First let me introduce myself. I'm a new member from central FL. Just getting back to my favorite hobby, haven't flown since 1981 or so.
I picked up a used Enya .45 6001 BB. that is missing one of the two rings. It feels like it has pretty good compression with the one ring. My question is whether to replace both of the rings as a set, or just the missing one? Also is it necessary to put a fresh cross hatch in the cylinder? If so how should it be done? Is using a brake cylinder hone very gently a bad idea or would a piece of emery paper be better?
Thank you very much for your advise
Mike
>First let me introduce myself. I'm a new member from central
>FL. Just getting back to my favorite hobby, haven't flown
>since 1981 or so.
>I picked up a used Enya .45 6001 BB. that is missing one of
>the two rings. It feels like it has pretty good compression
>with the one ring. My question is whether to replace both of
>the rings as a set, or just the missing one? Also is it
>necessary to put a fresh cross hatch in the cylinder? If so
>how should it be done? Is using a brake cylinder hone very
>gently a bad idea or would a piece of emery paper be better?
>
>Thank you very much for your advise
>Mike
Ron B.
F4Fguy
Mike,
Your question raises others. Why is one ring missing? Did the original owner break one at installation in trying to replace them, or did he deliberately remove one? Which one remains? Are you sure it had two rings? Some pistons have an "oil groove" in the top land.
In any case its not a great idea to leave one old and install one new. Replace them as a set.
As to "glaze busting", the new rings will seat just fine on the existing bore. Just run plenty of oil until you see a polished band developing at the top of the top ring.
If a brake cylinder hone is the only hone available, and unless you're extremely skilled at using it, you're likely to do more damage than good unless there's huge wear in the ring hook area of the cylinder. If so, you'll have to decide whether to replace it or take it to a shop with a "Sunnen", or equivalent honing machine where you can accurately control size and shape. Also, if the original pattern is completely gone, the cylinder is worn out anyway. If you remove enough material to re-establish finish and shape, you'll then have to resize the piston.
If you still feel the need to "break the glaze", wrap a piece of "Scotch-brite" around the brake hone, oil it up with Marvel oil,and run it through lightly just until the surface gunk is gone.
All in all, you'll be fine just replacing the ring pack, and running it.
Ron B.
>>First let me introduce myself. I'm a new member from
>central
>>FL. Just getting back to my favorite hobby, haven't flown
>>since 1981 or so.
>>I picked up a used Enya .45 6001 BB. that is missing one
>of
>>the two rings. It feels like it has pretty good
>compression
>>with the one ring. My question is whether to replace both
>of
>>the rings as a set, or just the missing one? Also is it
>>necessary to put a fresh cross hatch in the cylinder? If
>so
>>how should it be done? Is using a brake cylinder hone
>very
>>gently a bad idea or would a piece of emery paper be
>better?
>>
>>Thank you very much for your advise
>>Mike
>
>
>Ron B.
>F4Fguy
>
>Mike,
>
>Your question raises others. Why is one ring missing? Did the
>original owner break one at installation in trying to replace
>them, or did he deliberately remove one? Which one remains?
>Are you sure it had two rings? Some pistons have an "oil
>groove" in the top land.
>
>In any case its not a great idea to leave one old and install
>one new. Replace them as a set.
>
>As to "glaze busting", the new rings will seat just
>fine on the existing bore. Just run plenty of oil until you
>see a polished band developing at the top of the top ring.
>
>If a brake cylinder hone is the only hone available, and
>unless you're extremely skilled at using it, you're likely to
>do more damage than good unless there's huge wear in the ring
>hook area of the cylinder. If so, you'll have to decide
>whether to replace it or take it to a shop with a
>"Sunnen", or equivalent honing machine where you can
>accurately control size and shape. Also, if the original
>pattern is completely gone, the cylinder is worn out anyway.
>If you remove enough material to re-establish finish and
>shape, you'll then have to resize the piston.
>
>If you still feel the need to "break the glaze",
>wrap a piece of "Scotch-brite" around the brake
>hone, oil it up with Marvel oil,and run it through lightly
>just until the surface gunk is gone.
>
>All in all, you'll be fine just replacing the ring pack, and
>running it.
>
>Ron B.
Thanks Ron, I can see the original cross hatch all up and down the cylinder, and from what I read on this forum, this engine does have two rings, so I'll take your advice and just replace both rings, no honing, and run with lots of oil.
If you see the cross hatch, its good. Frank Bowman is known as the Lord of Rings. He's registered on this Forum and Stunthanger.
Gary T