a - Heat exchanger with attached thermostat housing
b - Crossover
c - Water circulating pump
d - To engine block—from water circulating pump
e - To crossover (from engine block)
f - Exhaust manifold coolant inlet
g - Exhaust manifold coolant outlet
h - Detail of rear of heat exchanger, showing thermostat
(shaded)
NOTE: Seawater hoses are not shown, for clarity.
NOTE: Inboard V‑Drive is the same as TowSport V‑Drive
except on seawater side. No inlet hose to the sea pump
on Inboard V‑Drive and transmission cooler oil lines are
different.
Water Flow Diagrams
90-8M0099748 eng DECEMBER 2015 © 2016 Mercury Marine Page 6D-9
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