Draining The Cooling System; Raw Water Cooled Engines - Volvo 5.0OSiE-J Operator's Manual

Draining the Cooling System

NOTICE! When temperatures drop below freezing, failure to completely drain the cooling system will result in se-
rious damage to the engine and exhaust manifolds. To assure complete drainage, probe all drain open-
ings with a piece of wire to remove any blockage.
NOTICE! The following steps are very important in protecting your engine from damage in freezing conditions. If
unsure of how to perform any of the following steps, see your Volvo Penta dealer for a complete end-of-
season/winterization service. Freeze damage to the engine package is not covered by your Volvo Penta
limited warranty.
NOTICE! When draining the starboard manifold, take care to direct the drained water away from the starter to
prevent water damage to the starter.
VPA 7748131 English 09-2007
22800
22848-a
•
Perform these procedures with the boat out of
the water. It will prevent damage to cooling sys-
tem components if temperatures drop below
freezing.
•
When draining the engine, raise or lower the
bow of the boat to keep the engine level. This
will provide for complete drainage of the block
and manifold. If the bow of the boat is higher or
lower than the stern, some water may be
trapped in the block.

Raw Water Cooled Engines

1. With the engine turned off, locate and open the
engine drain petcocks (B) located on both sides
of the engine block.
NOTICE! Be sure that all water is drained from the
engine. If no water drains when the pet-
cocks are opened, remove the petcocks
and use a piece of wire to clear any obstruc-
tions from the drain hole. Failure to drain all
the water from the engine may result in en-
gine damage during freezing temperatures.
2. Remove drain plugs from exhaust manifolds (A).
Raise or lower the bow of the boat to ensure com-
plete drainage. Probe the drains with a wire to
ensure rust particles have not blocked the drain.
After the water has completely drained, reinstall
the drain plugs and tighten securely.
3. Note the hose orientation on the raw water pump.
Loosen the hose clamps and remove the hoses
from the raw water pump. Loosen the hose clamp
on the large diameter hose and remove it from
the circulation pump.
Maintenance
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