Stuck lower unit on '81 Evvy 25

EricR

Petty Officer 1st Class
Joined
May 17, 2007
Messages
296
I have taken on a project on a buds boat in exchange for some electical work in my house-

It's an '81 vintage 25 Evinrude, hasn't run in a year or two. Has fired with a new battery when the guy looked at it-

I am going to pull the lower and put an impeller or if need be an entire pump in it, and check out the lower. It's a shear pin type lower, I thought they went to thru hub exhaust in the late 70's but I guess they didn't.

Of course the cavitation plate has a big hunk broken out of it, and a crack on the other side, which I will get one of the welders I know at the local yacht repair yard to TIG up for me.

However, when I removed the bolts to drop the lower and unhooked the shift rod, no go. Oh, I can wiggle the leading edge of it back and forth, but she's stuck and I am certain all the bolts are out.

Now some years back my old 18 fast twin did the same thing, I ended up pulling/prying the foot off, and the pin in the driveshaft broke the water pump housing on it's way out. I had to pull the powerhead complete with shaft from the middle leg, then clamp the driveshaft in a vice with the powerhead hanging down below it, and put a box full of packing material to catch the falling power head. I PB blaster'ed the poo out of the end of the crankshaft where the driveshaft was stuck in it, hit it with some heat, and wailed on it with a big punch to separate it.

I will try a bit harder on this one, but think I will have to pull the motor off the boat it is on, stand it "on it's head" and spray PB blaster down the shaft via the shift rod hole with a nozzle on the can and hope it makes it into the union of the crank and driveshaft, let it soak a day or two.

Do y'all think that will work, or do I have another problem? I had one nut on a stud at the rear of the foot, and two small bolts with 3/8" wrench size heads on each side of the foot, and the shift rod coupler undone. I don't see anything else in the way.
 

HighTrim

Supreme Mariner
Joined
Jun 21, 2007
Messages
10,486
Re: Stuck lower unit on '81 Evvy 25

If in fact you have got to all the necessary bolts, and I believe you have, your removal method should work. Use shims to slowly seperate the lu, along with PB blaster as stated. Dont forget to add some marine grease to the splines during re installation! :)
 
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