The situation when the battery is completely discharged at the most inopportune moment, familiar to many drivers. This is especially common in severe frosts or after long parking, when the chemical processes in the battery are slowed down. If there is no “lighter” or starter at hand, the only way out is the good old method of starting the engine from the inertia of the rotation of the wheels.
This method is effective only for vehicles with gearboxIt requires a strong connection between the wheels and the engine crankshaft. Owners of automatic machines, variators and robotic transmissions cannot use this method without the risk of fatal transmission damage. The right sequence of actions will allow the engine to be revived in a few minutes, but requires a clear understanding of the physics of the process.
Before starting active actions, it is necessary to assess the condition of the road surface and the availability of assistants. An ice crust or steep climb can make an attempt unsuccessful or even dangerous. Below we will discuss in detail the algorithm of actions, technical nuances and potential risks that this emergency method hides.
The principle of operation of the start from inertia
The essence of the method is the forced rotation of the crankshaft of the engine due to the energy of the car. When you turn on the gear and release the clutch on the moving car, the wheels through the transmission transmit torque to the piston group. starter At this point, it does not participate in the process, its function is performed by the kinetic energy of the accelerated car.
To ignite the fuel-air mixture, it is necessary that the engine reaches certain turns at which compression in the cylinders will be sufficient for a flash. Usually this value is from 60 to 100 revolutions per minute, which is quite achievable at a speed of about 5-10 km / h in the second or third gear. It is important to understand that inertia It should be sufficient not only to turn, but also to maintain operation until the generator starts to produce current.
The effectiveness of this method depends on the state of compression in cylinders and serviceability of the ignition system. If the spark plugs are completely filled with gasoline or there is no spark, no acceleration speed will help. Also plays a role temperature of the oil: in severe frost the viscosity of the lubricant increases sharply, creating additional resistance, which is difficult to overcome by the pushers.
⚠️ Warning: Attempting to start the car from a pusher on a slippery surface (ice, rolled snow) often leads to the wheels being torn into slippage. In this case, the energy is used to burn rubber, not to turn the engine. Look for a site with good grip or use sand to increase friction.
Mechanical communication between the nodes allows you to ignore the state of the battery if it is discharged completely, down to zero volts. However, if there is a short circuit in the onboard network, such a start can provoke a fire of the wiring, since the current will bypass the fuses through the mass. Therefore, a visual inspection of the under-hood space before the procedure is mandatory.
Why can't you start the machine from the pusher?
In automatic transmissions there is no rigid connection between the output shaft and the turbine of the hydraulic transformer with the engine not working. The transmission oil pump does not work, so an attempt to tow will result in dry friction and instantaneous friction destruction.
Preparation of the vehicle and assessment of conditions
Before the procedure, you need to make sure that the car is technically ready for a jerk. First of all, check the oil level in the engine: dry friction during a cold start with a high load can cause serious damage to the crankshaft liners. If there is no oil on the probe or it is critically small, it is forbidden to start the engine in any way.
Next, you should switch the gearbox to a neutral position and free the car from excess cargo. Having heavy passengers or a full trunk will require a lot of effort to disperse, which can be problematic with a small number of assistants. It is also recommended to squeeze the clutch pedal and check the freedom of its movement - the squeezable bearing jammed will not allow the transfer to be turned on at the right time.
- 🚗 Make sure the car is on a flat surface or has room to accelerate downhill (incline).
- 🔋 Check the battery terminals for oxidation – poor contact can prevent sparks from appearing even when successfully started.
- 🛑 Lock the parking brake before starting preparation, so that the car does not roll spontaneously.
- 👥 Find 1-2 physically strong assistants or choose a gentle descent for acceleration without people.
Particular attention should be paid to the cooling system. If the cause of battery discharge is a break in the generator belt, which simultaneously leads to the pump, then prolonged operation of the engine after starting from the pusher can lead to overheating. In such cases, it is necessary immediately after starting to shut down the engine and move to the repair site, controlling the temperature.
