The situation when the vehicle with transmission-carry refuses to start due to a faulty starter, often catches the owner by surprise. Unlike a manual transmission, where the launch from the pusher is a regular procedure, machine It imposes serious restrictions on the methods of resuscitation of the engine. Many drivers mistakenly believe that the decades-old method of spinning wheels will be suitable for their modern car, but the physics of the hydraulic transformer dictates different rules.
The main problem lies in the lack of a rigid connection between the internal combustion engine and the transmission at low revs. HydrotransformerThe torque transmitter works by flowing fluid, and for effective force transfer it needs a certain speed of rotation. Attempting to start a machine without a starter by conventional towing often results in useless rotation of the wheels while the engine remains stationary.
However, there are emergency methods to start the motor if the starter fails and tow truck assistance is not available. It is critically important to understand that these methods pose a direct threat to the integrity of the transmission and can finally disable expensive units. In this article, we will discuss in detail the physical possibility of such a launch, consider step-by-step instructions for different types of boxes and assess the real risks for your car.
Why the classic method of "pushing" is dangerous for the machine
To understand the complexity of the task, you need to refer to the design hydrotransformer. In a mechanical box, the clutch rigidly connects the engine and wheels, so the rotation of the wheels is transmitted directly to the crankshaft. In the automatic transmission between the inlet and outlet shaft is oil. When you try to push the car, the oil is simply mixed, not creating enough pressure to turn the engine.
There is an opinion that if you accelerate the car to high speed and sharply turn on the gear, the engine will start. This misconception can cost you very dearly. Hydraulic impact, which occurs when a sharp turn on the gear on the go, is able to destroy friction packets and damage planetary rows. The pressure in the system with such a maneuver jumps instantly, and seals may not withstand the load.
⚠️ Attempt to start a classic automatic machine with a hydraulic transformer by the pusher method at high speed in 90% of cases leads to a major repair of the automatic transmission. The oil does not have time to create a rigid bond, and you risk damaging the gear selection mechanism.
In addition, modern security systems often block the ability to start the engine, if not receiving a signal from the standard. starter. The electronic control unit (ECU) can ignore attempts to ignite the mixture, considering the situation to be emergency. Therefore, before any manipulations, it is worth checking whether there is a spark and fuel pressure when scrolling in other ways.
Physical launch capability: when it is real
Starting the engine without a starter on a car with an automatic gun is theoretically possible only in one case: if you can spin the crankshaft to idling turns (usually 600-800 rpm) before the gear turns on. In practice, this means that the wheels must twist the transmission, which, in turn, through a rigid lock, must turn the engine.
Some types of transmissions, for example, variators (CVT) Or robotic boxes with one clutch, have their own characteristics. In robots, launching from a pusher is sometimes possible because there is a mechanical clutch, but electronics often forbid this. Variators are extremely sensitive to jerks and the absence of oil pressure, which creates a pump driven only by a working engine.
- 🚗 Traditional hydraulic transformer: Starting is almost impossible without the risk of breakage, the communication through the liquid is too weak at low revs.
- 🤖 Robotic transmission: Theoretically possible if the design allows for the clutch to be broken and there is a mechanical coupling, but electronics often block the process.
- 🔄 CVT: It is not recommended, since the absence of oil pressure when rotating from the wheels will lead to friction of the metal against the metal cones.
It is also important to consider the state of battery. Even if you can spin the engine physically, you need energy to open the nozzles and create a spark. If the battery is completely dead, the engine won’t start no matter how much you tow the car. A weak charge may be enough to ignite, but it will not be enough to operate the gas pump at start-up.
Towing method: step-by-step instructions and nuances
If you still decide to try to launch by towing, understanding all the risks, you must follow a strict sequence of actions. This method requires the participation of a second car and two people: one behind the wheel of the towed car and one behind the wheel of the tractor. The towing speed must be higher than for mechanics to try to "swing" the hydraulics.
Before starting the procedure, make sure that the selector DISTRIBUTION neutralized N. Start the acceleration process. When the speed reaches 30-40 km / h, it is necessary to smoothly but confidently transfer the lever to the position. D or L/1 to create a greater load. At the same time, the driver of the towed car must press the accelerator pedal.
As soon as the engine catches and starts working, it is necessary to immediately return the selector to neutral. Nso as not to overload the transmission with speed. Let the motor warm up on blanks. If the first attempt of the start did not occur, repeat the procedure no more than 2-3 times. Long towing with gear on without a running engine kills lubrication knots.
☑️ Checklist before towing
There is also a method of starting with a cable if there is no second car, but it requires ideal conditions: gentle descent and no traffic. Maina is accelerated by coasting, and at the time of reaching maximum speed, they try to turn on the gear. The efficiency of this method for automatics tends to zero, since the inertia of the machine is rarely enough to create the desired pressure in the hydraulic transformer.
