Impeller shelf life

[ArtJ]

Replaced both impellers fresh and salt on my MMI pumps yesterday

Both impellers were new old stock, never used, and MMI bought in plastic bags.

I was alarmed when later reviewing the plastic bags dates that I had written
on them that one was from 2014 and the other was from 2004!

So much for my stock rotation

I immediately ordered 2 new ones and will swap them out ASAP

They both were a little stiff but that may be normal

What are the warning signs of deteriorating impellers?

Art

[joe_db]

I am not sure, but I found 4 or 5 on my boat that date to the 1980s!

[ArtJ]

When the new ones arrive, I will compare the appearance and stiffness.

If they appear to be the same, I'll try them out and keep the new as spares.

[hanleyclifford]

Hi Art. It's hard to beat the "old stock" impeller rap since no one is obligated to state date of manufacture on the item (unlike tires). I bought an impeller in Annapolis once that failed within weeks. OTOH I've got impellers in my MM501and 502 that are 8 or10 years old. I worry mainly about the salt water side for obvious reasons. I think the best we can do is run the MM pumps with their ease of repair feature and buy (and store) impellers from Moyer Marine. I also carry extra pumps ready to switch.