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Old 07-10-2019, 01:52 PM
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Piston Ring Installation

I have a set of Sealed Power piston rings - part #E-251K. I cannot find any markings to indicate which side of the rings go up. They appear to be completely symmetrical. Is there a top and bottom to these rings? How about the oil expander ring?

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Old 07-10-2019, 05:30 PM
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Is there a bevel around the inside edge of the rings??
If so, top ring bevel goes up.
Second ring bevel goes down, UNLESS second ting has a Napier hook face, then bevel goes up if present.

Oil rail rings have to top or bottom, they are barrel faced. Oil expander has no top or bottom either, just never overlap the ends, ends of the expander must be butted together.
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Old 07-12-2019, 06:52 AM
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After looking more closely, with a magnifying glass, I was able to find the faintest word "top" on the second ring. There is no marking on the top ring and it doesn't have a bevel but there is a radius on the ID on both top and bottom. Oil expander ring has a repetitious logo going all around one side. Nothing on the oil rail rings.
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Old 07-15-2019, 03:07 PM
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From the photo in my last post does anyone have an opinion on an up or down for this ring?
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Old 07-15-2019, 03:44 PM
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the top can go either way
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Old 07-15-2019, 05:17 PM
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Imsport is right, barrel faced ring can go either side up if it has o identifying mark or bevel.
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Old 07-18-2019, 09:47 AM
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I'm new to this so excuse me if I've gotten it wrong. One of 3 books I read to be over educated says that the ring with top on it should be the top compression ring on the piston. I just went through this with my Ford 302 install and couldn't find anything to determine which ring should be the top compression ring. I know the dot goes up but as far as I could determine nothing was different for the first and second compression ring. I hope I got it right!
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Old 07-19-2019, 07:52 AM
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John,

Here are some photos showing the packaging my rings came in which identified where they go. Another photo shows the word "Top" on the second ring. The last photo shows the difference in the ring edges. My rings have a coating on the compression ring which I think is the shinny surface which would confirm the designation on the packaging. Both rings have a gap of a little over .019". I'm trying to make damn sure I get it right too.
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Old 07-19-2019, 08:15 AM
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K part numbers are moly faced, the shiny ring is the top ring.
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Old 07-19-2019, 09:21 AM
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Appreciate the confirmation. I was beginning to wonder if the top and second rings could have been in the wrong compartment in the package.
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Old 07-21-2019, 08:17 AM
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Quote:
Originally Posted by Molon Labe View Post
John,

Here are some photos showing the packaging my rings came in which identified where they go. Another photo shows the word "Top" on the second ring. The last photo shows the difference in the ring edges. My rings have a coating on the compression ring which I think is the shinny surface which would confirm the designation on the packaging. Both rings have a gap of a little over .019". I'm trying to make damn sure I get it right too.
Thanks for that. My E-251K 30 ring set had no shiny ring and the two sets of compression rings looked exactly the same to the inexperienced eye. The package had 3 compartments. The larger compartment I had placed on the right and it had the oil rings which was pretty apparent. I assumed that the other compartments would be top rings on top and 2nd ring on the bottom. I hope I had the box right side up!!. It was according to the label on the end. I will pull a piston to confirm if I can't figure it out. These things can be dang confusing to a newbie.
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Old 07-21-2019, 08:20 AM
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Quote:
Originally Posted by lmsport View Post
K part numbers are moly faced, the shiny ring is the top ring.
It wasn't the case in my ring set but it was originally purchased many years ago so it might have been different then.
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Old 07-21-2019, 01:52 PM
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Quote:
Originally Posted by 46FordJohn View Post
It wasn't the case in my ring set but it was originally purchased many years ago so it might have been different then.
the K-set rings have been the moly faced option for at least 30 years.
the X-set rings use a plain face top ring and will look the same as the 2nd ring
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Old 07-21-2019, 02:18 PM
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Quote:
Originally Posted by lmsport View Post
the K-set rings have been the moly faced option for at least 30 years.
the X-set rings use a plain face top ring and will look the same as the 2nd ring
Mine are E-251K 30 which might make a difference? Top and 2nd ring look alike. They still don't have a shiny face on the top ring. Anyway they were purchased in '96 I believe.
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Old 07-21-2019, 03:00 PM
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Quote:
Originally Posted by 46FordJohn View Post
Mine are E-251K 30 which might make a difference? Top and 2nd ring look alike. They still don't have a shiny face on the top ring. Anyway they were purchased in '96 I believe.
Look close at the outside face of the ring, the face that rides on the cylinder wall. Older style moly face will appear as a lighter or medium gray color in the central area of the face with a skinny dark border edge at the top and bottom of the ring face. They machine a groove in the ring face, leaving just a very thin top and bottom edge, and them heat spray fill the moly into the groove in the ring face when they manufacture them.

Think of a fresh poured cement sidewalk, with the wood forms still on the sides as to the look. You can almost see it in Molon Labe's earlier post, just a little too out of focus, the ring closest to the tips of his fingers.

Being they had a "K" suffix, they should have been moly filled face top rings. The "30" is the designation for .030" oversize bore.
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