Can Sealing the Exhaust Pipe Prevent Water from Flooding the Engine?

[PrestonAnn]

No. The engine is not completely sealed. For example, the oil dipstick position is a possible water inlet, and water may enter the crankshaft case. More importantly, the intake and exhaust systems are involved. Below is the relevant explanation: When the engine stops, the cylinders may be in any position, and the intake and exhaust valves may be open. If water enters the intake or exhaust system, it may flow into the cylinders. Starting the engine at this time, during the compression stroke, the liquid cannot be compressed, causing the crankshaft connecting rod mechanism to endure extreme mechanical force and resulting in damage. Therefore, to prevent water from entering, it is necessary to effectively seal the intake and exhaust passages and all possible water entry points on the engine.