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Voice from the past here... I would use a 50/50 mixture of acetone and ATF. It has worked well for me in the past when restoring old dirt bikes.
Ken Powell 501-847-4721
On 12/12/2025 4:43 PM CST Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
I'm finally getting around to getting my RV-3B with its 13B flying
again. Hasn't flown for 4 years or more.
I can turn the engine by hand but several of the apex seals are stuck --
won't move (back out) when pushing with a wood rod through leading
sparkplug holes.
What's the best to spray in there to loosen them up/? WD-40?
I'm reluctant to use carb or brake cleaner -- might they degrade the
rubber corner seals or maybe o-rings?
Finn
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