Whats the downside to the drive filling with oil?
Pressurising the beast and its seals?
Is there more frictional losses and heat?

Steve Izett

> On 4 Mar 2021, at 2:35 pm, Sboese sboese@uwyo.edu <flyrotary@lancaironline.net> wrote:
>
> 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