weasel Posted December 31, 2013 Share Posted December 31, 2013 Hello what is the best way to remove a very bad gummed up piston ring ? I have a Supertigre G20/23 that I bought second hand & would not run properly due to little or no compression. So my job today was to remove the piston & liner these came out with quite a bit of oven heat, on inspection the piston ring is well stuck with what looks like castor oil. would more heat help remove it ? I/E the hot flame... I have just ordered a reproduction one from evil bay so will give it a try if any good.... Regards Weasel....... Quote Link to comment Share on other sites More sharing options...
Shaunie Posted December 31, 2013 Share Posted December 31, 2013 Two methods spring to mind:- Heat some light oil to a high temperature and plunge the piston in it. All the usual safety warnings apply ! Buy a can of automotive carburettor cleaner, spray some into a small jar and soak the piston in it. It evaporates quickly so the jar will need to be capped. Shaunie. Quote Link to comment Share on other sites More sharing options...
jrman Posted January 1, 2014 Share Posted January 1, 2014 Try Fairy Power Spray. It removes burnt on castor from silencers so it's worth a try. Quote Link to comment Share on other sites More sharing options...
Tony Richardson Posted January 1, 2014 Share Posted January 1, 2014 If you have an ultra sonic cleaner fill it wit fuel or better yet methyl hydrate and give it a good go with that, another solution is to warm some anti freeze in an old saucepan and let it simmer in that for a while (preferably outdoors or in the shed/garage however you do it take your time and just keep working at it with a stiff brush periodically do not force it on pain of breaking it 9ask me how I know that ) Good luck. Quote Link to comment Share on other sites More sharing options...
Ben Pettit Posted January 1, 2014 Share Posted January 1, 2014 As Shaunie said above, carb cleaner work wonders on gummed up engines, rings etc. I use it on my petrol engines after running in on mineral oil. cleans out all the carbon and black sludge before switching to synthetic oil. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted January 5, 2014 Share Posted January 5, 2014 +1 for Fairy Power Spray......give a good soaking, leave for a while & then a good scrub with a toothbrush (use your wifes but remember to put it back as soon as you've finished using it so she doesn't suspect anything). Rinse & things should be much better. Too much heat will simply bake the castor oil into place making things much harder. The ring should be freeer & much easier to remove. Clean out the ring groove thourougly too.....toothbrushes, wooden scrapers.....whatever it takes but take care not to damage the piston......a good polish of the piston outer surfaces with wadding polish is well worth it too....gets rid of the castor gum. When reassembling its probably a good idea to "deglaze" the liner.....either gently polish with some Autosol or similar metal polish or use some 1000-1200 grade wet & dry with a drop of oil on it & gently rub this all over the bore of the engine. Wash & clean the liner really well to ensure no traces of polish or wt & dry grit remain & the liner should be good to go. Quote Link to comment Share on other sites More sharing options...
cymaz Posted January 5, 2014 Share Posted January 5, 2014 +2 for Fairy Powerspray. Great stuff, don't leave it on for more than about half hour. Quote Link to comment Share on other sites More sharing options...
J V R Posted January 5, 2014 Share Posted January 5, 2014 +1 for the anti freeze, always works for me......... Quote Link to comment Share on other sites More sharing options...
david williams 9 ( whizzo) Posted January 5, 2014 Share Posted January 5, 2014 Hi weasel. An old method you could try is leave it to soak in vinegar. I have used this method on old car engines being a mild acid it wont damage the alloy. Quote Link to comment Share on other sites More sharing options...
Shaunie Posted January 5, 2014 Share Posted January 5, 2014 Then of course, there's always Coca Cola. Use the genuine stuff and not diet. I suspect it's the Phosphoric acid in it that is the active ingredient. Shaunie. Quote Link to comment Share on other sites More sharing options...
ascot Posted January 5, 2014 Share Posted January 5, 2014 Can anybody recommend a good after run oil ! Quote Link to comment Share on other sites More sharing options...
David Holland 2 Posted January 5, 2014 Share Posted January 5, 2014 Can't remember where I read it, but it was a reputable source, and being all electric I can't speak from experience, but it seems that ATF (auto transmission fluid) is a very good after- run oil. Don't take my word for it unless a noisey, oily person confirms it!! (Wish I knew how to do that smiley, satanic face thing) David Quote Link to comment Share on other sites More sharing options...
Martin Whybrow Posted January 5, 2014 Share Posted January 5, 2014 Model Technics after run oil is good stuff. Quote Link to comment Share on other sites More sharing options...
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