replaced the impeller on the F225txrd last month - was performing fine, but had been in use for 27 months, about 600 hours
the removed impeller looked great - never suck up sand, or run it dry - so the rubber surfaces were pristine
but it had acquired substantial "set"
Yesterday I happened across a lightly-used impeller from my Mercury (the powerhead is Yamaha, but the LU is Merc)
Was reminded that, in contrast to the Yamaha, there is "no up or down" to the Mercury impeller keyway
Raises interesting questions
are all Yamaha impellers "directional" - an "up" and "down" side of the keyway? and why?
and with a non-directional Merc impeller - if that was removed with a "set" - but otherwise in excellent condition -
why not re-install it going the other way - to compensate for the set?
the removed impeller looked great - never suck up sand, or run it dry - so the rubber surfaces were pristine
but it had acquired substantial "set"
Yesterday I happened across a lightly-used impeller from my Mercury (the powerhead is Yamaha, but the LU is Merc)
Was reminded that, in contrast to the Yamaha, there is "no up or down" to the Mercury impeller keyway
Raises interesting questions
are all Yamaha impellers "directional" - an "up" and "down" side of the keyway? and why?
and with a non-directional Merc impeller - if that was removed with a "set" - but otherwise in excellent condition -
why not re-install it going the other way - to compensate for the set?
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