Chris,

I agree, it sounds most likely to be the front cover o-ring.  But
don't overlook the woodruff key in the oil pump.  It is very easy to
have this key fall out of place when installing the oil pump pulley.
If it falls out it will allow the pulley to slip on the pump shaft
resulting in low oil pressure... and eventual engine failure.  You can
check that it is in place with a piece of safety wire.

Mark S.

On 8/26/12, Chris Barber <cbarber@texasattorney.net> wrote:
> My oil pressure has dropped again. I am jumping to the conclusion it is that
> pesky front cover O-ring. I know I was meticulous with installing it last
> time. While it may be something else, I doubt it. I had the pressure valve
> fall into the pan a couple of years ago and it is now safety wired in.
> Perhaps it is the oil pump but it seems so simple and not prone to failure.
>
>
> So, to make this more than a vent, as I know mostly how to address
> this....contrary to the evidence that I am having to screw with it again, is
> there any words of wisdom y'all would care to share. Since I will at least
> have the front cover off (should be able to do do with engine on the plane)
> would this be a good time to replace the oil pump. It has not been replaced
> in the past do it is many years old with an unknown number of miles. Is
> there a "better" oil pump out there than the turbo version offered by
> Mazdatrix that I should ponder?
>
> I may have the oil ring and plastic retaining ring already if I can find
> them. Just gotta find the time to crack into it.  Then to continue my turbo
> diagnosis. Great power without intercooler (even though I found no
> restriction, but it is a super cheap intercooler from eBay) and blow off
> valve or even N/A. Obvious limited breathing with the cheap intercooler and
> blow off valve
>
> TIA.
>
> Chris Barber
> Houston
>
> Sent from my iPhone 4
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