Teflon sealing ring question

Duane said

Just finishing up a rebuild on my late 80,s 904.
I purchased a Teflon sealing ring kit from A&A trans and I have noticed that the thickness
Or the width of all the rings in the kit a significantly thinner that the metal ones I took out. Do I have the wrong year or is this normal for the Teflon ones to be thinner.
Cannot say that I recall seeing this before and the A&A catalog seems confusing.
The diameters look right, just not the width.
Can anyone shed some light.
Thanks

Duane

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Depending on what "significant" is it could be normal for teflon rings as the function they use to seal is a little different than steel rings.
Teflon rings rely on being "blown closed" by fluid instead of tension like piston rings.
If the tapered ends (scarf cut) seems to line up ok in the bore they go in it shouldn't be a problem.

If I may give you a hint from experience if I may.
I always bent the tips of the rings just a little to make sure the very tip didn't stick out and get cut off on assembly AND lube pack the ring grooves completely to keep the rings in place until they are in the bores they will be living in.
(just two hints to keep from having a pressure loss from a cut ring):D

I'll tell you an odd thing I found out about teflon rings a long time ago.
They wear the metal they are in contact with more than steel rings do.
Weird huh?