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1. Stuck valve. See symptom "stuck valve".
Note: Valve may not be stuck now but may have been stuck previously when the
push rod bent. Most typically it is the exhaust push rod that bends.
2. Broken exhaust valve. Valve train damage can interfere with
rocker arm motion. Inspect push rod and hydraulic lifter after
any valve train trauma.
3. Broken rocker boss.
4. Severely stuck valve hydraulic lifter. 5. Lycoming "76" series
engines such as the O-320 H2AD engines, pulled or loose rocker shaft stud.
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Aeronca