Lower unit wont mate up

yimmyb

Seaman
Joined
Feb 22, 2017
Messages
53
Installed a new water pump in the lower unit of a 1980 Mercruiser sterndrive serial number 5583873. Upon following all the directions in the Seloc manual the lower unit will not mate up. It comes within an inch and no farther.
 

Bt Doctur

Supreme Mariner
Joined
Aug 29, 2004
Messages
19,093
Guessing a Alpha1 , How hard its it to follow Seloc directions, "Place manual on ground , kneel on it"
With the control box in fwd gear and the impeller prelubed and water inlet bushing slightly greased
Place lower unit in fwd gear by rotating the splined shaft fully CW
Raise drive up , slightly turning propeller CCW to rotate driveshaft splines untill splines engage
Make sure lower brass shoe locates correctly on the splines in the lower shaft and is in a straight line "fwd gear"
Install side nuts and snug, making sure upper and lower shoes mate correctly install remaining nuts
Fill with oil from the bottom
 

CamaroMan

Petty Officer 1st Class
Joined
Mar 18, 2016
Messages
323
did u turn the prop ? sometimes the gear splines will hook up - its in forward right? so u turn prop COUNTER clockwise to rotate splines - either that or the water hose but prob the small spline shaft.

when its on make sure the fwd/n/rev are working before u button it all up..
 

JoLin

Vice Admiral
Joined
Aug 18, 2007
Messages
5,146
The sequence is to try to push it on, then back it off, turn the prop shaft a fraction and try again, I've had it slide in on the second try, and I've had it slide in on the 20th. Take a break and do it again. Don't give up.
 

Bondo

Moderator
Staff member
Joined
Apr 17, 2002
Messages
70,465
. It comes within an inch and no farther.

Ayuh,.... Which is about the length of the spline engagement,...

Turn the prop counter clockwise a tiny bit,...
 
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