On Aug 22, 7:07*pm, 5Z wrote:
On Aug 22, 7:10*pm, Darryl Ramm wrote:

It might blow a gasket if filled all the way due to hot temperatures
and no expansion space. If it was altitude related leaving a larger
air bubble would make problems due to pressure differential at
altitude worse not better. Right?

That makes sense, but since I've refilled mine, leaving the air bubble
in there, it hasn't leaked. *Go figure.

-Tom

Tom, I was not disagreeing with your instructions, just the reasons
you gave for doing so. My understanding is the air bubble is critical
for fluid thermal expansion on the PZL since unlike some compasses
they have no form of pressure relief diaphragm etc.

Darryl