Posts: 43
Location: Roch NY | Merc impellers will take a set after a while of having the fins curled in the pump. As a result, the low rpm displacement pump action will be diminished-water will slip by the fin and could prevent water from getting through all the passages due to the lower idle pressure. Those impellers need to be changed every 100hrs or annually, whichever comes first so it's really immaterial if you damaged it as the best thing to do is replace it every spring anyway.
As was said before, your telltale is probably one that works off the t-stat circuit so you won't see anything come out till they open up. |
