SunStreaker Posted April 11, 2012 Report Share Posted April 11, 2012 (edited) It looks like its from the piston traveling up and down, should I be worried about it? http://i.imgur.com/VlJBO.jpghttp://i.imgur.com/WhtKQ.jpghttp://i.imgur.com/copUS.jpg Edited April 11, 2012 by SunStreaker Link to comment Share on other sites More sharing options...
Frenchi934 Posted April 11, 2012 Report Share Posted April 11, 2012 ive never seen anything like that in any of the engines ive ever had apart... Link to comment Share on other sites More sharing options...
ucw458 Posted April 11, 2012 Report Share Posted April 11, 2012 Someone probably put all the ring end gaps on the same side. Or you broke a ring. Either way it's bad. Those are my guesses. Link to comment Share on other sites More sharing options...
Frenchi934 Posted April 11, 2012 Report Share Posted April 11, 2012 Someone probably put all the ring end gaps on the same side. Or you broke a ring. Either way it's bad. Those are my guesses. thats sort of what i was thinking when i looked at it haha. Link to comment Share on other sites More sharing options...
SunStreaker Posted April 11, 2012 Author Report Share Posted April 11, 2012 Its not from the rings being aligned the same way with a gap because its smoother on that strip its almost like a mirror like polish up and down. No carbon build up just more polished than the rest like more contact or wear? And the engine was rebuilt, no carbon buildup anywhere. Everything is new and clean. Link to comment Share on other sites More sharing options...
Crazy larry Posted April 11, 2012 Report Share Posted April 11, 2012 pull the piston. Why is the engine tore down Link to comment Share on other sites More sharing options...
Crazy Quest Posted April 11, 2012 Report Share Posted April 11, 2012 In my opinion ifs definitely from a ring sitting in one spot causing that smooth patch to never get touched. Link to comment Share on other sites More sharing options...
mr-starion Posted April 11, 2012 Report Share Posted April 11, 2012 That definitley looks like a broken ring or something that was caught in between, ive seen that on a v8 once but the ring was missing a chunk... Link to comment Share on other sites More sharing options...
Komeuppance Posted April 11, 2012 Report Share Posted April 11, 2012 Broken ring land. -Robert Link to comment Share on other sites More sharing options...
Dad Posted April 11, 2012 Report Share Posted April 11, 2012 Something in the pin bore? Dad Link to comment Share on other sites More sharing options...
SunStreaker Posted April 11, 2012 Author Report Share Posted April 11, 2012 (edited) It seems like there is more contact in that area resulting in a polished surface. Can I pull just that one piston? What else would I need to do? The compression was fine across all cylinders. Edited April 11, 2012 by SunStreaker Link to comment Share on other sites More sharing options...
Shelby Posted April 11, 2012 Report Share Posted April 11, 2012 could be plug for floating wrist pins or broken ring land or wrist pin out of position and rubing on cyl wall no matter what it is the piston needs to come out Link to comment Share on other sites More sharing options...
SunStreaker Posted April 11, 2012 Author Report Share Posted April 11, 2012 Can I just pull 1 piston? Link to comment Share on other sites More sharing options...
Indiana Posted April 11, 2012 Report Share Posted April 11, 2012 Look for the spacer between the oil control rings to be over lapped. The ends are supposed to butt to each other but if not paying attention they end up overlapped and the control rings jamb then stick out and can cause that. Link to comment Share on other sites More sharing options...
Indiana Posted April 11, 2012 Report Share Posted April 11, 2012 Can I just pull 1 piston?of course Link to comment Share on other sites More sharing options...
SunStreaker Posted April 11, 2012 Author Report Share Posted April 11, 2012 Look for the spacer between the oil control rings to be over lapped. The ends are supposed to butt to each other but if not paying attention they end up overlapped and the control rings jamb then stick out and can cause that.If this is the problem what would the solution be? Link to comment Share on other sites More sharing options...
Frenchi934 Posted April 11, 2012 Report Share Posted April 11, 2012 hone the cylinder and put them back in (might get by with just a new set of rings on the one piston). If its scarred, you'll have to bore it out and replace the whole piston set. Link to comment Share on other sites More sharing options...
psu_Crash Posted April 12, 2012 Report Share Posted April 12, 2012 I had a stock engine look like that years ago, but it was on several cylinders. Mine was due to a crushed ring land. Link to comment Share on other sites More sharing options...
SunStreaker Posted April 12, 2012 Author Report Share Posted April 12, 2012 Took it apart and lined up s*** to take pics I don't know what irregularity is supposed to look like http://i.imgur.com/lt8ja.jpghttp://i.imgur.com/31mjS.jpghttp://i.imgur.com/ORDoa.jpghttp://i.imgur.com/N59nw.jpghttp://i.imgur.com/7EBRL.jpghttp://i.imgur.com/P2zPl.jpghttp://i.imgur.com/9cwv0.jpg Link to comment Share on other sites More sharing options...
Guest Posted April 12, 2012 Report Share Posted April 12, 2012 The rings gaps were lined up together. If thats how they piston rings came out when you pulled piston out. Link to comment Share on other sites More sharing options...
Shelby Posted April 12, 2012 Report Share Posted April 12, 2012 even if both ring gaps were togather the wear mark would not be that large,,check ring gap in cyl bore with out pistonis that a crack in the 2'd ring land between that ring and the oil ring land finding std rings on over size'd pistons is not uncommon Link to comment Share on other sites More sharing options...
Indiana Posted April 12, 2012 Report Share Posted April 12, 2012 (edited) That last picture shows detonation damage, those burned marks on the top of the piston are burnt away alloy. I'm guessing you said you lined the gaps up on purpose for the picture? Its possible that will hone back out but I'd put that piston in another hole and get a new set of rings and start over. I'd have all the cylinders honed again and use those cheap moly Hasting rings you can get off ebay for about $15.00. Those little lines cut around the diameter, those are supposed to reduce the possibility of detonation by dispersing the heat quicker. There's some burnt away and as that was just laying above that ring after it burnt off when it went up and down that's what caused this. I've seen this a few times. You'll see blown up motor pictures with similar markings. The good part is that was aluminum and that's not as bad as steel so just have it honed, get new rings and put it back together. Don't put any ring end gap there just to be safe. http://i.imgur.com/9cwv0.jpg Edited April 12, 2012 by Indiana Link to comment Share on other sites More sharing options...
SunStreaker Posted April 12, 2012 Author Report Share Posted April 12, 2012 Indian I did line up the rings for the picture. And detonation seems like a very good explanation because the previous owner of the engine has fuel issues that he said resulted of a kinked fuel hose. So to repair detonation damage, rehone shuffle the pistons? I also found a little copper fragment very tiny in the oil pan, and there was metal in the oil. The metal in the oil was very small like sparkles, probably from the pistons or the cylinder wall? Link to comment Share on other sites More sharing options...
ucw458 Posted April 12, 2012 Report Share Posted April 12, 2012 I also found a little copper fragment very tiny in the oil pan, and there was metal in the oil. The metal in the oil was very small like sparkles, probably from the pistons or the cylinder wall? Not what you want to hear but that could be from the engine bearings. Link to comment Share on other sites More sharing options...
SunStreaker Posted April 12, 2012 Author Report Share Posted April 12, 2012 Not what you want to hear but that could be from the engine bearings.I know, I currently have an engine with a spun bearing and there isnt as much metal in this one as the spun one. Link to comment Share on other sites More sharing options...
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