1991 Force 120 HP Lower Unit

[mrbongo]

I have another string going about my fun with this outboard. Lower unit was cracked and I didn't see it. I don't know if that can happen
from running it dry?

Can I use a 1990 20" shaft lower unit to replace? This one is a long shaft. 25" JUst found a used one close by but it's a 90 HP short shaft. 1990.

????

 

[jerryjerry05]

Re: 1991 Force 120 HP Lower Unit

If you have a 25 you need a 25.
If your gonna take it apart and swap pieces.Then you need shim tools to assemble it.
Cracks usually happen from freezing.Or the guts came apart and are forced out??

 

[Frank Acampora]

Re: 1991 Force 120 HP Lower Unit

I THINK from 1990 to 1994 they were all two piece drive shafts. SO: If the 1990 is a two piece drive shaft and your lower is original (two piece also) you can use your upper drive shaft with that lower and it will be fine.

 

[mrbongo]

Re: 1991 Force 120 HP Lower Unit

Thanks for all the help. I'll probably go out and look at it. He sent a picture but it's still attached to the upper part of the outboard. Can you tell if
it's a two piece shaft without removing the lower unit from the motor?

 

[jerryjerry05]

Re: 1991 Force 120 HP Lower Unit

No.The 120 from 90-94 are all supposed to be the same.Two different drive shafts.So your drive shaft will change it to a 25,I was thinking one piece shaft.J