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Date: Tue, 7 Mar 2006 18:43:46 -0700
From: Bob White <rlwhite@comcast.net>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Possible oil pressure problems
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Hi Bob,

Before starting my engine, I primed the pump by pouring oil into the
pump thru the hose connected to the outlet.  I also pre-filled
the oil cooler and the oil filter. I was able to get oil pressure by
running the starter for less than 30 seconds (as best as I can
remember).  I was actually surprised when I saw the oil pressure come
up so quickly.  I had the EC2 turned off so there was no danger of the
engine starting.

Bob W.


On Tue, 7 Mar 2006 19:54:41 -0500
"Ed Anderson" <eanderson@carolina.rr.com> wrote:

> Bob, here's my opinion (and that's all it is).
> 
> The oil is so much heavier than air that if there is even the smallest air leak, I don't think you will ever pull oil through the system using a vacuum.  Even if there is not a leak, I think the odds are you will end up pulling air bubbles through the oil rather than pulling oil up the tube and past the pump.  Plus, as you noted the pump has a small hole for spraying oil on the chain which could readily be your air leak.  I guess you could try putting a plug in the oil chain hole ( I personally would not stick anything in that hole myself - would not want it plugged {:>)).
> 
> What I would do, is to remove the chain from the oil pump.  Get my self a heavy duty electric drill and put a socket on it the size of the oil pump nut and spin that pump.  That is a traditional way to prime an oil pump.  Now, that would require you to take off the front cover of course.
> 
> FWIW
> 
> Ed
>   ----- Original Message ----- 
>   From: Bob Darrah 
>   To: Rotary motors in aircraft 
>   Sent: Tuesday, March 07, 2006 7:38 PM
>   Subject: [FlyRotary] Possible oil pressure problems
> 
> 
>   Help!
> 
>   Getting closer to engine start (3 months?).  Put oil in the pan and had a brilliant (???) idea.  If I pulled a vacuume on the output hose, over time I should be able to pull oil past the oil pump and prime the system.
>   Well, it didn't  work.  Couldn't hold a vacuum or pressure possibibly due to:
> 
>             1. Leakes in the system on the pressure side of the pump (that famouse O ring in the front cover?)
>             2. The mannor in which the oil pump chain is lubricated.
> 
>   If number 2 is the reason, I can keep going.  What is normal here?
> 
>   Bob Darrah
>   20B 
> 


-- 
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