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Well, I haven't heard of this happening before -- I
was ground running my engine to tune it with the EM-2 and EC-2. Ran
for almost an hour, at various rpm's to change the manifold pressure and tweak
the settings. Cooling working well, I had the top cowling off to allow good exit
area since I was tied down. Coolant pressure about 14 psi as reported on the
EM-2.
Engine was running good, took it up to ~6000 rpm
swinging a 76x76 Catto prop, when suddenly there was steam and fluid on my
windshield. Shut it down by killing power to the EC-2. Coolant
everywhere.
Got out and looked to diagnose the problem -- NOT
my plumbing. A FREEZE PLUG in the iron housing had blown out. Rapid
coolant dump.
Secondary effect -- Since I shut down suddenly from
full tilt, either the proximity of the cowl to the exhaust, or possibly some of
the coolant on the exhaust started a small fire on my cowl. Put it out with
extinguisher, but corner is charred.
Bill Schertz
KIS Cruiser
#4045
N343BS
Now in repair mode.
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