Originally Posted by Jim Cate
Frankly, I'm astonished at the replacement schedules posted above!!!
OUr raw water
pumps have always been bog standard Johnston pumps, and the impellers last around a thousand hours before starting to shed vanes. So, I replace them at around 900 to 1000 hours... or if I forget, when the water
ceases to flow!
agree... but they are like $5 each. In the last 7 seasons, I had 2 impellers fail (broken or torn blades) after leaving them in over the winter. I think the blades just don't like to be left bent over a period of time.
They are the least expensive part on the boat. If it comes out for inspection
at the end of the year, it doesn't go back in.
I think if it were run more often it would last longer.
It is just part of my winterization. right after I change the oil
and filters, I pull the impeller and o-ring and toss them. I leave a new one near the motor
to install in the spring.
There are still people who change the oil
in their cars every 3,000 miles, even though the interval is now 10-12,000 miles. At least the impeller is a lot less expensive than that!