Filling Heat Exchanger With Engine Coolant - Yanmar 6LY3-STC Operation Manual

BEFORE YOU OPERATE
Filling Heat Exchanger with
Engine Coolant
This procedure is for filling the heat
exchanger for the first time or refilling it after
it is flushed. Note that a typical heat
exchanger is shown (Figure 5).
1. Close the four water drain cocks / plugs
(two for engine coolant and two for
seawater).
Note: The drain cocks are opened before
shipping from the production plant.
1
Figure 5
1 – Freshwater Drain Cock
2 – Seawater Drain Cock
1
Figure 6
1 – Fresh Water Pump
2 – Coolant Tank (Heat Exchanger)
3 – Seawater Drain Cock
4 – Freshwater Drain Cock
5 – Seawater Pump
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© 2008 Yanmar Marine International
2. Remove the fill cap (Figure 7, (1)) on the
heat exchanger (Figure 7, (3)) by
turning the cap counterclockwise 1/3 of
a turn.
WARNING! NEVER remove the
coolant filler cap if the engine is hot.
Steam and hot engine coolant will
spray out and seriously burn you.
Allow the engine to cool down before
you attempt to remove the cap.
1
2
Figure 7
3. NOTICE: NEVER pour cold coolant into
a hot
engine. Pour coolant mix slowly into the
heat exchanger (Figure 7, (3)) so that
air bubbles do not develop.
Pour until the coolant overflows from the
filler port.
4. After filling the heat exchanger, replace
fill cap and tighten it firmly
(Figure 7, (1)). Failure to do so will
cause coolant leakage. To replace the
cap, align the tabs (Figure 7, (2)) on the
bottom of the cap with the notches on the
filler port and turn clockwise 1/3 of a
turn.WARNING! ALWAYS tighten the
coolant tank cap securely after
checking the coolant tank. Steam can
spray out during engine operation if
the cap is loose.
6LY3 LDC Operation Manual
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