TPD1327E Chapter 4
Page 21
How to drain the raw water circuit
Caution: The raw water system cannot be drained
completely. If the system is drained for engine
preservation purposes or for protection from frost,
the system must be lled again with an approved
antifreeze mixture. See “Coolant specication”
in section 5 for details of the correct coolant to
be used. See section 7 for details of how to add
antifreeze to the raw water system for engine
preservation purposes.
Engines tted with heat exchangers
1. Ensure that the seacock is closed.
2. Disconnect both hoses (A1) at the raw water
pump.
3. For four cylinder engines: Remove the hose (B1)
from the heat exchanger.
4. Rotate the crankshaft to ensure that the raw
water pump is empty.
5. Fit the hose to the heat exchanger.
For six cylinder engines: Remove the drain plug
(C1) from the front cover of the heat exchanger for
the coolant system. Ensure that the drain hole is not
restricted.
Rotate the crankshaft to ensure that the raw water
pump is empty.
Fit the drain plug to the heat exchanger.
5. Connect the hoses at the raw water pump and
tighten the clips.
Caution: When the raw water system is to be used
again, ensure that the seacock is open.
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