With the onset of the spring slurred or after prolonged rainfall, roads turn into a series of mini-lakes, the detour of which often becomes impossible due to dense traffic. Drivers, wanting to keep the cabin clean and avoid hydraulic shock, instinctively pressed to the right edge of the carriageway, launching one side of the car through the ford, and leaving the other on dry asphalt. This tactic seems logical only at first glance, but in reality creates a huge uneven load on all systems of the car.
Few people think that diagonal At the time of entry of the wheel into the water is a critical stress factor for the geometry of the chassis. If you drove a deep puddle on one side and heard a strange knock or felt the steering wheel, then the process of destruction has already started. In this article, we will discuss in detail the physical processes that occur with your motorcar In such seconds, and explain why the savings on dry cleaning can result in expensive repairs of the chassis.
There is also a hidden risk that is not known in driving schools: loss of traction on one of the wheels can lead to uncontrolled skidding, especially if there is an open hatch or a deep hole under the water. A sharp difference in altitude between the left and right wheels, even 10-15 centimeters at speeds above 40 km / h, can provoke a rollover of a car with a high center of gravity. Let’s look at the technical aspects of this problem in more detail.
Critical distortion of body and frame
When one side of the car is plunged into a deep track or a hole of water and the other remains at a high level, the body experiences a torsion. For modern load-bearing bodies, which are designed with a view to a certain torsion rigidity, such loads are non-standard. Metal, of course, has elasticity, but with frequent repetition of such situations in the welding-point And the compounds of spars can occur microcracks, which grow over time.
Especially vulnerable in this regard frame SUVs and old models of cars, where the frame takes the brunt of the blow. If you regularly practice driving obstacles “wrongly”, the geometry of the frame may be disturbed. This will lead to the fact that the doors will begin to close worse, there will be gaps in the joints of the body panels, and suspension will work incorrectly due to the displacement of the attachment points.
⚠️ Attention: If after passing a deep puddle with one wheel you notice that the car began to pull to the side or the steering wheel got crooked even on a flat road, immediately consult the diagnosis of collapse-descendence. Ignoring this symptom will accelerate the wear of rubber.
The most at risk are cars with a long wheelbase and low body rigidity for twisting. At the moment when the front right wheel is already in the hole, and the rear left is still on the asphalt, the body works as a lever, turning the mounts of the units. Recovery of body geometry after such deformations is a complex and expensive process that often requires replacement of elements or complex adjustments on the slip.
Impact load on suspension elements
The most obvious but often underestimated risk is mechanical damage to suspension elements when hitting water-hidden obstacles. The water in the puddle works as a great camouflage for sharp edges of pits, broken bricks or metal hatches. When a wheel at high speed flies into such an obstacle, the shock absorber receives a sharp blow in the lower position, which can lead to its collapse. break-in Or the destruction of a stock.
Levers, ball supports and Silentblocks also take on the colossal energy of the impact. If you drove a puddle on one side, the load was unevenly distributed: one side worked normally, and the other experienced overload. This often causes the ball supports to be pulled out or the levers deformation, which at high speed threatens to lose control.
The situation is aggravated if the car is equipped with low-profile rubber. The lack of a high profile prevents the tire from extinguishing the impact energy, and all the force is transferred directly to the disk and parts. suspension. As a result, the disc may get an “eight” or a crack, and the tightness of the connection between the bus and the disk will be broken, which will lead to a rapid descent of the wheel.
- 🛑 A sharp impact can shift the angle of the wheel installation, which will lead to rapid and uneven wear of the tread.
- 🛑 Silent blocks of levers when twisting can break, which will cause knocks and backlashes in control.
- 🛑 The suspension springs may not withstand the dynamic load and burst, especially if the metal is already tired.
Risk of hydraulic shock for the engine
The passage of a deep puddle on one side creates the illusion of safety for the engine, since the air intake is often above water level. However, this is only true for ideal conditions. In practice, the water raised by the front wheel forms a powerful wave that can overwhelm the body. air-intakeEven if the static water level is below the critical level.
Hydroshock is the entry of water into the cylinders of the engine through the intake manifold. Because the water is incompressible, the piston going up cannot overcome the resistance of the liquid, which leads to the engine stopping and, in the worst case, to the destruction of the rods and cylinder block. Repair after hydraulic shock is often comparable in cost to the purchase of a new engine.
The danger is increased if you are moving towards another vehicle that is also overcoming a water barrier. The counterwave can raise the water level at your side 20-30 centimeters above the static level, which will be fatal for the airborne. vent. Even if you drive the puddle carefully, splashes from your own wheel can be pulled into the air filter pipe.
⚠️ Attention: Never try to restart an engine if it is stalled in water. This is guaranteed to lead to a waterstrike. Call a tow truck and check the air filter for moisture.
What happens inside the engine when hydraulic shocks?
Water enters the cylinder, and in a compression stroke the piston rests on the water plug. The inertia of the flywheel and crankshaft is so great that the rod cannot withstand the load and breaks or bends, breaking through the cylinder block. The engine receives critical damage, incompatible with further operation without major repairs.
