2HP change impeller, remove drive shaft?

[TonyE]

Hi All,

I have a 2HP 2M Mariner (Yamaha built) 1986 outboard with a impeller that is more or less self destructed. The Model Sn is 6A1 / 130202.

I was able to get the lower unit off with some effort. Some surprises, the drive shaft is surrounded by a stainless steal tube. This obviously had to be removed to get to the impeller so I pried it off with a good deal of force.

Now my problem is more basic, the drive shaft and the outer plate is thicker above the water pump, so there is no way to slide the impeller down the drive shaft to the water pump.

Due to the bottleneck at the impeller, it looks like I will need to take apart the propeller drive shaft to get to the circlip to remove the drive shaft. It is really this tough to change the impeller on the 2hp yamaha / mariner engines? I hope I am missing something more obvious?

 

[saumon]

Re: 2HP change impeller, remove drive shaft?

Hi have a 2hp Yam and, beleive it or not, the impeller is not on the drive shaft, as usual, but on the prop shaft, so nothing is impossible...

 

[kandil]

Re: 2HP change impeller, remove drive shaft?

Yes you are missing the manual I think like saumon said the impeller is not on the drive shaft, as usual, but on the prop shaft.
you did not need to take the lower unit off.

 

[TonyE]

Re: 2HP change impeller, remove drive shaft?

Thanks for replies! I was hoping that the impeller was in the prop shaft, but no such luck at least not for this 1986 2hp yam/mariner. A bummer since it has no gears so no reason not to design it this way. My 3rd party manual was close but did not shared that the drive shaft would need to be removed.

I ended up taking the prop shaft apart, which was relatively easy to do. Removing the circlip at the end of the drive shaft through the propeller shaft was removed easily.

Before realizing the drive shaft needed removed, I did waste some time removing the stainless steel tube around the drive shaft. This would have gone with the drive shaft after the circlip was removed.

The impeller was in terrible shaft, having melted to the point that almost all of the holes to feed water to it were clogged with melted plastic. I only ran this motor for a few minutes before attempting to change the impeller which is something I regret now. Guess I was lucky it was a cold day and I didn't burn this engine up (or at least hope I didn't).

Now I'm going to get some locktite A and piece everything back together as watertight as I can to test. I'll see if I can get this sucker to run again.