Yanmar 1GM, Руководство по эксплуатации

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Important
When installing the impeller, make sure the direction of the impeller cor-
responds to that indicated in the figure.
3-b)
Adjust the V-belt tension. Check the tension of the
cooling water pump drive belt. If there is too much
tension premature damage to the V-belt will occur. On
the other hand of the V-belt pulley is loose it will slip
and cooling water flow will be insufficient. Loosen the
cooling water pump V-belt tension bolt to adjust the
tension.
Replace the belt if it is worn or cracked.
Adjustment Standard – 5 - 7 mm (with 10 kg
thumb force)