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Message-ID: <41E7309A.7010502@earthlink.net>
Date: Thu, 13 Jan 2005 20:38:18 -0600
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Oil Metering Pump... again
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Ok,.. I rec'd a pair of electric oil metering pumps in the other day and 
set about to cleaning them. Since as of this moment I have NOT closed 
the front cover on Engine #1 (overtorqued the engine oil pump bolts and 
had to extract them) I decided to look at things again.
 
Originally I had thought that the lil hole on the front cover mounting 
pad next to the OMP driveshaft was an oil feed. Upon closer look it 
appears that it is an oil DRAIN and that oil is fed to the OMP along the 
periphery of the drive shaft/passage. Interesting. I disassembled the 
electric doo-hickeys from the OMP and it appears that they are a pair of 
actuators - one to push and the other to return - to apparently control 
oil flow.
 
Since I have NOT closed the front cover, I would like to leave the oil 
gallery to this point open and not have to rely on splash lube of the 
OMP drive shaft. I intend to purchase the adapter from the vendor listed 
on Tracy's site to feed 2 cycle oil to the OMP and so any excess flow 
from the engine oil pump into the gallery will simply end up in the pan. 
(at least thats what I am thinking).
 
What is the procedure for controlling the electric actuators on the OMP. 
In the absence of a VERY simple solution, I would like to entertain the 
possibility of placing an insert in the "actuator chamber" to hold the 
round "actuator plate" in a high flow position (the equivalent of 
"wiring it open"). Who has the skinny on the electric OMP and what would 
be the best course of action if I choose to actually utilize these pumps.
 
By the way, break in/initial startup would be with premix and not depend 
on the OMP.
 
Dave Staten