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Any Hints For Removing a Stuck Piston Ring

  • Thread starter Thread starter almarconi
  • Start date Start date
A

almarconi

Guest
Trying to remove the top piston ring from a piston and it won't budge. The bike sat for several years and there was some rust in the cylinders. I was able to free the other rings by soaking in mixture of kerosene and ATF. They were pretty rusty. Any tricks or tips for getting the top ring out. I am going to replace all the rings but would like to reuse the piston. I have several used pistons available but would prefer to use the original ones if possible. Any help would be appreciated.
 
Try heating the piston with a map torch a few times letting it cool ..Hose the piston down with PB Blaster when its warm .. The aluminum will (should) expand off the ring ... Dont melt the piston and BP blast can catch fire too....I've used a 'hot plate' too to do this too...
 
If the rings are stuck as bad as you say then the ring lands are probably no good and it would be better to replace the pistons as well.
 
Have you tried to clean gently round with a wire brush first then soaking in kero/plus gas (like you say) then you can gently tap with the plastic handle of a screw driver and work your way round till you find a bit that moves and just keep worrying at it till it springs, or you could try gentle heat and cooling a few cycles should produce results. plenty of penetrating fluid.
 
Find the end gap and hit it with a small screwdriver -break the ring Just keep tapping it
 
If your gonna do new rings, I would get it hot as i could with a propane torch and then drop it in a can of used motor oil for a while. Heat will crack the carbon loose and the oil will soak in and help lube it for removal.
 
Well, I finally got the rings loose. After soaking in the kerosene/ATF overnight, I boiled them in a pot of water for about 30 minutes. I was able to use a small screwdriver blade and a hammer to tap the rings apart. Once I got the ring moving I was able to remove it. There are a couple small scratches next to the ring land but I should be able to dress them with a scotch brite or a small file.
I appreciate all the suggestions. This is my first splitting the cases (replacing the transmission) motor overhaul and I am really enjoying it :D. I can see why it would cost a small fortune for a shop to perform this service. So many parts to clean, measure and re-clean. It is very time consuming.
 
Glad it worked out. My concern was that a gouge could occur on a ring land, hampering sealing and allowing blowby.
 
My concern was that a gouge could occur on a ring land, hampering sealing and allowing blowby.
Click to expand...

I have several used pistons that I can install if I can't smooth out the scratches. Was really trying to keep the original pistons in the bores.
 
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