teddan Posted August 27, 2012 Share Posted August 27, 2012 (edited) What was suppose not to happen, happen anyway. When I installing my piston something happened and it was a scratch from the bottom of the piston until the bottom piston ring. The scratch is not wide but you can feel it and see it very clear. How bad is this??? should I smooth it out a little bit with 700 sandpaper? It seems that the scratch is from the ring compression tool...in the tool it is a metal end and I tight it all around the piston it then just knocked it down a little bit with a wood hammer. http://biltema.se/sv/Bil---MC/Verktyg-och-Verkstadsutrustning/Motor/Kolvringskompressor-191330/ Sorry for no pic... Edited August 27, 2012 by teddan (see edit history) Quote Link to comment Share on other sites More sharing options...
mark newman Posted August 27, 2012 Share Posted August 27, 2012 it will be fine . Quote Link to comment Share on other sites More sharing options...
teddan Posted August 27, 2012 Author Share Posted August 27, 2012 sound great but i am not sure the pistons will not touch the cylinder walls i hope Quote Link to comment Share on other sites More sharing options...
mark newman Posted August 27, 2012 Share Posted August 27, 2012 lets hope not , then it would be a problem Quote Link to comment Share on other sites More sharing options...
hodge Posted August 27, 2012 Share Posted August 27, 2012 If the pistons are balanced correctly won't this put 1 piston out of balance and slightly lighter than the rest? Quote Link to comment Share on other sites More sharing options...
chrispot Posted August 28, 2012 Share Posted August 28, 2012 If the pistons are balanced correctly won't this put 1 piston out of balance and slightly lighter than the rest? if it has put it out of balance because of the scratch all you have to do is stratch the other 5. only joking i would have thought that if you used 700 to 1200 grit paper and a bit of wd40 to smooth down the scratch it will be ok, as for the balance it would have to be a big deep scratch to make any difference to the balance. regards chris Quote Link to comment Share on other sites More sharing options...
Ian C Posted August 28, 2012 Share Posted August 28, 2012 It's not near the combustion chamber so it won't cause hotspotting and detonation. It certainly shouldn't be contacting the cylinder walls, and the weight difference would be ludicrously negligible, I doubt you could measure it using normal weighing gear. Chris Wilson would be able to advise better than an armchair expert like me, but I reckon it'd be fine. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted August 28, 2012 Share Posted August 28, 2012 1200 wet and dry paper, remove the sharpness of the scratch removing bare minimum of material (just a few rubs), wash piston in solvent, oil liberally and refit. Unless it's a real gouge it should be OK. Photos would help.... Quote Link to comment Share on other sites More sharing options...
teddan Posted August 29, 2012 Author Share Posted August 29, 2012 Thanks Quote Link to comment Share on other sites More sharing options...
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