How do you take bump clearance of the marine engine?

To take bump clearance of a marine engine, first, ensure the engine is in a safe and stable condition. Then, remove the spark plugs for easier rotation of the crankshaft. Use a dial gauge to measure the distance between the piston and the cylinder head by rotating the crankshaft to find the highest point of the piston. Record the measurement, which indicates the bump clearance, ensuring it meets the manufacturer's specifications for optimal engine performance.