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Lycoming valve stem cap

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Flying High

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I was reading through the overhaul manual for my angle valve IO-360 and read this;

Angle Valve Cylinder. Slide rocker shaft back
and install rocker (22, figure 6-6) and thrust washer
(23, figure 6-6). Before installing exhaust valve rocker
place special cap (32, figure 6-6) over the exhaust
valve stem
. Slide rocker shaft back into position.

Why does the exhaust valve have a "special" cap?
 

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