1984 25hp mercury Lower Unit removal....

[littlejohn2458]

So i am working on this 1984 mercury lower unit, I cannot for the life of me figure out how to disconnect the shift shaft from the engine. I am looking for the nut and the jam nut and cannot find it. Does this old of a motor not use that and where do i go to disconnect the shift shaft. I work on Yamaha and know them like the back of my hand. I told a friend that i could change him impeller and pressure test his lower unit. well, guess what i cannot get it to drop. it is hanging up on the shift shaft.

I believe it is a 1984 (he says) it was registered in 1986 (dealer says) i dont know the exact year and google is testing my patients right about now lol.

25HP Mercury Serial number is 0A728896




Thanks in advance everyone!

 

[carholme]

Re: 1984 25hp mercury Lower Unit removal....

That s/n comes up as:

MERCURY - ( 25 H.P. (1987 ))
Serial No: 0A728896 Model No: 1025227

Parts Listing:

Mercury Parts, 18/20/25 H.P. (XD)

Once you determine if yours is electric or manual you can see the correct shift setup under one of these:

THROTTLE AND SHIFT LINKAGE (ELECTRIC)
THROTTLE AND SHIFT LINKAGE (MERCURY)(MANUAL)

Gerry

 

[littlejohn2458]

Re: 1984 25hp mercury Lower Unit removal....

it is electric. ill take a peek and report back if i have an issue

TY Sir!!!!!

 

[littlejohn2458]

Re: 1984 25hp mercury Lower Unit removal....

where did you go to get the correct year and all?

 

[littlejohn2458]

Re: 1984 25hp mercury Lower Unit removal....

Ok so im still not getting it. i disconnect it under the enginie in the pan?

 

[carholme]

Re: 1984 25hp mercury Lower Unit removal....

Yes, you should be able to see the long shift shaft where it attaches to the coupler and you have to undo a bolt/screw to separate them.
Operate the shifter to locate the coupler where it meets the shift shaft.

Go here:

Small Engine Repair Reference Center Home

and scroll down to page 224 to (Merc 18, 20 [1986-oii] and 25). Read that and see Fig 3, yours should be similar.

Gerry