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M50C impeller dimensions

K

KCJ

Contributing Member
I saw a post in this forum some time ago where a contributor listed the dimension of this impeller in inches. Scott said he was right on with his measurements, but I can not find that posting. I know that the shaft is 17mm and that the thickness is 23mm, but I can't be sure of the outside diameter (mine is too worn). Can anyone help? With all the impellers out there, there must be something which would get close. The shaft can be bored or shimmed with an insert, I don't think a couple of mm on the outside diameter would be an issue. The only problem I see is the thickness. Any help would be greatly appreciated.
 
Axial height is critical. Diameter needs to be close. Since the same impeller fits the 45-70A2, why not get one from Scott, or try to find an NOS piece on an auction site, rather than attempting to re-invent the "wheel"?
 
Paul thanks for your reply, but I am not trying to reinvent the wheel. I've cooresponded with Scott on several occasions. With on disrespect to Scott, between his work and material supply issues I don't think he has had time to produce any parts for months, and possibly a year. One poster on this site claimed that Jabsco made an impeller that would fit, and claimed that he had done it and posted the part number. I checked it out, and with an axial height of 1.25 or 1.5 inches, no way! I haven't been able to find any on the auction sites with the part, and the NOS appears to have dried up years ago. As with most manufacturers, a lot of the smaller parts are made by "subcontractors" . Who, with small adjustments, also sell to other manufactures. I know I'm hard-headed, but with 3 other outboard brands coming out of Japan there must be some commonality. It's just obscured by brand and part number, and Yamaha isn't going to help you fix and old Tohatsu! The quest goes on, I just wish Sierra would pick-up this ball!
 
Good points all. Yes, the impellers are all subbed-out, and that is why the supply goes away. Say Tohatsu is using a few thousand of them a year. Then the EPA forces them to change technologies... they end up with a completely different design (say 4-stroke or TLDI), with a different water pump. From that day forward, the sub is only selling a few "repair" impellers per year; not enough volume to keep making a profit on them. Eventually, they let the motor manufacturer know that they are getting rid of the last handful of impellers, and there will be no more made. Suddenly, instead of just being "obsolete", the affected motors are "ornaments". As a result, the only option then becomes aftermarket replica manufacturing. That is the long and short of the "product life cycle" of modern subbed-out manufacturing. Not that I like it; many lightly-used freshwater motors become ornaments that way.
 
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