Seized lower unit

[popeyethesailor]

Any advice please
Trying to remove my lower unit and it's solid!!

All 5 bolts out and now trying to hammer in a feeler gauge in to separate it along with using pressure from a nut and spacer!

And it's been soaking all afternoon in wd40!!
Just won't budge

[henryfreston]

Originally Posted by popeyethesailor

Any advice please
Trying to remove my lower unit and it's solid!!

All 5 bolts out and now trying to hammer in a feeler gauge in to separate it along with using pressure from a nut and spacer!

And it's been soaking all afternoon in wd40!!
Just won't budge

Attachment 94180

you taken the bolt under the anode out? There is a bolt incorporated with the anode- on yamaha 50hp 2 strokes anyway.

[popeyethesailor]

Yep that is out!
I fear it's has not been separated for some time!

[ring20johnson]

If it's stuck due to salt build up on the studs you will probably get it off. If it's stuck in the crank it may as well be an anchor!

[henryfreston]

what about using a mallet to lightly tap it off? or trying to stick a flat head in?

[captnjack]

Try soaking in big bucket of warm vinegar. Possibly put a camp stove underneath and get it up to a gentle boil. Vinegar or another weak acid solution will help dissolve the salt encrustations inside.

I do this on a smaller scale with scuba dive gear. At least over here, white vinegar by the gallon is pretty cheap.

[popeyethesailor]

Originally Posted by henryfreston

what about using a mallet to lightly tap it off? or trying to stick a flat head in?

I have hammered it all day and hammered feeler garages into the gap!
I think it is the Ali and not the crank as I am getting very little movement between the two

[popeyethesailor]

Originally Posted by captnjack

Try soaking in big bucket of warm vinegar. Possibly put a camp stove underneath and get it up to a gentle boil. Vinegar or another weak acid solution will help dissolve the salt encrustations inside.

I do this on a smaller scale with scuba dive gear. At least over here, white vinegar by the gallon is pretty cheap.

That may just have to be done!

[popeyethesailor]

She is off after a lot of hard graft!
The only way was lots of wd40 and using chisels as wedges!

[A1an]

Did you find out what was keeping it in place?

I have a set of axe head wedges for this very job, they spread the load evenly and don't damage the delicate alloy.

Take a look at the splines on the end of the drive shaft where it locates in the end of the crank, make sure the splines are ok, are they dry of grease?

I've just had the same thing with a Mariner 60 and both parts of the splines were dry as a nuns chuff, they two had pretty much become one. I got my hands on a bore camera to check the splines on the end of the crankshaft and all is good.

[popeyethesailor]

Originally Posted by A1an

Did you find out what was keeping it in place?

I have a set of axe head wedges for this very job, they spread the load evenly and don't damage the delicate alloy.

Take a look at the splines on the end of the drive shaft where it locates in the end of the crank, make sure the splines are ok, are they dry of grease?

I've just had the same thing with a Mariner 60 and both parts of the splines were dry as a nuns chuff, they two had pretty much become one. I got my hands on a bore camera to check the splines on the end of the crankshaft and all is good.

It was just the studs holding against the alloy! Surprisingly tightly !
I am 99% sure it was not the shaft as while prying the two parts apart there was no flex between the two and it was solid at the studs, if that makes sense,

The splines on the shaft look good and are dry am I right in thinking that I should not grease these??

[A1an]

Lightly grease them, I use a little paintbrush thats in my grease pot.

If I'm honest I always wire brush and grease a bolt before putting it back in, I usually run a tap down the threads too to clean out any of that white corrosion. I only do this to a bolt that I take out for the first time.

[Nos4r2]

Originally Posted by A1an

Lightly grease them, I use a little paintbrush thats in my grease pot.

If I'm honest I always wire brush and grease a bolt before putting it back in, I usually run a tap down the threads too to clean out any of that white corrosion. I only do this to a bolt that I take out for the first time.

Seconded. Good advice