Re: Alum. drums
The reason steel rings spin with the drum is because they have a thicker width which creates a higher force radially and overcomes the frictionally force created by oil pressure pushing the seals against the groove sides. The teflon seals are narrower so the force balance keeps the seal stationary in the groove and slips on the id of the drum. The teflon has a fiberglas filler material and that is what wears into the aluminum bore. One thing to keep in mind is aluminum drum expands alot more than cast iron drum and the steel seals typically have a clasp in the gap of the seal. If the bore wears too much or the aluminum drum get too hot , the clasp could prevent the seal from growing to keep the seal in contact with the bore. That creates a huge leak. Recommend a scarf cut teflon seal, and just live with the wear.
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