How to Determine Engine Water Intake Based on Flood Level?
2 Answers
Water reaching the engine's air filter position indicates water intake, but for most sedans, flooding above the vehicle's chassis poses a risk of engine water ingress. Once water enters the engine, it can cause stalling and, in severe cases, be sucked into the engine internals, leading to permanent damage. Never attempt a secondary ignition after engine water intake; immediately call for roadside assistance. Below are key points about engine water intake: 1. If the vehicle stalls due to water intake during wading, immediately turn off the ignition switch. Do not attempt to restart the engine. Move the vehicle to a safe location, ideally with the front higher than the rear to allow water in the exhaust pipe to drain, preventing damage to the catalytic converter and muffler. 2. Chassis components are prone to lubricant contamination during wading, particularly in steering and drivetrain systems.
After driving for so long, I've seen quite a few cases of engine water ingestion. The critical point for judging water depth is usually at the center of the wheel, which is about half the height of the tire. Once the water exceeds this point, such as submerging the wheel hub, there's a risk of water being sucked into the intake, causing hydro-lock, which can bend connecting rods and damage pistons. The speed of water flow also greatly affects wading; driving fast and splashing water is actually more dangerous. Once during a heavy rain, the water level rose above half the tire, and although I immediately turned off the engine, it still cost me thousands in repairs. Checking the engine oil and air filter afterward is crucial. SUVs, with their higher intake positions, might handle slightly deeper water, but for safety, don't take risks. If the water depth seems questionable, stop and observe—don't force your way through to avoid greater losses.
