Ok, Dennis.  That small a hole should not make a significant difference then.  Just asked to make certain it was not the possible cause of the problem.  Actually more fluid (especially hot oil) through a 0.02 opening than you might think.  As I recall the old Ross Redrive had a restrictor of only 0.03 and that still provide sufficient oil for the redrive.  But your flow through the 0.02 would probably be on the order of a pint a minute or there abouts.  So compared to the 15 or so GPM of oil flow - it would be insignificant. 

I think an air bleed for anything in the oiling system should return to the sump.

 

I had to do that to an Accusump (accumulator) system to keep it working.  I used clear nylon tubing for the vent hose and was amazed by how much foam went flying through the tubing, that was collecting in the Accusump.

 

Lynn E. Hanover