250 HP JET DRIVE INSTALLATION MANUAL
Page 41
90-10240040 DECEMBER 2003
Top View
a
b
c
d
a-250 hp – 878147-A1 Muffler Assembly, Port [22.8 cm (9.0 in.)] with
7.6 cm (3.0 in.) Outlet
b-Connection Piping between Expansion Chamber and Muffler must be made of
7.6 cm (3.0 in.) O.D. Tubing. Tubing must be either 5052 or 6061 (14 ga) alumi-
num or type 304 (14 ga) stainless steel to protect against corrosion.
c-57885-A1 Flange Assembly (2 required) or equivalent through transom fittings
may extend 12.7 cm (5 in.) below water line for quiet idle operation. Exhausting
under a swim platform or other horizontal surface may cause transmission of
noise and vibration to the boat during operation.
d-250 hp – 878148-A1 Muffler Assembly, Starboard [22.8 cm (9.0 in.)] with
7.6 cm (3.0 in.) Outlet.
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