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I need instructions and parts list for a seized stihl MS170 as the shop says it is not worth repairing

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If it's seized, first off, take out the spark plug and pour a little diesel in it. You can get away with wd-40 too, but diesel works best. You'll want to let it sit this way for a couple of days. Next, you can try to tap the piston lightly with a plastic punch and a dead blow hammer. If it won't go, don't hit it too hard; you'll put a hole in it. If you haven't broken it loose by now, you may have to use the grease gun method. This is where you modify an old spark plug to attach to a grease fitting, screw it in, and pump it full of grease to use the hydraulic pressure to push the piston out. You'll want to unbolt the cylinder for this part. Once you get the piston out, look at the cylinder bore. If it's scored deeply, you'll want to get a new cylinder. If not, you can usually just hone it to get light scratches out, and put in a piston kit. As for cost effectiveness, your shop is right though. You can usually find a decent running used ms 170 for less than the parts you'll need to rebuild this one, especially if you're dealing with a seizure. If it seized due to oil mixture issues, you have no idea what kind of shape the rest of the bearings in the engine are in, and you're piston kit may be great, but you toast a bearing a week down the road. Piston kit runs about 30 dollars includes a piston, rings, wristpin, and clips, and you'll need a gasket kit as well. Another Option, is to find a shortblock, even used, and put rings in it just to play it safe. Hope this helps you out.

Posted on Apr 26, 2010

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