Steve,

The oil flow rate of the front drain of my drives was about 1/4 oz/min whereas the total from both drains was about 90 oz/min.  So I did not enlarge the front drain.  The rear drain was enlarged to 1/2” npt through the aluminum ring.  

See archived message 64583 of January 13, 2019 with a photo of the modification.

Steve Boese

> On May 23, 2021, at 10:13 PM, Stephen Izett stephen.izett@gmail.com <flyrotary@lancaironline.net> wrote:
>
>  Thanks Steve B.
>
> Did the two drains of Tracy’s drive need to be enlarged in order to upgrade to your recommended line size or are they already large enough and require only larger fittings?
> My drain lines are rubber and I thought I might replace them during some maintenance, and then add the breather when I next need to pull the drive.
>
> Thanks.
>
> Steve Izett