The ceramics are one piece. Kind of brownish in color and very light. They will probably have two springs under each one. Carbons are also one piece, but bluish grey in color. A bit heavier than the ceramics, one have one spring.
The ceramics are the gold standard of seals. Stronger than any steel seal and nearly no wear on the chrome. I would leave them in.
Lynn E. Hanover
Lynn—
I have a 13B NA which has previously been converted to propane by Rotary International Enterprises (?) and has to be reconverted to mogas/avgas. It allegedly has 17 hours of runtime on it and also was claimed to have been rebuilt using "ceramic seals". When we do a tear down on it for inspection, at the risk of sounding totally naïve, how do we ascertain that it truly does have ceramic seals on it and would you recommend that we simply just go ahead and replace them with more traditional seals regardless? (Comments from not only you but also anyone else would be greatly appreciated.)
Paul Vermillion
(partially completed BD-4)
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