Numbnuts ring question
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Numbnuts ring question
I have a Sealed Power moly ring set. One compression ring is dull black on the face, the other is bright white on the face. Which is the number one ring?
Re: Numbnuts ring question
The noticably darker, or what you are calling the "black ring" is the scraper or wiper ring. It is the second
ring on the piston.
The shiny ring, or what you are calling the "white ring" is the moly-faced ring. It is the top ring on the piston.
It is the compression ring.
Both rings should have dots on them. This indicates the upside of the ring, facing away from the piston
skirt. Looking down past the piston crown you should see the dots on both rings if they're installed properly.
Otherwise they're on upside down. To be clear; dot up away from the crank facing the cylinder head regardless
of which ring the dot is on.
The scraper/wiper "black" ring has a bevel on it. It faces the oil control ring; so it faces down away from the cylinder
head. The dot on the ring will be opposite of the bevel. The dot always faces up toward the piston crown.
Contrary to popular misconception, there is only the one compression ring. The top one.
The second ring is not a compression ring and if the top compression ring fails, the second one isn't far behind.
Usually there are instructions given with new ring sets. Ring sets also have part numbers per application.
ring on the piston.
The shiny ring, or what you are calling the "white ring" is the moly-faced ring. It is the top ring on the piston.
It is the compression ring.
Both rings should have dots on them. This indicates the upside of the ring, facing away from the piston
skirt. Looking down past the piston crown you should see the dots on both rings if they're installed properly.
Otherwise they're on upside down. To be clear; dot up away from the crank facing the cylinder head regardless
of which ring the dot is on.
The scraper/wiper "black" ring has a bevel on it. It faces the oil control ring; so it faces down away from the cylinder
head. The dot on the ring will be opposite of the bevel. The dot always faces up toward the piston crown.
Contrary to popular misconception, there is only the one compression ring. The top one.
The second ring is not a compression ring and if the top compression ring fails, the second one isn't far behind.
Usually there are instructions given with new ring sets. Ring sets also have part numbers per application.