1974 Johnson

[shooter26]

Hello, I have a 1974 25 HP Johnson 25RL74M and when I pulled the lower unit off to change the impeller I could hear a cracking noise that came from the top of the drive shaft, and once it was out some hard black molded plastic chunks fell out. I can look up inside and see more of this broken part but can't get it out. Just wondering if anybody knows what part this is? and do I have to take the powerhead off to get at it.<br />Thanks for your help.

 

[blueboat1]

Re: 1974 Johnson

Was it hard plastic or rubber that hardended? there are a few thru holes that have rubber seals/guides that the shaft slides throught. maybe they got old and cracked.

 

[shooter26]

Re: 1974 Johnson

I’m sure this is hard plastic (not old rubber) almost a porcelain type hardness.

 

[Xcusme]

Re: 1974 Johnson

Shooter,<br />Are you sure the pieces that fell out are plastic?? You mentioned "almost a porcelain type hardness" Use a magnet to confirm that the pieces are not metal.<br />If the chunks ARE metal, they could be the drive splines from the crank. How do the drive shaft splines look??

 

[shooter26]

Re: 1974 Johnson

The splines were good (not rounded or scored)I'll check to see if it's metal.<br />Thank You,<br />Jay