Yanmar 4LHA-STZP Specifications download pdf (Page 27)

(1) Handling of Cooling Water

1) Always use purified soft water or distilled water for the fresh water. Never use dirty water or

hard water.

Impurities in the fresh water cause scale and rust to build up on the cooling water passage,

reducing cooling efficiency and causing the engine to overheat.

2) Choose LLC which will not have any adverse effects on the materials (cast iron, aluminum,

copper, etc.) of the engine's fresh water cooling system.

Consult your Yanmar dealer or distributor on the use of coolant /antifreeze, and detergents.

The coolans/antifreezes, which are good performance for example, are shown below.

●

TEXACO LONG LIFE COOLANT ANTIFREEZE, both standard and pre-mixed.

Product codes 7997 and 7998.

●

HAVOLINE EXTENDED LIFE ANTIFREEZE/COOLANT.

Product code 7994.

3) Strictly use the proper mixing ratio of LLC to fresh water as instructed by the LLC maker. If

incorrect ratio of LLC to fresh water is used, the cooling performance of the cooling water

will drop and the engine may become overheated.

4) Do not mix different types (brand) of LLC, chemical reactions may make the LLC useless and

engine trouble could result.

5) Replace the cooling water periodically according to the maintenance schedule given in this

operation manual.

6) Remove the scale from the cooling water system periodically according to the instructions this

operation manual.

Excessive use of LLC also lowers the cooling efficiency of the engine.

Be sure to use the mixing ratios specified by the LLC maker for your temperature

range.

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Yanmar 4LHA-STZP Specifications Page 27