1972 T120v Disassembly
- Thread starter saig55
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Whichever is easiest. Seems you can get some wd40 or equivalent in through the exhaust ports. Personally I’d take off as much as I could off the top first. Easier to lift what’s left on.
You know the tacho drive mounting to the engine is a left hand thread?
It's also possibly easier to get the pesky pistons moving leaving engine in frame. Otherwise engine needs supporting well when you give them a thump, if they are salavagable.
So, leave wheels and stand on too until seized engine is unseized, if can be
Definitely need to think about having a solid engine mount to use, otherwise you need to build one.
Also take out clutch, etc , while in frame, as again need to hold engine steady somehow.
Btw, don't bang on the pistons s if at TDC. Fingers crossed they are half way up cylinders.
It’s a bit like cutting wood, measure twice before cutting, think twice before acting. Good luck and hopefully everything goes smoothly. Looking forward to your progress!
The left side piston just started it’s exhaust stroke… so it’s coming up and it’s the one that has rust…
I'd put a lump of wood on it, hit with clump hammer. Aim well!!!
Could have been worse. Seen worse in car engines. Cannot tell for sure, but the cylinder as seen doesn’t look like it couldn’t be worked out. Are you seeing deep scores and pitting? Larger pistons perhaps and honed out. I’m sure one of the knowledgeable classic members will chime in.
What’s the metal pin in the fourth picture top cylinder?
What’s the metal pin in the fourth picture top cylinder?
It is at about 7 o'clock, in the cylinder; could be a scratch in the image, or a very fine metal shaving. But it is so straight, it looks like a pin. By the way it is in the same image that has red fluid in the other cylinder.
That is a likely explanation. Please make sure it doesn't get down into the cylinder.
I mentioned the T140 I took apart was really rusted, welded together by corrosion. Had 10,000 miles on clock. Header pipes had rusted away, head partly dissolved away,and carbs dissolved too, so total mess inside... the swing arm had rusted away... BUT...
The rusted-together pistons and cylinder walls protected the bottom end. Crank was fine. Gearbox and primary fine too, as in separate sealed compartments. That's all I saved in the end, crankcase, bottom end and gearbox, and pitted frame. And tank, which weirdly was not rusty inside .So, I'd just guess you have a low mileage bike, not a rebuild engine.
