84 Black Max 200 - Tempest Prop - Mating Issues

wcsd106

Petty Officer 2nd Class
Joined
Mar 27, 2010
Messages
182
Hello,

I have a 1984 Mercury Black Max 200HP that I finally got back onto the water after several years of being dry.

When I ran the boat on a test run, I found that the prop hub had spun and I was not able to get onto plane.. RPMs would climb but boat felt like it was slipping back into the hole.

I took the prop to the repair shop and it is being repaired right now. The repairman said it looked to him that the hub had spun also.

Needless to say, I disliked the idea of only having one prop for my outboard. I have been unable to locate the spare prop that is somewhere in the garage or shed, so I found a good deal on craigslist for a Tempest prop locally.

The individual I purchased the prop from stated that he had run the prop on a 80's model Merc 150 outboard. The prop was in great condition and the price, at $225, seemed right so I purchased it and took it home.

My problem comes when I have been trying to install the prop onto the shaft. The prop slides freely onto the shaft and all splines mate until about 1/4 inch from the end where the prop hangs up and doesn't want to move any further.

I hauled the boat and new prop to the local outfitter today and had it checked out. I was told that the prop should fit my outboard and that I probably had a burr on the driveshaft of the outboard. I was advised to lightly touch up the driveshaft with a small file and to clean it up good.

I have been working on it for the past few hours, but I simply cannot get the prop to get within about 1/2" of where it should end up. The service tech checked the thrust washer and said that it was the appropriate one, but the prop is hanging up in the splined area.

I have turned the prop around and placed it onto the shaft and it slides on smoothly until about 1" from the end of the splined area.. then it hangs up.

I am out of ideas and running out of patience so if anyone has some suggestions I would greatly appreciate them.

Thank You in advance.
 

wcsd106

Petty Officer 2nd Class
Joined
Mar 27, 2010
Messages
182
Re: 84 Black Max 200 - Tempest Prop - Mating Issues

Ok. Just got back from the prop shop. I brought the new prop up there with me and had it checked while I was there. It drops right on a prop shaft he had sitting around... So the prop is fine.

Brought home the prop with the new hub and now it will not slide onto the prop shaft either... Something is wrong with the prop shaft.

I turned the newly-hubbed prop around backwards and marked the farthest point I can get the prop to. I've been searching around that area for burrs but have found none. In fact the shaft seems to be in better shape that the one my prop repairman used at his shop.

Suggestions?
 
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