When operating an engine with a potential hydraulic lock, what resistance during prop turning indicates a problem?

When an engine experiences potential hydraulic lock, one significant indication is the presence of resistance during the turning of the propeller due to oil in the combustion chamber. Hydraulic lock occurs when liquid, typically oil or fuel, fills the combustion chamber and prevents the piston from completing its stroke.

In this scenario, when you attempt to turn the prop and encounter resistance, it can indicate that liquid is present, preventing movement. The specific resistance linked to oil in the combustion chamber signifies that there's an abnormal accumulation of fluid that could lead to engine damage if not addressed.

Resistance from the oil system or spark plug malfunction would not specifically indicate hydraulic lock, as those issues relate to different systems within the engine. The absence of resistance could imply that there are no physical obstructions like fluid buildup, suggesting a healthy engine condition, contrary to the implications of hydraulic lock. Understanding these operational dynamics is crucial for effective engine troubleshooting and maintenance.