"Dave" wrote in message
...
On Sat, 10 Nov 2007 23:49:28 -0500, Wayne.B
said:

Based on my experience with the small Yanmar in my genset, I'd
recommend being even more proactive than that. The impellers seem to
self destruct after about 200 hours so it's better to replace them on
a periodic basis before that happens.

I change mine annually as part of spring maintenance,, and keep the old
one
as a spare.

Overkill! I bet you change the oil and filter in your car every 200 miles.
Changing your impeller every spring is about that premature.

Wilbur Hubbard