Water pump impeller

[team supra]

Is it wise to replace impeller every year after long winter storage. Do you have to replace housing and all gaskets and wear plate also?

[vnemous]

What motor? On 3 liter you dont have to change housing unless damaged. We do cooling service on customers boats every 3 years. On my own boat I change impeller every year. JMO

[team supra]

260 efi offshore. Guess it’s best to take a look at housing and change impeller since it’s been same position for 8 months

[ghost28]

change it all including the seal plate below the pump every season...cheap insurance agaist overheating or losing an impeller blade...

[nitro_rat]

My boat is not stored in a climate controlled area so I pull my lower every fall before the first freeze. Since I have it off I usually pressure test, change the oil, and replace the impeller. This year I think I’ll change the whole pump since I know it’s been 3 or 4 years since the last time event though it still looks good!

[team supra]

Cheap issuran e is right. Better safe than sorry. Thanks all

[Capt.Insane-o]

89984 imellers every year, floppy 43026 impellers 3-5 years.

[Fishinmymission]

Are those two impellers interchangable on the standard 2.5 lower units? I see the 89984 listed as the part for the standard lower unit.
Any idea what increases the service life of the 43026 impeller?

Edit comparing the pictures looks like the impellers are not interchangeable. Looks like the 43026 is for the 3 liter models and reportedly lasts much longer.
After getting impeller pieces jammed in my 2.5 once It's back to changing the 89984 impeller every season.

[pkstv]

The 47-89984T has the brass sleeve that’s stronger and holds up under high RPM’s ! I wouldn’t trust any other . It is what it came with from the factory .

[big tom]

So where is the best place to shop for the better ones?. Merc dealer?.

[pkstv]

Yes ! Have your local merc dealer order a 47-89984T !

[One Oldman]

The most common failure on most is that the impeller will become 'set' after sitting.

[Capt.Insane-o]

Not much of a merc dealer if they have to order an 84 impeller.

[big tom]

So the merc parts list , lists a #43026t2, for my 1999 250 efi's. but I should use a 47-89984t ?..

[vnemous]

4053908M0100526 is the repair kit for a 3 liter waterpump

[vnemous]

43026t2 is just the impeller