lower unit swap on a 30hp Yamaha

[Birdup]

I was out running a river, testing some prop speeds for a friend of mine on his boat. I heard a load smack and look back just in time to see my new prop flying in the air. So I pull up the engine to find the back half of the lower unit is gone. So after saying "$*#&$^&*@$, *&#(*$ and &*#@$^@$" I started calculating the cost of repairing my buddys motor. Then I remembered that the basket case 30ELF I bought for $100 came with an extra lower unit. <br /><br />So my question is. Will a lower unit from a long shaft 1989 30ELF work on a short shaft 1987 30SH?<br /><br />If so, what are some of the things I should look at replacing while I have it apart?<br /><br />Thanks for any help you can give.

 

[Ray Neudecker]

Re: lower unit swap on a 30hp Yamaha

You will need to change out the driveshaft and the shift shaft to make work. Be the perfect time to reseal and replace the water pump.

 

[Birdup]

Re: lower unit swap on a 30hp Yamaha

Thanks Ray,<br />I have a book on order but was wondering what people like to use as a sealant on the yamaha motors for the lower unit?

 

[rodbolt]

Re: lower unit swap on a 30hp Yamaha

on the gaskets and static orings I use quicksilver perfect seal, on the seal OD's I use OMC adhesive M or 3M super weather strip adhesive.<br /> be surre the seal lips face the correct direction and are positioned at the correct depth. measure the seal depths before removal as most manuals dont specify it. always use a new pinion nut and the correct drive shaft holding socket.