I picked up a Jonsered 590 awhile back. I decided to go through it 100% because I plan on using it quite a bit. It's basically a Partner 500/5000 series. It's a closed port 51cc. I finally got the last of the parts in that I needed to finish it. It really cleaned up nice under the massive amounts of crud that was on it.
I'll be posting pics probably over the next day or so.
The bearings and case gasket checked out fine, so I did not split the case. The one seal had a very tiny air leak, so I replaced both seals.
Removing the seal
The seal is out
New seal in place
Other new seal in place
Worm gear in place
New oil pick ups
This shows how the pump works, the pickup with the screen fits into the tank, and the other goes up towards the oil hole.
The pump is in place
I'll be posting pics probably over the next day or so.
The bearings and case gasket checked out fine, so I did not split the case. The one seal had a very tiny air leak, so I replaced both seals.
Removing the seal
The seal is out
New seal in place
Other new seal in place
Worm gear in place
New oil pick ups
This shows how the pump works, the pickup with the screen fits into the tank, and the other goes up towards the oil hole.
The pump is in place
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Depending what my compression ends up at, I may end up milling the cylinder or case.
LOL 
