gcarter
05-31-2004, 07:33 PM
My '86 Minx has the original Alpha drive w/integral water pump.
My plan entails removing the drive pump and replaceing it witha engine driven seawater pump and a transom water pickup.
My problem is the shaft driving the pump impellor has a "chord" type key to drive the impellor. This key is approx 1.13 long X .44 wide X .13 chord thickness and weighs < .25 oz or <5 gr (the minimum of my wife's cooking scale). If I had to guess, I'd say about 1/2 of those.
Now I'd like to ditch the key but I'm concerned about balance. One alternative woulod be to cut down the old impellor to th e fiberglass core and "glue" it and the key to the shaft.
Oh yeah, the shaft diameter is .875".
I haven't done any engineering for 17 years or about the time I started my business. I need some help! :redface:
Photo #2 is the lower unit shaft with the flat and photo #1 is the key.
Please help;
George
My plan entails removing the drive pump and replaceing it witha engine driven seawater pump and a transom water pickup.
My problem is the shaft driving the pump impellor has a "chord" type key to drive the impellor. This key is approx 1.13 long X .44 wide X .13 chord thickness and weighs < .25 oz or <5 gr (the minimum of my wife's cooking scale). If I had to guess, I'd say about 1/2 of those.
Now I'd like to ditch the key but I'm concerned about balance. One alternative woulod be to cut down the old impellor to th e fiberglass core and "glue" it and the key to the shaft.
Oh yeah, the shaft diameter is .875".
I haven't done any engineering for 17 years or about the time I started my business. I need some help! :redface:
Photo #2 is the lower unit shaft with the flat and photo #1 is the key.
Please help;
George