No, but...
I only got about 25hrs on my A1A before having to overhaul it ( http://www.vansairforce.com/communit...ad.php?t=60675), but in the process I learned there is an AD on the oil pump requiring replacement of the aluminum gear with a steel one due to the potential for excessive wear (mine had not been done). I don't know enough to say whether that not being done could affect oil pressure, but it might be worth checking.
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bill
RV7A QB kit -- sold and now flying in S. Africa
RV7 purchased flying
"A pilot just bides his time until his plane can take him away again, into the air"
-- Jake Grafton (Stephen Coonts, Flight of the Intruder)
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