Mercury MerCruiser Service Manual page 459

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)
90-8M0099748 eng DECEMBER 2015
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.
© 2016 Mercury Marine
Water Flow Diagrams
Page 6D-11