| Author | Message | ||
     Essmjay |
http://is.gd/v6TudY Link is to a Picassa web album with a couple of pictures of the front cylinder off Macy's '02 S3. I am trying to figure out if it is a casting defect. As you can see it is irregular and you can feel it with your fingernail. I used Picassa so the resolution would be good. I can't think of how the piston and rings could cause a indentation like this and I am thinking it might be better to replace than bore out .10 over. Opinions and comments appreciated. Shane | ||
| Sportyeric |
Never seen anything like that. Its definitely pooched. Can't help you with the part number. | ||
| Brother_in_buells |
I would replace it! have seen once a moto-guzzi cylinder with something similar (came from pre-ignition) | ||
| Preybird1 |
I have seen that once before.....It was on oldogs X1. He had to replace it. I don't trust harley parts and i only buy high end after market parts now. I only buy HD if i can't get it aftermarket. | ||
| Xl1200r |
It almost looks like it cracked and the rings just wore away at it. Is there anything suspicious looking on the outside of the cylinder? Which side of the front cylinder was that on? If it was the front side of the front cylinder, I think a crack could be likely given how these engines hang from the frame. (Message edited by xl1200r on March 15, 2011) | ||
| Maru |
Was the bike sitting for an extended period of time? | ||
| Essmjay |
Good questions. No sign of any cracking on the outside of the cylinder. The defect is in the left front quadrant of the front cylinder. There were no gasket leaks on this cylinder and the bike was running great. We bought the bike last summer, it is a 2002 and had only 7000 miles on it, so it had to of spent a fair amount of time just sitting. There doesn't seem to be a crack inside the defect, at least nothing you can see or catch with a fingernail or razor blade. It's more of a deep irregular groove. It is a different color also, kind of what I would see making candles many years ago. When you waited too long between pours you would get a different structure where the two pours came together. I wonder if the metal is somehow softer there and the rings wore away metal, exposing the structure of the softer zone. | ||
| Terrycoxusa |
Magnafluxing might show a crack. At any rate, you will need to buy a new cylinder. | ||
| Xl1200r |
+1 Terry. Look for whatever you can physically. Spending money to see what happened would only serve your curiosity. | ||
| Terrycoxusa |
http://en.wikipedia.org/wiki/Dye_penetrant_inspect ion | ||
| Terrycoxusa |
http://en.wikipedia.org/wiki/Magnaflux | ||
| Essmjay |
Thanks for all the advice. New cylinders ordered. I agree it looks like a possible crack. I see the same look in stone when I am carving and find a crack in the stone. | ||
| The4ork |
my guess is during a period it sat for a while, and started corroding, undoubtedly the ring is a different metallic compound as the cylinder, which aids corrosion (aircraft have a lot of problems with this) and if moisture and static electricity are involved it greatly speeds up the process. even if in very small amounts. block heaters and battery trickle chargers are known to do this over time as plastic sheathing break down and de-insulate the wires. especially cheap ones. this is my best guess, and after running it the corrosion has been smoothened out by the rings which iirc of harder material than the cylinder. time for a 1250 kit |
