7742836 07-2003
55
Maintenance
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2
3
Closed Cooling System
Check the coolant level and antifreeze concentration
(check antifreeze manufacturer’s instructions). Make sure
the freeze point is adequate for expected temperatures.
To drain the raw water system of your engine with factory
installed closed cooling on your Volvo Penta engine.
Note!
The boat should be out of the water and the bow
down slightly to allow complete drainage.
1. Using a 9/16 inch wrench, loosen but do not remove the
cover bolt (1) on the bottom of the heat exchanger ap-
proximately three revolutions.
2. Twist the heat exchanger cover and gasket (2) in either
direction and allow the water to completely drain from
the system.
3. After the heat exchanger is drained, retighten the cover
bolt to 27 N•m (20 lb. ft.)
4. Loosen the hose clamp (3) on the raw water inlet hose
and remove the hose from the raw water pump.
5. Allow all the water to drain and reinstall the hose and
tighten the hose clamp.
Caution!
Ensure there is sufficient antifreeze in the closed side
of the cooling system to protect the engine for the an-
ticipated temperatures. Follow the antifreeze
manufacturer’s instructions for proper water/antifreeze
ratios.
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