Jump to content

L20b ring gaps


Recommended Posts

  • Replies 12
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

.015. I like them not dead on minimum. .009 is too close for a L20B.


Factory manual for an L20B top ring is .0098-.0157. That's .010-.016 on feeler blades.

2nd ring is .0118 to .0197, whoch is .011 to .020 on feeler blades.


Oil rings are .011-.035, BIG range there. But I set everything to .015. .015 blade goes in, .016 doesn't.

Link to comment

Also as a side note..

Make sure when you're compressing your rings

The oil-ring's don't jump the gap ! ( as in over-lap )

"Grant" brand rings purposely color one end of the control ring *Green* and the other ring end *Red* as a teller for this very purpose.

If it jumps .. likely that cylinder will eat oil like it's going out of style.

Link to comment

Black ring and bore facing edge painted/coated silverish white. Marked on one side with a N. What the hell is that all about?


Depending on the piston ring itself..

probably indicator of piston ring direction = "This side up/This side down"


grab the instruction's the piston ring's came with to verify :)


It takes me a while to check ring-gap then lightly grind down piston ring edges ( if gap is too tight )

then check again carefully ... and be satisfied at the same time lol.

quality piston-ring grinder is worth it's weight in gold is all I have to say.

Some old timers just use files ( I can't keep it straight enough when I've tried ).

  • Like 1
Link to comment

errrrrr that sucks.


I would advise stopping until you're 100% sure and seeing if you can research or look on a website/call someone.


my "assumption" is that if no other markings on the rings themselves ...


then N = "up"


But again I am assuming and assuming without fact is best to avoid when possible .


Some rings are literally marked "TOP" or "T" or ... how the manufacturer see's fit to mark the direction :unsure:



Hopefully the if you have some still in the package , and they haven't been touched take a quick look to see which way is up ( specifically the "N" marking ) ( piston rings should be in order per set and direction .. I think !? )

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...

Important Information

By using this site, you agree to our Terms of Use.