Lower Unit Will Not Go Back On!!!!!

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pamlicopanther

Seaman
Joined
Jun 22, 2008
Messages
50
So I took off the lower unit on my 2002 150 and replaced the impeller and gaskets with no problems. Today I went to put it back on and it will not go back on. I can get it about an inch from being on but it will not go any farther. I have turned the shaft, turned the flywheel, twisted, pushed, pulled - I have tried everything I could think to get this up and I just cannot do it. I shined a flashlight up and cannot see any kind of obstruction.

This is my first time doing this with a Mercury. Others in the past I had no trouble, but this one has me beat:mad:.

Any suggestions? Thanks.
 
produceguy

produceguy

Lieutenant Junior Grade
Joined
Sep 30, 2010
Messages
1,243
Re: Lower Unit Will Not Go Back On!!!!!

I had the same problem on a alpha 1 gen 1 . First make sure helm is in foward gear and gear shaft on lower unit is in foward gear. on lower unit i had to pull up on gear shaft on lower unit with needele nose pliers and turn shaft all the way clockwise. will not pull up much or turn to much.Second make sure the brass gear tube is in foward . Idid this by looking at the locking pin and used common sense on how it push in if it was forward .THIRD line up tubes and gear shaft try not to knock it out of gear. I hope this helps.:)
 
T

turtles11756

Petty Officer 1st Class
Joined
Dec 5, 2007
Messages
260
Re: Lower Unit Will Not Go Back On!!!!!

don't force it . when everything is lined up right it will go back together with little more than finger pressure
 
paultjohnson

paultjohnson

Lieutenant Commander
Joined
Jul 29, 2010
Messages
1,560
Re: Lower Unit Will Not Go Back On!!!!!

Have you checked engine alinment ?

i just realized it was an outboard my bad DUH navermind:rolleyes:
 
chum1

chum1

Petty Officer 1st Class
Joined
Apr 15, 2010
Messages
359
Re: Lower Unit Will Not Go Back On!!!!!

Probably just one component not aligning perfect, dont give up....i know those things get heavy and there is just so many working seconds of being a weight lifter, i make sure both lower end and upper end are in neutral before mine goes together, the shift shaft tends to jam in splined socket
 
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pamlicopanther

Seaman
Joined
Jun 22, 2008
Messages
50
Re: Lower Unit Will Not Go Back On!!!!!

Thanks for all the responses.

I finally got this thing back in after working with it all day. I had to keep turning the prop and wiggling the lower unit while I pushed it up. I finally hit the sweet spot and everything went smooth after that.:D
 
D

Dave1027

Lieutenant Junior Grade
Joined
May 25, 2010
Messages
1,080
Re: Lower Unit Will Not Go Back On!!!!!

You don't turn the prop. Turn the flywheel.
 
C

Chris1956

Supreme Mariner
Joined
Mar 25, 2004
Messages
27,843
Re: Lower Unit Will Not Go Back On!!!!!

The best way to install the gearcase is with the motor in neutral. So, in order to align the driveshaft, one would need to turn the flywheel.
 
J

J Hartman

Petty Officer 3rd Class
Joined
Jul 3, 2010
Messages
93
Re: Lower Unit Will Not Go Back On!!!!!

take a flashlight and shine it up into the bottom end of the engine. If you see a brass "washer" in the way of the drive shaft hole, you need to line that up first, something long and skinny to get up in there to move it with, maybe with a little grease on the end, so when you get it where you want it, it stays in place. it's a booger when that washer moves, but all hope is not lost. I had some trouble with mine after replacing the impellar as well. and what your explaining sounds a lot like what happened to me.

hope that helps you.
Jeremy
 
produceguy

produceguy

Lieutenant Junior Grade
Joined
Sep 30, 2010
Messages
1,243
Re: Lower Unit Will Not Go Back On!!!!!

wow im in the wrong room. sorry
 
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