Cooling Fresh Water; Handling Of Coolant - Yanmar 3YM20 Operation Manual

3. OPERATION

3.1.3 Cooling fresh water

Use clean soft water and always be sure to
add LLC (Long Life Coolant) in order to
prevent rust built up and freezing. (Do not
use water only.)
The recommended LLC conform to the fol-
lowing specifications.
• JIS K-2234
• SAE J814C, J1941, J1034, J2036
• ASTM D3306
• ASTM D4985
Consult your Yanmar dealer or distributor on
the use of coolant/antifreeze, and detergents.
Examples of LLC which provide good perfor-
mance are:
• TEXACO LONG LIFE COOL-
ANT ANTIFREEZE, both stan-
EN
dard and pre-mixed.
Product code 79947 and 7998.
• HAVOLINE EXTENDED LIFE
ANTIFREEZE/COOLANT.
Product code 7994
NOTICE
• Always be sure to add LLC to soft wa-
ter. In particular, in cold season, to add
LLC is important.
Without LLC,
Cooling performance will decrease due
to scale and rust in the cooling water
system.
This causes serious damage in the
cooling system.
• Be sure to use the proper amount of
coolant concentrate specified by the
LLC manufacturer depending on the
24
ambient temperature. LLC concentra-
tion should be 30% as a minimum and
60% as a maximum.
• DO NOT mix the different types of
brand of LLC, otherwise harmful
sludge may yield.
• DO NOT use hard water.
• Water should be free from sludge and/
or particles.
CAUTION
When handling LLC, use protective
gloves to avoid skin contact.
In case it comes in contact with your
skin or eyes, wash it out with clean wa-
ter.

3.1.3.1 Handling of Coolant

(1) Choose LLC, which will not have
any adverse effects on the materi-
als (cast iron, aluminium, copper,
etc.) of the engine's fresh water
cooling system.
(2) Replace the cooling water periodi-
cally, according to the maintenance
schedule given in this operation
manual.
(3) Remove the scale from the cooling
water system periodically, accord-
ing to the instructions in this oper-
ation manual.
NOTICE
Excessive use of LLC also lowers the
cooling efficiency of the engine. Be
sure to use the mixing ratios specified
by the antifreeze maker for your tem-
perature range.