lower unit interchange.....

Stachi

Lieutenant Commander
Joined
Jul 14, 2009
Messages
1,671
Hey guys,
I am wondering if there is any reason I cannot replace the lower unit on my '87 Force 125 with the lower unit from my '90 Force 120.....??? Thanks in advance for any and all help.....
 

Frank Acampora

Supreme Mariner
Joined
Jan 19, 2007
Messages
12,004
Re: lower unit interchange.....

Should go right on. Bolt pattern and castings are the same, but may need to grind a little aluminum out of the midleg to clear the Mercury designed water pump though.
 

Stachi

Lieutenant Commander
Joined
Jul 14, 2009
Messages
1,671
Re: lower unit interchange.....

thanks for the reply Frank , castings are not quite the same, although they bolt up the same....the plate below the water pump is different, as well as the casting from that point south.....I have the benefit of being able to see the two units side by side....only diff I can see may be in the exhaust... not sure if it will make any difference though..I was hoping maybe someone had a source to check if they were interchangeable... I will post some pics as soon as I can figure out how to here...you will see why I am wondering about it...the main reason I want to know is: should I keep it as a spare (nothing wrong with it) , or sell it
but ,thanks again brother...
 
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