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Thank You all for the replies; at least I know FlyRotary still has a pulse. I can no longer access the <flyrotary@lancaironline.net> website directly, but I get The Digest which is a collection of all correspondence from the previous day; not great but better than nothing.
I don't think ethanol in the gasoline plays much of a role inside the reduction drive and I'm using Hi-Test unleaded, which last time I checked has zero ethanol in it up here in the Great White North. The O-Ring is the original one spec'd and installed by Tracy (Real World Solutions). I found a source (Sterling Seal and Supply) via Amazon for a 351 Buna/Nitrile Rubber O-Ring, spec'd for fuel and oil with a temperature rating of -30F to 250F; Nitrile Rubber without Buna is sepc'd to only 212F.
This morning, I found the leak by slightly pressurizing the redrive with air; using soap and water it was easy to see it leaking around the cap screws that hold the Ring gear in place. I removed the drive and after disassembly on the bench, I found that all 8 of those cap screws were loose as a goose. I'm going to buy a small pipe cleaner and using lacquer thinner will clean up the threads and then I'll apply some Loctite before reassembly.
Jeff Whaley
260 hrs: 13B NA, RD-1C
-----Original Message-----
From: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Wednesday, July 23, 2025 6:01 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: flyrotary Digest #5478
Rotary motors in aircraft Digest #5478
1) RD-1C Oil Leak and Ring Gear Retainer O-Ring
by "Jeff Whaley jwhaley@datacast.com" <flyrotary@lancaironline.net>
2) Re: RD-1C Oil Leak and Ring Gear Retainer O-Ring
by "David COOK hoursaway1@comcast.net" <flyrotary@lancaironline.net>
3) Re: RD-1C Oil Leak and Ring Gear Retainer O-Ring
by "David Walker drw.aa@hotmail.com" <flyrotary@lancaironline.net>
4) Re: RD-1C Oil Leak and Ring Gear Retainer O-Ring
by "David COOK hoursaway1@comcast.net" <flyrotary@lancaironline.net>
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-----Original Message-----
From: Jeff Whaley
Sent: Tuesday, July 22, 2025 7:32 AM
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: RD-1C Oil Leak and Ring Gear Retainer O-Ring
I have an oil leak at my RD-1C redrive.
Took the drive off and noticed the large O-Ring was bulged out in one area between two mounting bolts.
The RD-1C Manual/Parts List specs the O-Ring as 5.125" O.D. x .190" thick.
Has anyone ever replaced this before and/or have a known source of where to obtain?
Thanks for any feedback.
Jeff Whaley
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