Cast Iron Elbows With 6 Inch Riser And Mufflers - Mercury MerCruiser MCM 454 Mag MPI Service Manual

RISERS

Cast Iron Elbows With 6 Inch Riser and Mufflers

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-8
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l
a - Exhaust Elbow 4 In. (101 mm)
b - Muffler Spacer 1-1/4 In. (32 mm)
c - Exhaust Riser 6 In. (152 mm)
d - Open Gasket (4 Slots)
e - Hex Head Screw (4) 1 In. (25 mm)
f - Bolt (8) 7 In. (178 mm) or
Bolt (2) 8 In. (203 mm) (Used Only at Remote Oil Filter Bracket if So Equipped)
g - Exhaust Manifold
h - Drop-Down Bracket (1)
i - Restrictor Gasket
j - Washers (6)
k - Screws (6) 1/2 In. (12 mm)
l - Refer To Note Following
f
a
h
i
k
j
b
d
e
c
d
g
SERVICE MANUAL NUMBER 23
70481
90-861326--1 MARCH 1999