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Old 05 May 2014, 12:26   #1
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Seized lower unit

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

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Old 05 May 2014, 12:29   #2
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Originally Posted by popeyethesailor View Post
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.
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Old 05 May 2014, 13:00   #3
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Yep that is out!
I fear it's has not been separated for some time!
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Old 05 May 2014, 13:26   #4
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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!
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Old 05 May 2014, 13:35   #5
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what about using a mallet to lightly tap it off? or trying to stick a flat head in?
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Old 05 May 2014, 13:35   #6
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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.
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Old 05 May 2014, 13:42   #7
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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
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Old 05 May 2014, 13:43   #8
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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!
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Old 05 May 2014, 16:58   #9
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She is off after a lot of hard graft!
The only way was lots of wd40 and using chisels as wedges!
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Old 05 May 2014, 17:08   #10
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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.
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