COOLANT SYSTEM
Bilge Pump and Strainer Components and Functions (Optional)
12/05
6LY3 Service Manual
7-23
© 2007 Yanmar Marine International
Troubleshooting the Bilge Pump
Refer to the following countermeasures for difficulties that arise.
Problem Cause Countermeasure
Pump does not turn. Faulty wiring. Check the wiring between the motor and
battery.
Faulty battery. Check to see if the specific gravity of the
battery fluid is greater than 1.25.
Recharge or replace the battery.
Faulty starter switch. Consult your local Yanmar Marine dealer.
Faulty pump. Consult your local Yanmar Marine dealer.
Pump turns, but does not draw up water. Draws up air. Check the hose connections.
Retighten the pump bolts.
Low voltage in the battery. Check to see if the specific gravity of the
battery fluid is greater than 1.25.
Recharge or replace the battery.
The distance between the pump and the
surface of the water is too great.
Lower the pump. (Position the pump so
that it is closer to the surface of the water.)
The pump is too high. Lower the pump. (Position the pump so
that it is 50-70 cm (20-28 in.) above the
bottom of the boat.)
The pump intake is weak. If the intake is still faulty after priming,
consult your local dealer.
Pump turns, but the amount of discharge
is low.
Clogged strainer. Clean the strainer.
The hose is broken or damaged. Check for damage and repair. If the
incorrect hose has been used, replace
with the regulation type of hose.
Water leakage from the pump. There is water leakage from the seals. Retighten the pump bolts.
Faulty pump seal. Consult your local Yanmar Marine dealer.
Pump draws up bilge, but the motor stops
when the hand is removed from the starter
switch.
Faulty diaphragm switch. Check for loose wiring in the diaphragm
switch and correct.
Damaged diaphragm switch. Consult your local Yanmar Marine dealer.
Motor does not stop when there is no bilge
water left.
Clogged strainer or hose. Clean the strainer or hose.
Damaged diaphragm switch. Check for continuity at the diaphragm
switch terminal. Consult your local
Yanmar Marine dealer if there is
continuity.
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