I have removed pistons to install new rings, but find the old ones are stuck in their grooves, possibly by a combination of age and corrosion. The piston ring gap is closed and I have almost given up....there must be a way to remove these little darlings.
Can someone please show me the light.
Mike W
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Immerse in vinegar for a week. Not WD40
madf
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try heat/cooling the pistons in an over a couple of times - differential expansion might free them. Upend them in a bath of carbon remover for a day or two - that might help.
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Sorry, meant 'oven' not 'over'.
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are they proud of the piston at all ? If so, even a little bit, then gentle tap the ring. If its not proud, there may still be a little gap behind it so try and tap it in gently. That should push it in and push it out elsewhere. Repeat endlessly. That together with something such as WD40 or similar will eventually shift them.
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If the rings are that seized in, then by the time you've got them out, then tried to clean the groove to get some clearance for the new ones, you might as well buy new pistons.
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I have removed pistons to install new rings, but find the old ones are stuck in their grooves, possibly by a combination of age and corrosion. The piston ring gap is closed and I have almost given up....there must be a way to remove these little darlings.
The ring gap is closed? Completely? You could try putting the piston in the oven (as suggested previously), at Gas Mark 5 or equivalent (at which spit will bounce off metal). Then hold the piston in an oven glove and try tapping the skirt or centre of the crown lightly to see whether the rings open. N.B. Don't hit the lands or anywhere you're likely to compless metal onto the rings. Don't use force! Also, do this while the wife's out.
There's a possibility that there are lubrication holes which you can push a tool (amall allen key, for instance) into, and push from the inside.
Hold the piston carefully and tap the ring at a tangent (as near as possible) with a small drift (e.g. a nail punch) where you think the ring gap is.
You're likely to break the ring. Try not to damage the lands with your punch. Use the bits of broken ring to clean out the groove. Don't remove metal from the piston. Remember that the new rings may be fractionally thicker than the old.
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Yep been here but many years ago, has the engine been stood a couple of years or something. ?. Method 1. Heat them up in the over set to 120 degrees C and put each piston in for 10 minutes. This heats the piston more than the rings. Hold the piston with the ring gap in the palm of an oven glove or welders glove and tap the other side of the ring with a 10 to 12 inch length of of round wooden dowling. you will not harm anything and it may take quite a cloud to get the ring gap to open.
Method 2. invert the piston and fill with boiling water. empty, fill empty fill, empty the hold and tap the ring as above. This method heat the piston not the ring and often used to do the job. Last time I worked with seized rings was on a 1953 Morris Oxford column change, colour black. All other seized rings have been over heats and siezers where the pistons are oval anyway. Good Luck my friend. Regards Peter
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They're not cast iron pistons are they ?
A bit of a rarity I know, but they have been used.
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