flyrotary@lancaironline.net Mailing List Archive

Al, Sounds like you are looking at the brass "sleeve" bearing around the prop shaft. Should, of course,have an opening for the oil. If this PSRU was run on the dyno it sounds that like either:

1. This condition existed before the dyno runs (could be a missed step in manufacturing) or

2. The sleeve has sheared its pins and spun in the casting.

Ed Anderson
RV-6A N494BW Rotary Powered
Matthews, NC

----- Original Message -----

From: Al Gietzen

To: Rotary motors in aircraft

Sent: Sunday, August 29, 2004 5:36 PM

Subject: [FlyRotary] Re: Engine run - Good news/bad news

Subject: [FlyRotary] Re: Engine run - Good news/bad news

Took the fitting out; soaked out the oil. Shining a light in reveals a nice smooth surface of brass seated tight to the casting. No place for the oil to go.

Al

Al, check for foreign debris in the inlet too.

Dave Leonard

2. The joy was short-lived because it was only a one minute run while I had the redrive drain line disconnected. Taking the drain line off gave the first clue. No sign that a drop of oil had ever been there. The amount of oil in the container after the run – zippo; not a drop. I took off the feed line and there was oil sitting in the fitting. Feeding to a container, I ran again for less than 30 seconds, and sent more than a pint into the container. Complete blockage inside the drive. The prospect of removing the prop, drive and disassembly is not a happy one.

Al, something you might try before taking the gearbox off (a pain to say the least). Its been know for such stuff as the silicon grey sealant to plug up the drains. Yes, unlikely that it would have plugged up the front one. But, short of taking off the gear box you might try removing the drain fittings - just in the remote chance they could be plugged.

Ed

With two exits and 100 psi oil; my guess is it’s highly unlikely that the explanation is ‘foreign matter’. I think there is no oil going into the drive. It appears to me from the diagram that the oil goes in through a bushing via a hole and/or groove. Most likely a misalignment there giving the oil nowhere to go. I’ll check further later today.

Al