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Finn,
When I installed a vent in the top of my RD-1C drive it acted as an additional drain. The drive operated completely filled with oil until the size of the original rear drain was increased to an ID of ~5/8” (1/2” NPT pipe).
Steve Boese
On Mar 3, 2021, at 5:46 PM, Finn Lassen finn.lassen@verizon.net <flyrotary@lancaironline.net> wrote:
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Dang! I just bought two of the National 350909 (single-lip) seals.
I can see how I could add a retainer, but don't see enough space in the 1/2" plate for an o-ring.
I added a vent to my RWS RD-1C drive, so internal pressure should not be an issue (unless vent line gets clogged).
Finn
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