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From: "The Mallorys" <candtmallory@cebridge.net>
To: "'Rotary motors in aircraft'" <flyrotary@lancaironline.net>
References: <list-3522882@logan.com>
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Subject: RE: [FlyRotary] Re: Still low oil pressure
Date: Sun, 1 Mar 2009 22:19:29 -0600
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I am using a remote filter, and I did double check to make sure it was
plumbed the correct direction.  

Tracy, there did seem to be a lot less oil after the filter.  I could bypass
it and see what happens.  But I would have thought I would have gotten a lot
more oil flow out of the pump than just a little.  How much is the right
amount?

I have not tried using a different pressure sender.  I know the one I have
on the fuel works, I could swap them out and see.

My big worry, other than the obvious why don't I have pressure, is that I
may be damaging the engine or PSRU.  How much longer can I crank them over
with no lubrication?

I could start by disconnecting the line out from the pump, then blowing oil
back into the pump as Lynn and Tracy suggest.  Then crank the engine over
with the starter and see how much flow I have.  But what is the right amount
to let me know the pump is working?

Chris

-----Original Message-----
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net] On
Behalf Of Charlie England
Sent: Sunday, March 01, 2009 9:52 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Still low oil pressure

Where are you measuring pressure, & are you using a remote filter? FWIW, 
at least one person that was using a remote mounted filter got the 'in' 
& 'out' reversed. Some (most?) filters have check valves & won't pass 
oil in reverse.

Charlie

Tracy Crook wrote:
> Really hard to draw any conclusions without knowing what 'a little 
> flow' is. At cranking speed it should be enough to make a good sized 
> puddle on the floor in 3 - 5 seconds. Does your first paragraph imply 
> that there was more oil flow before the filter than after it? If true, 
> that is suspicious.
>
> If you still suspect priming as the problem, have you tried to force 
> some heavy weight oil (40 - 50 wt) back toward the pump with air 
> pressure? If there is any significant oil flow through the pump, it 
> ought to prime immediately unless it is a totally clapped out pump.
>
> BTW, are you sure your oil pressure reading was accurate and not just 
> an instrument problem?
>
> Tracy
>
> On Sun, Mar 1, 2009 at 7:58 PM, The Mallorys 
> <candtmallory@cebridge.net <mailto:candtmallory@cebridge.net>> wrote:
>
>     No luck today.
>
>     I filled the line out of the engine just after the pump, then
>     cranked it over with the starter. I did get a little flow, but not
>     very much. I reconnected the hose, and added components as I went,
>     checking that I had oil flow after each. Still had flow after the
>     cooler and just barely a trickle after the filter, where the oil
>     should go back into the engine. From this I am thinking either I
>     am not picking up enough oil, or the pump isn't pumping enough oil.
>
>     The only way I can think to eliminate the oil pickup as a problem
>     is to drop the pan, and feed directly into the engine from a
>     container. This will be a little bit of a pain, as I will have to
>     remove the radiator, drain the pan, then remove it.
>
>     I don't know how to check the pump. Any ideas or suggestions? Is
>     there a way to check it without removing the rear eccentric shaft
>     bolt? It was a royal pain to remove last time, and I really don't
>     want to have to remove it again if there is another way to check
>     that the pump is pumping.
>
>     I am not using the apex seal oil pump. All I did was cap off the
>     hole on the outside of the block, and left all the internal parts.
>     I don't think this should make a difference, but thought I would
>     mention it in case.
>
>     Chris
>


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