Yanmar 3JH4E, Service Manual

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9. Coolant system
280
9.7.3 Cautions
(1) Attach at a position higher than the bilge water away from rain or other water, and 50-
70 cm above the bottom of the boat.
(2) Never run the pump dry. Be sure that the strainer is inserted in the drain water before
pushing the switch. If no water is being drawn up after a period of 10 seconds or more,
prime the pump. (Do not run the pump for longer than 10 seconds when no water is
being drawn up.)
(3) When the pump has not been used for a long period of time, the inside of the pump will
be dry and drawing ability will be lowered. Before reusing, clean the inside of the pump
or prime it to insure that it is wet, and check to be sure that the pump is then operating
correctly.
(4) When charging the diesel engine oil, wait a period of 30 minutes or longer from the
time of stopping (oil temperature 20-70°C). Refrain from operation when the oil
temperature is below 15°C, or above 50°C.
(5) When the bilge inside the pump or hose freezes, completely melt the water with a
steaming towel before beginning operation. When the temperature inside the pump is
low, it will take a longer amount of time for the pump to drain off the bilge.
(6) The impeller replacement kit includes one impeller and 3 washers for adjusting the
side gap. If after replacing the impeller the pump does not drain, place side gap
adjustment washers underneath the bottom plate to adjust. Select the number of
washers used in accordance with the following. (When the pump is draining, the
electric current load is about 5A. When there are too many washers, the electric
current value will be too great and will blow a fuse.)
(7) The pump cannot be used to drain off rain water or large amounts of flood water. The
pump can be run continuously for a period of 10 minutes. After this time it must shut off
for a period of 2 hours before reusing.
(8) Do not use the pump for showering.
If the pump outlet is deformed for showering, the increase in water pressure will
increase the load on the motor and cause motor seizure.
(9) Fix the strainer so that it well not turn upside down or on its side.
(10) When sludge has built up in the bilge to be drained, position the strainer about 20 mm
above the sludge. When the pump is stopped, be sure there is no sludge remaining
inside the pump.
(11) The specific gravity for the battery fluid is 1.25 or more.