Step by step: Start with assistants
This is the classic and most common method, requiring coordination between the driver and pushers. The driver gets behind the wheel, squeezes the clutch and turns on the second gear. The second gear is not chosen by chance: the first too high load on the engine, which can lead to locking the wheels, and the third is difficult to achieve the desired speeds.
Assistants start pushing the car, gradually increasing speed. Once the speed reaches 10-15 km/h, the driver must smoothly but quickly throw the clutch pedal. At this point, a jerk occurs, the engine begins to rotate, and if the ignition system is working, a flash occurs. Feeling the engine, you must immediately squeeze the clutch again so that the car does not stall, and add gas.
After a successful start, do not rush to turn on the headlights or glass heating. Let the engine work at idle speeds for 2-3 minutes, so that the oil disperses through the system and the battery begins to take charge. A sharp turn on powerful consumers immediately after the start can again “land” barely revived battery.
☑️ Launch checklist with assistants
It is important to remember about safety: pushers should not rely on sharp edges of the body or bumper, so as not to get injured in the event of a sharp start of the car. The driver’s commands should be loud and clear. If you failed to start from the first attempt, repeat the procedure, but not more than 3-4 times in a row, so as not to overheat the starter (if it is still spinning) or pour candles.
Launching solo: the slope and cable method
If there are no assistants nearby, the only option is to use the terrain or the inertia of your own body. The slope method is most effective: the car is put “on the hill” with the nose down, fixed by a handheld. The driver sits in the cabin, turns on ignition, second gear and removes the car from the hand brake.
The machine starts to roll, gaining speed under the influence of gravity. As soon as the speed becomes sufficient (usually it is felt by the vibration of the body), you need to sharply, but not to the end, release the clutch. The engine has to grab. If the slope is not steep enough, you can try to rock the car, including the transfer at the time of the highest rolling speed.
There is also a method of launching with a towing cable if it is possible to catch another car or stationary object (which is dangerous and requires caution). In this case, the cable is attached to the towing hook, the driver turns on the gear, and a sharp jerk of the cable turns the wheels. This method requires experience, since there is a high risk of damaging the rope attachment elements or transmission if a sharp jerk is too sharp.
⚠️ Warning: When running alone on a slope, be sure to make sure there is no obstacle, cliff or busy track at the end of the descent. If the engine does not start, it will be extremely difficult to stop the accelerated car without a working brake amplifier.
For cars with a carburetor engine, the method of “start curve” with a cable wound on a crankshaft pulley is sometimes used, but for modern injector machines this is irrelevant and dangerous. In modern conditions, it is better to use portable boosters that are placed in the glove compartment and guaranteed to start the engine without dancing with a diamond.
If you often park in places where it is difficult to start the car from the pusher, buy a compact lithium-polymer starter (booster). It is inexpensive, stored in the cabin and allows you to start the car in any frost without assistance.
Table of transmission selection and speed
Choosing the right transfer is a key factor in success. Too low a gear will create excess drag and the wheels may get locked. Too high will not give you enough torque. Below is a reference table of parameters for start-up.
| Type of engine | Recommended transfer | Required speed (km/h) | Probability of success |
|---|---|---|---|
| Gasoline 1.0 - 1.6 l | II (Second) | 10 - 15 | Tall. |
| Gasoline 2.0+ l/Diesel | III (Third) | 15 - 20 | Medium |
| Carburetor (old cars) | II or III | 10 - 12 | Tall. |
| Injector (cold engine) | II (Second) | 15 - 20 | Low. |
As can be seen from the table, for most passenger cars, the second gear is optimal. It provides a balance between the speed of rotation of the wheels and the force transmitted to the crankshaft. The third gear is used for large-volume engines or in cases where the second one causes a strong load and jerks.
