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Piston ring problems

I have a brand new Mahle P/C set.
During the preassembly of the engine for checking valve to piston clearense I discovered some bad marks at the barrels.
After some investigation we found out the middle ring made those black stripes.
The edge of the ring have some roughness who you can feel with the fingers.
Have been in touch with Mahle and they don't of this problem.
The have never heard of those problems before.
All the six rings are the same.
The ring gap is 0,35mm.
Has anyone had such problems?




Old 10-01-2016, 07:34 AM
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Macro picture of the rings? Just curious what they look like where the roughness is.
Old 10-01-2016, 08:33 AM
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Originally Posted by pampadori View Post
Macro picture of the rings? Just curious what they look like where the roughness is.
I will try to take some macro pictures
Old 10-01-2016, 09:06 AM
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Did you file the ring gaps? I recently found that the 2nd ring on a set of JE rings developed a noticeable burr when I used my piston ring grinder and I had to dress each one with a small file to remove the sharp edges. The 2nd ring was much worse than the top rings.
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Old 10-01-2016, 05:13 PM
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Quote:
Originally Posted by RedCoupe View Post
Did you file the ring gaps? I recently found that the 2nd ring on a set of JE rings developed a noticeable burr when I used my piston ring grinder and I had to dress each one with a small file to remove the sharp edges. The 2nd ring was much worse than the top rings.
No, I havenīt file the gap.
I will order a new set first to compare.
Have some thoughts about to try to use 1200 sandpaper

Last edited by VW 612 RS; 10-02-2016 at 07:22 AM..
Old 10-02-2016, 07:20 AM
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Are these nikasil /6 cylinders?
I seen these marks when new, but nikasil is hard as hell so as long as it's not deep (as in you can't feel them) it's OK and normal.
Nikasil is way harder than the rings.

Of course check to be sure.
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Old 10-03-2016, 09:05 AM
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ok il ask the question as i just don't know ..
when they sold you the p/c set did they provide the rings also or are they from a different provider. ? were they shipped to you assembled or did you do all that yourself ?
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Old 10-03-2016, 10:09 AM
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Originally Posted by Mark Henry View Post
Are these nikasil /6 cylinders?
I seen these marks when new, but nikasil is hard as hell so as long as it's not deep (as in you can't feel them) it's OK and normal.
Nikasil is way harder than the rings.

Of course check to be sure.
Those marks came after the pre assembly.
Old 10-03-2016, 02:38 PM
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Quote:
Originally Posted by theiceman View Post
ok il ask the question as i just don't know ..
when they sold you the p/c set did they provide the rings also or are they from a different provider. ? were they shipped to you assembled or did you do all that yourself ?
I guess the ring comes from another provider.
The rings came beside the piston in a plastic bag.
I did the ring assembly.
But I have bought Mahle P/C earlier where the ring where assembled.
I have a dialog with Mahle to figure out what we do next.
Old 10-03-2016, 02:44 PM
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Just fyi my Mahle P&C came with rings assembled on pistons allready.....
Old 10-04-2016, 05:49 AM
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My Mahle's were pistons only and they came with the rings installed.
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Old 10-04-2016, 07:24 AM
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