petegardner_901 Posted August 19, 2015 Report Share Posted August 19, 2015 Anyone with good ideas on how to remove carbon deposits without scratching the tops of the pistons? I was told a brass wire brush in a drill is good but it leaves severe scratch marks... Link to comment Share on other sites More sharing options...
JohnD Posted August 19, 2015 Report Share Posted August 19, 2015 I use an old chisel, 1" so that it doesn't dig the corners in. But a putty knife or paint scraper from a DiY would be fine. Just don't hold it at a high angle so it digs in. John Link to comment Share on other sites More sharing options...
Pete Lewis Posted August 19, 2015 Report Share Posted August 19, 2015 Best scraper I have for this is bone handled dinner knife, which had a blade snap many years ago Its just one of those odd bits of kit that works nicely, Stanley and razor blade scrapers dig into soft metals after scraping use some thick oil in the bores and turn the crankslowly to drag any debris from down the bores old idea was to use an old ring to keep the ring of carbon around the edge of the crown, ive never found that worthwhile Link to comment Share on other sites More sharing options...
Colin Lindsay Posted August 20, 2015 Report Share Posted August 20, 2015 As John says a blunt paint scraper is better than a razor scraper. Keep a petrol-soaked rag handy to wipe the debris out of the bores. A soft kitchen scourer - not metal - soaked in oil also cleans them well. Link to comment Share on other sites More sharing options...
Leon Posted August 25, 2015 Report Share Posted August 25, 2015 i have a brass blade in a scraper set that works a treat. just a bit of time and care is needed not to scratch the piston crown. i find it harder keeping carbon from dropping down to the rings though than not scratching the piston. a nice little trick is to put the piton to be cleaned at the top and then pack round the piston with grease. after cleaning the crown you can back the piston dawn the bore leaving all the carbon that would have made it to the rings stuck in the greases at the top of the pots waiting to be removed. Link to comment Share on other sites More sharing options...
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