Cooling System - Yamaha F150A Service Manual

Cooling system

The cooling water flow diagram is as follows.
To cool the propeller damper, the cooling system is designed so that fresh cooling water is taken in
from the front of the trim tab and supplied to the exhaust passage of the lower case to cool the
exhaust gas.
Cooling water also accumulates around the exhaust muffler to cool the upper case and reduce
exhaust noise.
Pressure control valve
Upper case
Lower case
Propeller boss
1 Exhaust manifold
2 Muffler
3 Exhaust gas
63P3F11
Thermostat
Cylinder block
Cylinder head
Cylinder block
Exhaust cover
Exhaust guide
Oil pan
Water pump
Trim tab
Water inlet
Sea / River / Lake
1
2
È
:
4 Water
È Water
Features and benefits
Fuel cooler
Cooling water pilot hole
3
4
S63P1170
1-12
1
2
3
4
5
6
7
8
9