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Home> Continental & Lycoming TroubleShoot
Cylinder head to barrel separation1. Missing or damaged cylinder baffling causing uneven air flow around cylinder barrel. This causes barrel to expand "egg- shaped" which results in cylinder head stress at the attachment point of the cylinder barrel to head. Reference Cessna Service Letter 64-32, Beech Service Letter 64-20, or Continental Service Bulletin M65-13. 2. Weakened cylinder head caused from welding of cylinder head. Editorial: Much emphasis is placed on cylinder head temperature but I believe, especially in the homebuilt arena, however, more awareness needs to be placed on:A. Cylinder barrel temperature B. Cylinder barrel temperature distribution 2. Fatigue cracking of cylinder head caused from old age.
 Lycoming
cylinder barrel with head removed to show joint. Think of the cylinder as a
pressure vessel where the pressure is generated by combustion.
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Lycoming cylinder
head after in-flight separation of barrel from head. Notice the
exhaust stains to the left. The stains show that the cylinder left tale-tail signs before
failure that there was a crack. The stains usually occur about 3 fins up the
head from the barrel. This in-flight failure may have been prevented by looking
carefully at the cylinder fins. Another method you can use is to ping the fins
with a plastic pin to hear them ring. A cracked fin or crack at the base of the
fin causes the fin to give a dull sound.