Yanmar 3YM30 Sevice Manual page 49

5) After supplying cooling water, fit the filler cap and tighten it firmly. To reassemble the cap, align the
tabs on the bottom of the cap with the notches on the filler port and turn clockwise 1/3 of a turn.
6) Remove the coolant recovery tank cap and fill with coolant mix to the lower limit. Replace the cap to
the coolant recovery tank.
Coolant recovery tank capacity: 0.8 L (1.7 pints)
7) Check the rubber hose connecting the coolant
recovery tank to the fresh water cooler. Be sure
the hose is securely connected and there is no
looseness or damage.
When the hose is not watertight, an excessive
amount of cooling water will be used.
(7) Clean the element of the air intake silencer
1) Inspection of the intake silencer
Occasionally, disassemble the intake silencer,
remove the polyurethane element and inspect it.
Because the element filters the air, if it is used over
a long period of time it will become clogged and
this decreases the amount of intake air, and may
also be a cause of decreased output.
2) Washing the intake silencer element
Wash the air intake silencer element with a neutral
detergent.
To fresh water
cooler
Rubber hose
Coolant recovery tank
Element
34
2. Inspection and adjustment
Cap
FULL
LOW