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Jan 23rd, 2013
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Evinrude 1981 115hp Lower Unit Swap Out #12310870
06/25/17 10:40 PM
06/25/17 10:40 PM
Joined: Dec 2012
Posts: 671
Mineral Wells, TX
B
BrazosRiverTom Offline OP
Pro Angler
BrazosRiverTom  Offline OP
Pro Angler
B

Joined: Dec 2012
Posts: 671
Mineral Wells, TX
What I can find on the web is that lower units from 85-140hp 1978-1991 will bolt up fine to a 1981 115hp Evinrude. My question is would the internals be different on a 140 vs a 115 hp lower unit. I looked at parts numbers on boats.net for both motors and all the internal numbers are different between the two. Will it run okay on either motor. Reason I ask is I got a chance to pick up a lower unit off a 1982 140hp and would like to put is on my 1981 115hp. Mine is leaking and it would be cheaper to swap out the units than to get the lower unit repaired. Appreciate any advice.

Re: Evinrude 1981 115hp Lower Unit Swap Out [Re: BrazosRiverTom] #12310910
06/25/17 11:28 PM
06/25/17 11:28 PM
Joined: Feb 2013
Posts: 117
bowie tx
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killen Offline
Outdoorsman
killen  Offline
Outdoorsman
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Joined: Feb 2013
Posts: 117
bowie tx
would check shaft size and count splines

Re: Evinrude 1981 115hp Lower Unit Swap Out [Re: BrazosRiverTom] #12310992
06/26/17 12:51 AM
06/26/17 12:51 AM
Joined: Jan 2009
Posts: 1,272
Denton Tx.
S
spankyttx Offline
Extreme Angler
spankyttx  Offline
Extreme Angler
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Joined: Jan 2009
Posts: 1,272
Denton Tx.
there all 2/1, 13/26 and all the same splines, your good. 77-78 was the change over (shifting was reversed) and only the early 140's had the smaller gear 13/25


LI-SI-WI-NWI
Re: Evinrude 1981 115hp Lower Unit Swap Out [Re: BrazosRiverTom] #12311201
06/26/17 03:15 AM
06/26/17 03:15 AM
Joined: May 2003
Posts: 11,496
Littlefield Tx & Lake A. H. US...
gary purdy Offline
TFF Guru
gary purdy  Offline
TFF Guru

Joined: May 2003
Posts: 11,496
Littlefield Tx & Lake A. H. US...
Only thing you have to do is use the shift shaft out of your old lower and make sure the replacement has the same length main shaft. Take note of number of turns it takes to turn the shift shaft to all in from its original position. Normally 5 to 7 turns out. I put a 1991 V6 lower on a 2006 E-Tec. had to change the main shaft and the shift shaft


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