John at Mazdatrix claims this is caused by a failed pressure
cap. Even in street cars. I am not so sure. It looks like
simple corrosion to me. In any event it would not hurt to
buy a pressure cap tester. Such a cheap device can be critical
to the cooling of your aircraft engine.

A pre flight cold cooling system pressure check using compressed air
would accomplish the same thing.

Paul Lamar

Hi again Paul,
The electrolis attack on the cooling system is caused by leakage in the
DC electrical system. If you check the other parts of this cooling
system you will also find that the cast iron will show some signs of
damage but very slight. The attack is on the sharp edge of the rotor and
not on the cast iron housing will be the proof. I would suggest make a
check of all DC components. If you take the earth of the battery and
check for any current between the lead and the battery terminal will
show the cause.
Regards don



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