Direct engine start: a technically complex method
The safest for the transmission, but difficult for the performer, is the method of direct start of the engine, bypassing the standard start system. The essence of the method is to force the crankshaft to scrolle using an external source of rotation (for example, another serviceable car through a belt transmission or a powerful power tool, although the latter is extremely rarely applicable in the field).
To implement, access to the crankshaft pulley will be required. On some cars, you can use a belt thrown from the pulley of the generator or pump GUR of a serviceable car on the pulley of the lapshaft of the faulty one. And yet, transmission shall be removed (the lever in the P or N). This allows you to spin the engine to working turns, regardless of the state of the starter and box.
The sequence of actions for direct start:1. Install cars side by side, fix the wheels.
2. Remove the belt of the drive of the hinged units from the donor.
3. Throw the belt on the recipient's kneeshaft pulley.
4. Turn on the ignition on the starting car.
5. Start the donor engine for a short break.
This method requires special tools and skills. Incorrect alignment of the belt can lead to its jumping and injuries. In addition, in modern tightly packed engine compartments, access to the crankshaft pulley is often difficult or impossible without dismantling the protective elements.
⚠️ Warning: When starting directly, make sure the gearbox is in the parking lot
P. Any movement of the car at the time of the connection of the belts will lead to rupture of the drive and possible injuries.
Use of the launcher (Buster)
Often the problem of inability to start is not a mechanical breakage of the starter, but in the lack of starting current due to a dead battery. In this case, the starter clicks or slowly spins, but cannot turn the engine. Using a booster is the most civilized and safe way to solve a problem.
The start-up charger provides a powerful pulse of current, which is enough for work. electric motor The starter is even with a completely dead main battery. This allows you to start the engine in a normal way, without exposing the transmission to any loads. Modern lithium-ion boosters are compact and should be in the arsenal of every owner of a car with automatic transmission.
To connect, you must observe polarity: red clamp to plus (+), black to minus (-) or mass. After connecting the booster, wait a couple of minutes to “wake up” the battery chemistry, and try starting. If the starter is working, but it lacked power, the car will start immediately.
Why is a booster better than a light from another car?
The booster gives an instant powerful current pulse, which is necessary precisely for scrolling the starter. When lighting from a live machine, the current goes through wires that may be thin, and through a dead battery, which acts as resistance. The booster will bypass the dead battery, feeding current directly to the starter.
Comparison of risks and probability of success
In summary, it is necessary to objectively assess the chances of success of each method and the potential damage. Owners of cars with automatic transmission should think ten times before choosing the method of "pusher". Savings on calling a tow truck can result in the cost of a new gearbox.
The table below compares the main methods of starting the engine without a regular starter for cars with automatic transmission:
| Method | Probability of success | Risk to automatic transmission | Conditions required |
|---|---|---|---|
| Towing (classic) | Low (10-15%) | critical | The cable, second car, straight road |
| Direct launch (belt) | High (80%) | Absent. | Access to pulley, second car, belt |
| Launcher | High (90%) | Absent. | Availability of a booster, proper starter itself |
| Replacement starter | 100% | Absent. | Skills, tools, time |
The most reasonable solution in case of breakage of the starter is its replacement or use of mobile services. If the starter is jammed, no towing will help - the engine will not physically be able to turn. In such cases, only the removal of the node or evacuation remains.
Always carry with you in the car contacts of the verified evacuation service with the manipulator. For cars with automatic transmission, this is the only guaranteed safe option for delivery to the service when the running gear or launch system breaks.
Frequently Asked Questions (FAQ)
Can I start the CVT from the pusher if the starter is burned?
Absolutely not. The CVT works on friction and requires constant oil pressure, which creates a pump driven by the engine. When the wheels are rotated, the pump does not work, the cones of the variator remain dry. Attempting to launch will result in instant slack on work surfaces and costly repairs.
Will taking off the starter and scrolling the drill help?
Theoretically, this is possible if you have a powerful drill or screwdriver with a head under the pulley bolt and an appropriate adapter. However, the torque of a household tool is rarely enough to turn a cold engine with compression. It’s more of a garage myth than a working method.
What if the starter clicks but does not spin on the machine?
Most likely, the problem is the battery or poor mass contact. Try to clean the terminals or put a load on the headlights. If the battery is charged, it may have jammed the bendix. In this case, sometimes helps a neat blow to the body of the starter, but on a car with automatic transmission access to it is often difficult.
Will the box break if you tow the car on the cable with the ignition turned on?
Yes, the risk is great. Even with the ignition on, the automatic transmission oil pump does not work, since the engine is silenced. Long towing at a distance of more than 50 km or at a speed above 50 km / h without a working engine can lead to overheating and destruction of frictions due to the lack of lubrication.