47-33980
SeaKaye, I just heard back from Brian today. He cited
impeller # 47-89881 and you cite 47-33980.
I find neither number on the Net.
I did have one Merc impeller 47-89981 that I experimented
with, that seemed like a candidate in OD and height.
It was a little sloppy on the bore though.
I found a post on a FB Elgin site, where a fellow in TX
stacked two unknown impellers (he can’t remember what part number),
but instead of drilling the driveshaft for pins, he ran a pin vertical in
the driveshaft splines, and the groove in the impeller hubs slid over
the pin.
He had a video of him spinning the driveshaft in the lower unit over via
drill, and pumping water a few inched up in the air, but he said when he
put the motor back together it wouldn’t pump. He gave up on the motor.
But anyway, I liked the way he used the vertical pin.
I’m awaiting an email back from Brian regarding the Merc part number.
Thanks!
UPDATE – Just heard back from Brian, 47-89981 is the correct part number,
and he suggest NOT to use a vertical pin as it would slide around and chew
up the brass housing.
UPDATE UPDATE: In doing further research, it appears
Sierra impeller 18-3054 would be a better fit on the driveshaft (which is .442 OD)
and is very close in OD and height dimensions of the 47-89981 (18-3039) Brian recommended.
With the 18-3054 impeller, only about .003 from the hub center would have to
be bored out, as Seakaye suggested.
The 47-89981 / 18-3039 has a hub ID of .456 and is sloppy on the .442 driveshaft,
but probably would work.
I’m going to order both impellers and see which works out best.
Prepare to be boarded!