It is worth noting that diesel engines It is much more difficult to start from the pusher due to the high degree of compression. They require either a very high acceleration speed, which is dangerous, or the help of a more powerful tow car. In winter, a diesel without a preheater from the pusher may not start at all.
Frequent mistakes and risks to the car
Despite the popularity of the method, it is not harmless to a modern car. The main burden falls on the catalytic converter. When starting from the pusher, a large amount of unburned fuel can get into the cylinders, which burns out already in the exhaust manifold, causing overheating and melting of the catalyst cells.
Another risk is damage to the belt. With a sharp jerk, when the wheels through the transmission sharply turn the crankshaft, the inertia of the camshafts can lead to a slip of the belt or even its jump on the tooth. For engines with an “interval” design, this threatens to meet valves with pistons and overhaul.
- 🚫 Do not try to start the car from the pusher, if you suspect a break in the belt of the timing - it will finish the engine.
- 🚫 Avoid the method if the car is in the parking lot with a dense number of other cars - there is a high risk of uncontrolled rollback.
- 🚫 Do not hold the gas pedal “in the floor” during the start, this will pour candles and wash the oil film from the walls of the cylinders.
The clutch is also suffering. Sharp pedal throws at high engine speeds (after start) lead to intense wear of the friction plates of the disc. Regular use of this method reduces the resource of the node. Therefore, consider launching from the pusher only as an emergency measure, and not as a regular procedure.
⚠️ Warning: If after starting from the pusher the engine is unstable, stalls when gas is discharged or an extraneous noise is heard - immediately silence it. Continuation of movement can lead to serious breakdowns of the attachment equipment or the piston group itself.
Starting from a pusher is a trade-off between mobility and risk to the engine. Use it only in a hopeless situation when other methods are not available.
Alternatives and prevention
Instead of risking the integrity of the car’s nodes, it’s better to have a plan B. The most reliable option is the wires for “lighting” from another car. This method is safe for the engine, as the starter turns the crankshaft at the right speed and in the right direction, without jerks.
The modern alternative is boosters (launchers) They are compact, do not require a second car and allow you to start the engine even with a completely dead battery. The investment in such a device pays off after the first use in the remote taiga or in the parking lot of the shopping center.
To prevent discharge in winter, it is recommended to remove the battery terminal during prolonged parking or use special blankets-heaters for battery packs. It is also worth (check) the tension of the generator belt and the condition of the brushes to be sure of charging the battery while driving.
If you own a car with an automatic box, forget about pushing. Your only friend in this situation is a tow truck or a mobile help-on-the-road service. Experiments with automatic transmission end in expensive repairs, the cost of which will exceed the price of the cheapest tow truck.
Can I smoke from a working car with a stunted donor engine?
Yeah, that's even preferable. Turn off the donor’s engine, plug in the wires, wait 5-10 minutes to recharge the dead battery, then try to start the recipient. This reduces the load on the donor’s generator and electronics.
Questions and Answers (FAQ)
How many times can you try to start a car from a pusher?
It is recommended to make no more than 3-4 attempts in a row. After each failure, you need to give the starter (if it is still spinning) and the battery to cool down, and also check whether the candles have flooded. Excessive attempts can cause a spark to be discharged in the ignition system or damage to the starter.
Is it harmful to the injection engine?
Yeah, more harmful than a carburetor. An electronic control unit (ECU) may not properly work out the start-up time by supplying too much fuel. This threatens to fail the lambda probe and catalyst. In addition, a sharp turn can bring down the phases of the GRM.
Why does the car start with a pusher, but there is no starter?
Most likely, the problem is in the starter itself (wear of brushes, retracting relays) or in the extremely low current of the cold scrolling battery, which cannot turn the motor through the regular starter gearbox, but the inertial method compensates for this lack of acceleration power.
Can I start a diesel with a pusher in winter?
It is very difficult and often impossible without prior warming up. Diesels require high compression and temperature to ignite. On cold, even from acceleration, the fuel may not flash, but only get into the cylinders, which will aggravate the situation.