How do I know if my impeller needs replacing?
Inspect for signs of leakage around the pump housing – if you see leakage there, it’s time for replacement. Many boating experts recommend replacing the impeller once a year no matter what, as a notable amount of wear can still occur, but not be enough to cause the telltale leak.
What happens when boat impeller fails?
At the heart of your water pump is a small rubber device called an impeller. If your impeller fails, the water pump cannot pull in water, and your engine will overheat – and potentially leave you stranded far from shore, adrift with no power.
How often do you change the impeller on a Mercury outboard motor?
In most cases, you won’t need to replace the water pump unless the housing is damaged. Instead, replacing the water pump impeller every three years or sooner should avoid most water-pump-related issues and keep your outboard running in excellent condition.