1. General
13
1.3.3 Coolant
(1) Choose antifreeze, which will not have
any adverse effects on the materials
(cast iron, aluminum, copper, etc.) of the
engine's fresh water cooling system.
(2) Use the proper mixing ratio of antifreeze
to fresh water strictly as instructed by
the antifreeze maker depending on the
ambient temperature. LLC concentration
should be 30% as a minimum and 50%
as a maximum.
(3) Replace the coolant periodically,
according to the maintenance schedule
given in the operation manual.
(4) Remove the scale from the cooling
water system periodically, according to
the instructions in the operation manual.
(5) Use the proper mixing ratio of antifreeze
to fresh water strictly, as instructed by
the antifreeze maker. If too much
antifreeze is used, the cooling
performance of the coolant will drop and
the engine may become overheated.
(6) Do not mix different brands of
antifreeze.
Chemical reactions may make the
antifreeze useless and engine trouble
could result.
Excessive use of antifreeze also lowers the cooling
efficiency of the engine. Be sure to use the mixing
ratios specified by the antifreeze maker for
temperature range.
Consult your Yanmar dealer or distributor on the
use of coolant/antifreeze, and detergents.
Coolant/antifreeze, which provides good perfor-
mance for example, are shown below.
• TEXACO LONG LIFE COOLANT ANTI-
FREEZE, both standard and pre-mixed.
Product code 7997 and 7998.
• HAVOLINE EXTENDED LIFE ANTIFREEZE/
COOLANT.
Product code 7994
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