Mercury 8.1S Horizon, Product Applications Manual

Page: 79 / 163

Exhaust System
Page 6A-10 90-863758060 AUGUST 2006
• Every exhaust hose connection must be secured with at least two hose clamps. The
clamps should be stainless steel and at least 13 mm (½ in.) wide. Clamps that rely
solely on spring tension should not be used. (ABYC Standard)
• The system must have the capability to be serviced, reassembled and replaced while
maintaining all of the specifications. The boat builder must provide documentation such
as manuals, drawings, or orientation marks on production assemblies.
• It is strongly recommended that orientation marks be used on all production exhaust
system assemblies.
• In‑line mufflers, collectors, and hoses must self drain after engine shutdown.
T Junction With In‑Line Muffler
a
b
c
d
e f
g
h
i
k
j
g
l
15633
Typical
a - Water line
b - Minimum exhaust elbow height
with maximum load
c - Exhaust back pressure check
point
d - Resonator
e - 46 cm (18 in.) minimum between
exhaust elbow and collector
f - 10° downward slope minimum
g - 3° downward slope minimum
h - 30°–60° degree angle at T‑junction
i - 3° downward slope minimum
j - Muffler
k - External flappers
l - Drain fitting