Impact on brake system and electrics
In addition to mechanical damage, a deep puddle poses a threat to the brake mechanisms. With a sharp cooling of the red-hot brake discs with cold water from a puddle, the metal can deform, which will lead to the beating of the steering wheel during braking. In addition, water washes the lubricant from the calipers and contributes to the corrosion of the guides, which is why the brake pads can start to peck.
The electric part of a modern car is also vulnerable. High pressure water (which is created when the wheel is rotated) is able to penetrate into the ABS sensor connectors, the wiring running along the spars, and even into the engine control unit if it is located low. A short circuit in wet wiring can disable expensive electronics.
Particular attention should be paid to parking sensors and rear-view cameras, which are often located low in bumpers. The ingestion of water under high pressure into the housing of these devices leads to their fogging and failure. Restoration of leakage electrician After such a bath requires a complete disassembly and drying of contacts.
| System system | Type of damage | Effects of consequences |
|---|---|---|
| Brake system | Disc deformation, corrosion | Beating the steering wheel, reducing the effectiveness of braking |
| Electrical wiring | Closure, contact oxidation | Sensor failure, failures in the ECU |
| Suspension | Hitting Hidden Obstacles | Breaking down levers, hub bearings |
| Kuzov | Twisting, corrosion | Disturbance of geometry, the appearance of rust |
Car behavior and risk of loss of control
The dynamics of the car when passing a puddle with one side changes dramatically. The wheel, which falls into the water, loses traction with the road (the aquaplaning effect), while the wheels on the dry side continue to confidently hold the trajectory. This creates multidirectional thrust vectors, which can lead to a sharp jerk of the car towards the water.
If there is oily film or dirt under water, the coefficient of adhesion drops to almost zero. At this point, the stability system ESP or ABS may not have time to work out the situation correctly, since the sensors record a sharp change in the speed of rotation of the wheels. The driver is forced to urgently adjust the trajectory, which on a slippery road often leads to skids.
If you still have to pass a puddle, try to do it at the lowest possible speed and without sharp steering turns. Move straight to stabilize the car.
This behavior is especially dangerous at high speeds or when overtaking. A sharp drop in altitude and a change in the coefficient of clutch can cause the car to roll over, especially if it is a high SUV or minibus with a loaded top. The inertia of the wheels may be too great to compensate with the steering wheel.
Hidden effects: corrosion and pollution
Even if the car survived the passage through the puddle without visible damage, corrosion processes begin inside the hidden cavities. Water trapped in spars, rapids and arches is trapped there along with dirt and reagents. This creates ideal conditions for the development of rust from the inside out, which significantly reduces the service life of the body.
Mud slurry clogs drainage holes in doors and sills, disrupting the ventilation of internal cavities. As a result, moisture does not evaporate, but accumulates, accelerating the rotting of the metal. Regular washing of the bottom and inner cavities after the rainy season helps minimize this damage, but eliminating the risk is difficult.
It is also worth remembering about the pollution of the cabin. Even with a careful passage, splashes of dirty water can get through the looseness of doorways or ventilation on the carpet. Wet and dirty upholstery is a breeding ground of bacteria and a source of unpleasant odor, which is very difficult to remove without professional dry cleaning.
☑️ What to check after a deep ford drive
The right tactics to overcome water obstacles
To minimize risks, you need to follow certain tactics. If the detour of the puddle is impossible, assess its depth on the cars in front or with a stick. If the depth exceeds half the height of the wheel, it is better not to risk the passage. If the water is knee-deep or lower, move in the first gear at a constant low speed, without releasing the gas pedal to create excessive pressure of exhaust gases and prevent water from entering the exhaust system.
Try to drive a puddle in the middle, where the depth is usually the least, even if you have to sacrifice the purity of the bumper. The uniform distribution of the load on the suspension and body in this case is more important than clean doors. After leaving the water several times slightly press the brake to dry the discs and pads with friction.
⚠️ Attention: Never turn off the engine immediately after overcoming the ford. Let him work a couple of minutes on idle turns to warm up the under-hood space and evaporate moisture from the hot parts.
The safest solution is to drive around a deep puddle, even if you have to break the row or slow down a little. Repair of the suspension and body is always more expensive than the time spent on detour.
Frequently Asked Questions (FAQ)
What happens if you die in a deep puddle in the middle?
If the engine is dead, do not try to start it again. It'll lead to a waterstrike. You need to call a tow truck that will pull the car in tow. Independent attempts to get out can aggravate the situation and damage the transmission.
How do I know if a hydro impact has occurred?
Signs of hydraulic shock are a sharp stop of the engine with a characteristic sound, the presence of water in the air filter body, as well as water on the probe of the oil level (oil will become similar to an emulsion or coffee with milk). Visually, the rod fracture can be seen when removing the pallet.
Can I dry the brakes after a puddle?
Yes, it has to be done. After passing a deep puddle on a safe section of the road, you need to gradually press the brake pedal several times. Friction of the caps on the discs will heat them and evaporate moisture, restoring the effectiveness of braking.
Is the water dangerous to the exhaust system?
If the engine is running, the exhaust gases are released under pressure, preventing water from entering. The danger arises when a hot muffler (metal crack) is sharply cooled or if the engine stalls and the water has flowed into the pipe, blocking the gas output.