Engine Advice

daveh · 20 February 2005, 18:21

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

Pete7 · 20 February 2005, 18:36

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

Pete

Tim M · 20 February 2005, 19:05

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!

daveh · 20 February 2005, 19:42

Yea i'm sure its seized -removed fly wheel cover etc. tried turning it but its locked solid

Hightower · 20 February 2005, 20:03

I guess it seized from standing for 18 months, is this correct?

daveh · 20 February 2005, 20:30

Quote:

Originally Posted by Hightower

I guess it seized from standing for 18 months, is this correct?

YES

Hightower · 20 February 2005, 23:31

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

catjasp · 21 February 2005, 10:03

I think you can get these from fairweather marine or Amazon if you need them

http://www.themotorbookstore.com/tohoutrepman.html

Rene · 21 February 2005, 13:58

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

TIM · 21 February 2005, 19:09

Quote:

Originally Posted by Rene

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 .....

slimtim · 21 February 2005, 19:21

Use plus gas as an unseizing thingy

Hightower · 21 February 2005, 20:43

If you manage to free up an outboard in this manner, do you not have to worry about scoring your cylinder bores or getting rust particals in the bearings?