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Post by blythkd on Oct 25, 2020 21:08:52 GMT -5
I picked up my old 360 that hadn't ran for a few years. My son had been running it and said it quit on him. Found low compression right away so I pulled it down right quick to find this. Pretty much enough said.  360 piston by Brent Houk, on Flickr |
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Post by rowdy235 on Oct 25, 2020 22:02:16 GMT -5
Ouch, that pains me to see
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Post by edju1958 on Oct 25, 2020 22:06:30 GMT -5
Brent,what the hell happened to the piston & rings?Did he straight gas it?
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Post by blythkd on Oct 25, 2020 22:07:18 GMT -5
Yeah, and I can't really see what caused it. I went on a treasure hunt throughout the shop this morning and found enough NOS parts to fix it back up.
Edit: I don't think it was straight gas, that usually galls things up pretty bad all over the exhaust side of the piston. It's just got about 3 grooves where it smeared aluminum over the top of the rings. Doesn't really appear to be carbon either. Oh well, it'll have a new jug and piston shortly. I'll look everything over good while I'm in there to be sure i'm not missing something that could have gone through it.
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Post by fossil on Oct 26, 2020 16:58:39 GMT -5
Hard to see in the pic but the ring locating pin looks to be missing.
If it is, it sure isn't the first one. They come loose and exit.
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Post by blythkd on Oct 26, 2020 18:45:55 GMT -5
Well you got my curiosity up so I went back out in the cold and took a look. Both piston ring locating pins are still in place. I haven't found the culprit but upon further review, I did see that the piston has been beating on something for a while. Both the top of the piston and the head end of the cylinder were all peened up from something hard in between them. The spark plug looked fine so I'm guessing it must have ingested something through the top.
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Post by blythkd on Dec 7, 2020 7:35:07 GMT -5
Well I finally put my old dog back together the other day. I call it an old dog because several years ago I just threw together some parts and pieces of 2 or 3 old 350's and 360's and had a pretty good saw for a while.
I had been wondering what had gone down the side of the piston and stuck the rings. Upon further inspection, I found one end of the wrist pin was worn down pretty badly. I think some pieces of metal had spalled off the wrist pin and/or the needle bearing in the piston. It was pretty loose. This had also worked on the rod bearings as well. I thought the outer end of the rod worked side to side more than it should. So it got a new crankshaft, rod, bearings, piston/pin, cylinder, seals and rubber mounts.
It started up and ran fine but not quite as smooth as I expect so I need to take a little more time with the clutch and flywheel. I thought the clutch looked pretty good but I'll try a new one to see if that balances it out a little better. Can't imagine the flywheel being a problem but who knows? All in all, it runs pretty good and has good power, idles and throttles well. The old dog is back in business, although the innards certainly aren't old anymore!
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