictor gasket (two
slots and two holes). If replacing gaskets, it is acceptable to replace the old gaskets with the
open gaskets. Be sure that the same type of gasket is used on both manifolds.
Index
Page 7C-12
a - Exhaust Manifold
b - Exhaust Elbow
c - Bolt (4 Each Manifold)
d - Gasket - Lightly Coat Both Sides With Quicksilver Perfect Seal
e - Riser 1-1/4 Inch (32 mm) Height
f - Restrictor Gasket (Open Gasket on Later Models)
g - Refer To Note Following
CAUTION
c
b
f
e
d
a
SERVICE MANUAL NUMBER 23
g
72780
90-861327--1 OCTOBER 1999