Troubleshooting
14
WARNING
Before troubleshooting or attempting to service, read the following safety rules.
Before attempting to service the water pump
:
1. Review
troubleshooting
table
Review the Troubleshooting Table below for the type of problem you are
experiencing.
However,
DO NOT attempt to repair until the steps listed below are
followed.
2. Flush the pump
Pump pure water
briefly to clean out the pump.
3. Drain the water
pump
Drain the water pump completely of water
using the water pump drain plug, to
prevent freezing.
4. Disconnect
power
Switch off the engine and unplug the spark plug wire.
5. Perform repairs
Follow the directions provided in the troubleshooting table to repair the water
pump.
PROBLEM
CAUSE
SOLUTION
1. Engine will not turn over
See engine owner’s manual
Pump doesn’t revolve
2. Rusting/Sticking of impeller
Disassemble and clean
1. Priming chamber not full enough
Add more water to priming chamber
2. Air leaks on suction line joints
Check for loose screws or broken hoses
3. Quick coupling gaskets worn
Replace gaskets
4. Loose or broken hose clamps
Tighten or replace hose clamps
5. Priming chamber is over heated
Pour cold water in chamber or let cool
6. Engine speed is too slow
Increase engine speed
7. Worn or broken volute or impeller
Replace worn or broken component
Pump fails to prime
8. Worn or broken mechanical seal
Replace mechanical seal
1. Clogged suction hose
Clear obstruction
2. Dirty suction strainer
Clear suction strainer
3. Flow restriction due to hose kinks
Straighten suction and discharge hoses
4. Suction lift too high
Move pump closer to water surface
5. Engine speed too low
Increase engine speed
6. Worn or broken mechanical seal
Replace mechanical seal
7. Reduced engine performance
See engine owner’s manual
8. Clogged impeller
Remove clog
Low capacity
9. Worn impeller
Replace impeller
