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Old 20 February 2005, 14:21   #1
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Engine Advice

I've got a Tohatsu, 2-stroke outboard, 70hp and it has totally seized up. It has not been running for at least 18 months. The flywheel is locked solid - can anyone give me advice on how to free it up/ strip it down? I'm guessing it will be a lot of work. Is the flywheel the first thing to remove?

Many Thanks in advance
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Old 20 February 2005, 14:36   #2
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This guy has a Tohatsu 90 only he has wrecked his gearbox, so perhaps you could do a deal with him, like sell him yours. However can't guarrantee they are a straight swop.

paul@towns-wadey.com

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Old 20 February 2005, 15:05   #3
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You totally sure it's seized?

I had an old engine which I thought was, until I removed the flywheel cover and discovered that the starter motor was jammed against the flywheel. A tap of a hammer later, and it was running!
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Old 20 February 2005, 15:42   #4
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Yea i'm sure its seized -removed fly wheel cover etc. tried turning it but its locked solid
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Old 20 February 2005, 16:03   #5
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I guess it seized from standing for 18 months, is this correct?
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Old 20 February 2005, 16:30   #6
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Quote:
Originally Posted by Hightower
I guess it seized from standing for 18 months, is this correct?
YES
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Old 20 February 2005, 19:31   #7
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I would hazard a guess that your crankshaft has rusted and piston rings stuck to the lining of the cylinders. An easy crankshaft and journal, rings replacement might be only nessasary.

I would suggest looking at the easy bits first like the before mentioned starter motor, etc. Then progressing to the internals.

I'm afraid I cannot advise you on how to strip a Tohatsu, but they are Nissan in the States and I'm sure you'll get the info from a Search engine.

Good luck though and keep us posted.

Andy
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Old 21 February 2005, 06:03   #8
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I think you can get these from fairweather marine or Amazon if you need them

http://www.themotorbookstore.com/tohoutrepman.html
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Old 21 February 2005, 09:58   #9
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Hi

This might not work for your engine, but I have used this trick once before

Lay your engine down on the back and remove the spark plugs, fill the cylinder with petroleum, and wait for a few days, then try to turn the flywheel, if it's not moving change the petroleum and start over. Worth trying before you disassemble everything

Best of luck
Rene
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Old 21 February 2005, 15:09   #10
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Quote:
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Hi

This might not work for your engine, but I have used this trick once before

Lay your engine down on the back and remove the spark plugs, fill the cylinder with petroleum, and wait for a few days, then try to turn the flywheel, if it's not moving change the petroleum and start over. Worth trying before you disassemble everything

Best of luck
Rene
I would also add a health squirt of WD 40 , and mix some 2 stroke oil in with the petrol ... but not much.....

I would say that only one piston is seized , the one with exahust port open, and hope that the rings arent stuck...... otherwise is a strip and fee job .....
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