WHAT DO IMPELLERS DO?
Impellers pump cold water into your boat’s engine to cool it down while in use. If you have a bad impeller it can cause big problems.
HOW DO IMPELLERS BECOME DAMAGED?
Your boat’s impeller is a series of rubber vanes molded around a hub. The tips of these flexible vanes can wear out for many reasons due to simple use or if the boat is in sandy water. The abrasive sand-like material can cause the impeller to wear out faster.
They can also wear out by becoming stiff and brittle due to the motor sitting unused for several seasons or being exposed to heat. Water lubricates the impeller, and if it’s run dry, the impeller can be ruined in a few seconds. Ignore the symptoms of an impeller in need of replacement only if you wish to purchase a new motor.
WHAT HAPPENS IF THE IMPELLER FAILS?
If your impeller fails, the pump can’t pump cool water to the engine causing your engine to overheat. If you catch that your impeller is failing early on, you might avoid major problems. However, if you’re not fortunate enough to catch a bad impeller, the results can be catastrophic to your engine.
WHAT TO DO IF YOU HAVE A BAD IMPELLER?
The general rule is to have your impeller changed every year – the best time being during your lay-up for winter or spring service. If you suspect that your impeller might be worn out, contact your local boat mechanic to schedule a service. Don't be left behind at the dock or on the water with this problem!