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Post by duosport on Jan 22, 2013 9:50:30 GMT -5
I have a 2 stroke with a broken piston. If I replace the piston, must I split the case and completely redo everything because of the metal fragments from the shattered piston?
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Post by Fox on Jan 22, 2013 17:43:17 GMT -5
I've done a few like that. I remove the engine from the scoot and hang 'em up so the crank is pointing at the ground and flush 'em out real good with the water hose while rotating the crank. Then let them drip dry for a while and reassemble.
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Post by duosport on Jan 22, 2013 19:40:24 GMT -5
I've done a few like that. I remove the engine from the scoot and hang 'em up so the crank is pointing at the ground and flush 'em out real good with the water hose while rotating the crank. Then let them drip dry for a while and reassemble. I have read doing the same thing but with gasoline instead of water. Fill the up right engine half full with gasoline slosh it around, turn the crank and empty and repeat. Finally do it with two stroke oil. The water gives me the willies. |
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Post by Fox on Jan 22, 2013 20:48:31 GMT -5
You can do it with gas. If you pour the gas in the engine out through a rag to catch the metal you can reuse it over and over.
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Post by duosport on Jan 22, 2013 21:05:51 GMT -5
good idea. It woill be interesting to see what kind of shards I can recover.
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Post by Moat on Jan 23, 2013 6:22:09 GMT -5
I'd recommend mineral spirits or kerosene, instead - gasoline is just too dangerous/volatile/flammable/explosive!! Bad, bad accident - waiting to happen...
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Post by leo on Jan 23, 2013 6:36:46 GMT -5
i would use WD-40 with straw sprayers.
position the engine so the fluid will run out and spray the crap out of it.
use a bowl to catch the runoff, strain the crud out of it, then you can use the fluid to clean other parts.
i suppose kerosene will work too.
gasoline is a dangerous substance because it is easily ignited.
another tip in this regard:
don't keep oily greasy rags laying around, throw them away or wash them.
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Post by duosport on Jan 23, 2013 8:46:01 GMT -5
Just curious. How flammable is carburetor cleaner?
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Post by tvnacman on Jan 23, 2013 10:16:51 GMT -5
Get a half gallon of diesel.
John
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Post by duosport on Jan 23, 2013 10:23:37 GMT -5
Get a half gallon of diesel. John For sure. Its not as easy to ignite and it is oily. |
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Post by Fox on Jan 23, 2013 10:59:35 GMT -5
Again, I use water because it's cheap and I know for a fact that water won't hurt anything in there. All you have is some aluminum and steel. After it dries you can spray the whole thing with WD40 if you are worried about it.
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Post by duosport on Jan 23, 2013 12:00:24 GMT -5
Again, I use water because it's cheap and I know for a fact that water won't hurt anything in there. All you have is some aluminum and steel. After it dries you can spray the whole thing with WD40 if you are worried about it. Certainly spraying this way will be good for removing more small particles, but I would imagine metal bits could be emerced in sludge that water would not disolve. |
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Post by Fox on Jan 23, 2013 14:24:23 GMT -5
There really shouldn't be any sludge in there. The only thing that moves through there is the fuel and oil mix. You just have to get all the big chunks out. Any microscopic bits that may remain will get taken care of by running the engine. They will get blown out the exhaust. You have the crank, the two main bearings and the lower connecting rod bearing. That's all that's in there.  |
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Post by duosport on Jan 23, 2013 19:34:03 GMT -5
I took a hone to the cylinder today and here is the results:  |
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Post by duosport on Jan 23, 2013 19:36:16 GMT -5
These scratches came out very nicely and the cylinder is within service specs so time to order the piston, rings etc.  |
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