Mercury MerCruiser Service Manual page 457

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
90-8M0099748 eng DECEMBER 2015
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.
© 2016 Mercury Marine
Water Flow Diagrams
Page 6D-9