54
Cooling system
Volvo Penta engines have a thermostat-controlled, raw wa-
ter, or closed cooling system.
1. Water is drawn through water intakes located on the lead-
ing edge of the sterndrive by a raw water pump mounted
on the crankshaft of the engine.
2. Water is pumped to the engine thermostat housing where
it is routed to the circulating water pump through the cool-
ing system. In a closed cooling system it is routed through
the heat exchanger in a raw water system it is circulated
through the engine via the circulating water pump.
3. A thermostat inside the engine determines the amount of
water to be taken in, recirculated, and discharged to con-
trol the engine’s operating temperatures.
Engine overheating
If your engine overheats, the audible alarm will sound and a
temperature gauge on your instrument panel will indicate
your engine is overheating.
1. Turn off the engine.
2. Tilt the drive up and look for obstructions to the water
intakes (e.g., seaweed, plastic bags).
3. Lower the drive unit.
4. Turn on the engine and run it in
NEUTRAL at 1500 RPM.
5. Check the engine gauge to verify condition.
6. If overheating still occurs, return to shore at low RPM (to
prevent excessive overheating and engine damage).
7. See your Volvo Penta dealer for service assistance.
If the engine overheats at high engine speeds, the engine
protection mode feature will activate and an alarm may sound:
•
Engine speed will automatically be gradually re-
duced to a maximum of 2500 RPM.
•
The engine will operate normally only below 2500
RPM.
•
The engine protection mode feature will remain ac-
tivated until the engine overheating problem is cor-
rected.
Caution!
Do not remove the thermostat from the engine, as the
engine is likely to overheat.
Summary of Contents for 4.3OSi-C
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