From: Rotary motors in aircraft=20 [flyrotary@lancaironline.net] on behalf of Kelly Troyer=20 [keltro@att.net]
Sent: Monday, February 15, 2010 2:11=20 PM
To: Rotary motors in aircraft
Subject: = [FlyRotary] Re:=20 PSRU oiling question

Chris,

Not Tracy but prop shaft main bearing is a sealed bearing = not=20 lubed by engine oil.........The

other bearing of the prop shaft is a sleeve (plain) type and is = lubed at=20 engine oil pressure....

The planetary gears also are lubed from engine oil=20 pressure..............

--
Kelly Troyer
"Dyke = Delta"_13B=20 ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil = Manifold=20

--------------=20 Original message from Chris Barber = <cbarber@texasattorney.net>:=20 --------------

I just received my PSRU back = from=20 Tracy. If I understand his explanation correctly my prop shaft = bearing=20 at the end near the prop (pusher) bound up somehow. He = machined=20 it, made other needed adjustments (?) and sent it back to me very=20 promptly...bout a week turn around (of course I dropped a bit on=20 overnight shipping to make sure he got it before he was = off=20 again <g>).

The problem may have been due to a couple of factors....not = really=20 sure, but I discovered it after my plane was sitting out of the = hangar due=20 to roof repairs for about 6 or 7 weeks. When I went up to = start it to=20 taxi back to the hangar, I pulled the prop through a few times by = hand and=20 all seemed fine. I started it up, started, was tickled, but=20 it it stalled. Did I mention it was REALLY = cold for=20 Houston...about 27 degrees. I started it again and is sounded=20 "labored" and was running poorly. It was about 1:00 am (I had = just=20 gotten off duty), so I figured I call it a night. I got out = and turned=20 the prop through again and could barely turn the prop. Damn. I = thought=20 I toasted another engine. Damn.

A couple of days later a friend and I pushed the plane back to = the=20 hangar and I walked away from the issue for a couple of weeks. Went = so far=20 as to even looking at financing a Lyc =20 <shudder>. I distracted myself by doing some interior = work and=20 wiring...actually got my radios far enough along to listen=20 to ATIS for a few minutes...on the bench.

Finally, two days after my recent loss, I forced myself to the = hangar=20 and pulled the PSRU . I had already looked inside = the=20 exhaust ports and the chambers looked clean and smooth. I had = also=20 drained the oil, with a magnet (I know, some is aluminum) in the = drain=20 filter and found it all to be perfectly clean. Well, without=20 the PSRU the engine turned perfectly making that = sweet=20 churning sound through the open spark plug holes.

I turned to the PSRU . I took = out each=20 section slooooowly . No signs of binding, = chipping or any=20 other damage in each part....until I got to the last section, the = sealed=20 section by the prop. The prop hub would not turn. I = could barely=20 turn it with the prop on. Without the prop is was a no go. So, = I sent=20 it to Tracy.

ANYWAY, now that I have it back mounted on the bird I am = curious as to=20 the oil going into the system. Even though I went through = this=20 long explanation, I only have a questions about the oil = entering the=20 PSRU . There is no reason to suspect any oiling = issues=20 caused the previous problem...I just like to share on = occasion. =20 However, last night when I was hooking up everything I = decided=20 to pour some oil directly into the in oil hole on top of = the=20 PSRU . My curiosity is that it=20 just kinda set there and very slowly seemed to = seep into=20 the PSRU . Does oil pressure forced it into the=20 PSRU , thus getting more oil in. I would think=20 with everything spinning etc under power the oil flow = etc would=20 be much more dynamic, thus providing a more significant lubricating=20 event. I don't really know what I was expecting. my oil = flow=20 seems good. It just got me thinking and wanting to have a = better=20 understanding. TIA

All the best,

Chris

Houston,=20 GSOT