Cooling System; Raw Water System; Closed Cooling System (F-Series); Engine Overheating (Gi & Gxi Only) - Volvo Penta 3.0GLP-C Owner's Manual

Maintenance
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Cooling System

Raw Water System

Various Volvo Penta engines have a thermostat-con-
trolled cooling system.
1. Cool water is drawn in through raw water intake
(A) by an impeller (C) connected to the raw water
pump (D) mounted on the front of the engine.
2. Water is pumped to the engine and routed by cir-
culating water through the cooling system (B).
3. A thermostat inside the engine determines the
amount of water to be taken in, recirculated, and
discharged to control the engine's operating tem-
peratures.

Closed Cooling System (F-Series)

Various Volvo Penta engines have a thermostat-con-
trolled, recirculating type cooling system.
1. Cool water is drawn in through raw water intake
(E) by an impeller (F) connected to the raw water
pump (G) mounted on the front of the engine.
2. Water is pumped (H) to the heat exchanger (I),
which cools the engine cooling fluid (J). The raw
water is then routed to the exhaust manifolds
where it is mixed with exhaust and dumped over-
board through the sterndrive exhaust port.
3. The engine cooling fluid is recirculated between
the engine and the heat exchanger by the engine
circulation pump (K).
4. A thermostat inside the engine determines the
amount of water to be taken in, recirculated, and
discharged to control the engine's operating tem-
peratures.
Engine Overheating (Gi & GXi only)
If the engine overheats at high engine speeds, the en-
gine protection mode feature will activate and:
•
Engine speed will be automatically reduced to
approximately 2500 RPM. The engine will not
operate above 2500 RPM. If an engine overheat
alarm has been installed, an audible warning
horn will sound.
•
The engine protection mode feature will remain
active until the engine has been reduced to
below 1200 RPM and the overheating problem
is corrected. For additional information, see
Engine Protection Mode on page 24.
CAUTION! Do not remove the thermostat
from the engine as the engine is likely to over-
heat.
VPA 7743722 English 10-2004