B Class Atlantic 85 Manual – First Issue, June 2017
Activity 9 - Propulsion and Auxiliary Systems
Cooling system flow chart
Trim tab water inlet Cooling water inletPropeller boss
Engine cooling
Fuel cooling
Cooling water outlet
Fuel cooler
Thermostat
Cylinder block Cylinder head
Exhaust cover
Flushing device
PCV
Upper case (Muffler)
Lower case
Water pump
Water
Engine thermostat
The thermostat is sited on the top of the engine. It is a
wax-filled thermostat and is designed to open at 50°C
(122°F) and fully open at 60°C (140°F).
A faulty thermostat will result in either the engine
overheating as the thermostat remains closed or the
engine will not reach its correct operating temperature
and remain cold due to the thermostat being permanently
open.
Pressure control valve (PCV)
The pressure control valve is on the side of the
water jacket, just below the temperature sensor. Its
purpose is to relieve excess water pressure prior to the
thermostat opening.
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