snip

  2) Add a static pressurization system like Paul has shown and
      rig up a ground accessible fitting, like in the oil filler door

area

      or air outlet area, or somewhere else accessible.  Using a
      REGULATED !!!!!  air supply, bring the system pressure up
      to rated + some safety factor with the engine cold and leave
      while you load fuel, baggage and preflight.  Look for coolant
      leaks with max cowling access for inspection, and loss of
      initial pressure over the preflight period.  Pressure loss or
     coolant leaks are an obvious 'no-go'.

Not a bad idea at all, but you have added another point of failure.

Also, I would be very leery of adding another point of failure on the
passenger side of the firewall as someone else said, that leak could obscure
your vision horribly and burn you as well.

Hans Conser

You misunderstood.  I want the pressure tap in the engine compartment
somewhere easily checked on preflight - not in the cockpit.

Bill Freeman

 
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