Mailing List flyrotary@lancaironline.net Message #19537
From: Ed Anderson <eanderson@carolina.rr.com>
Subject: Re: [FlyRotary] Re: Oil Flow
Date: Tue, 29 Mar 2005 07:42:46 -0500
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Good Point, Kelly.
 
Yes, the key is easy to push out of its slot when sliding the oil pump sprocket on the shaft.  Most of the time it will fall out and you can spot it.  In my case, it got trapped between the sprocket and oil pump housing and did not fall out.  In later examining the pump, you could see the impression in the softer aluminum pump housing where the torquing of the shaft nut had forced the key into the housing.  Flew for 10 hours with just the clamping force of the torque, until a inadvertent WOT start up on a cool morning with 50 weight oil broke the nuts clamping force loose.
 
I noticed while taxing to the far end of the runway at Tracy Crooks that the oil pressure was only 20 psi vs the normal 35-40 psi.  Thought it must surely be a pressure sensor or gauge problem. But, just couldn't bring myself to take-off, so taxied back and started test. First all the sensor and gauge.   But, all test indicated an internal problem, took the engine off, and while washing out the oil pan hear a "clink" of metal in the pan and found the beat-up oil pump shaft key lying there.  So it can happen.
 
Ed A
----- Original Message -----
Sent: Tuesday, March 29, 2005 4:50 AM
Subject: [FlyRotary] Re: Oil Flow

 
Wendell
Remember the problem Ed Anderson had.......When oil pump pulley was
installed the key was pushed out of the keyway and he was flying for a
period of time with just the friction of the taper between the oilpump shaft
and the pulley driveing the pump.......Something to consider......
--
Kelly Troyer
Dyke Delta/13B/RD1C/EC2




-------------- Original message from "Wendell Voto" <jwvoto@itlnet.net>: --------------

 
 
Subject: [FlyRotary] Re: Oil Flow

Got (some) oil flow.

Remove the pick-up tube and cleaned off Hylomar. Cut a new gasket out of some gasket stock I had lying around and installed pick-up tube without any sealant.

Hooked up starter (plugs removed) and spun engine, no joy. Removed outlet hose and primed pump again. Got oil flow. Reconnected oil line and left it slightly loose and had oil pressure gauge sender out. Cranked engine, oil flowed out of pressure sender hole. Let engine set while bat recharged some. Tried again, no oil.

Repeated priming and had oil flow, reconnected line and this time oil flow was good. Put oil pressure sender on and cranked engine, had oil flow. Let engine set several minutes, cranked again, had oil flow. Let set some more, no flow while cranking.

Racing beat catalog says to charge the oil line by cranking the engine without spark plugs installed as I did but got varying results, sometimes got oil pressure (couldn't measure it - use ohmmeter to see if sender saw any pressure) and some times I didn't. How fast does the engine have to go the get oil to suck up the pick-up tube quickly, or how long after starting the engine does oil pressure come up?

Ready to try a first start of the engine if oil pressure could be counted on to come up.

Perplexed as to why I get oil pressure sometimes and not every time I spin the engine.

Wendell (with oil all over the place)

 
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