The situation when a car is treacherously silent when you turn the ignition key is familiar to many drivers. A dead battery, starter malfunction or contact problems can take you by surprise at the most inopportune moment. In such cases, a decades-proven method comes to the rescue - starting the engine from a pusher, which allows you to continue driving without calling a tow truck.
However, this process requires a clear understanding of the mechanics of work transmissions and compliance with safety precautions so as not to cause irreparable damage to units or get into an accident. Incorrect actions can lead to timing belt rupture or catalyst damage, so it is important to know not only the sequence of actions, but also the physics of the process.
In this article we will analyze in detail the algorithm of actions for a manual transmission and explain why Automatic transmissions should absolutely not be started in this way., and consider alternative launch options in the field.
Physics of the process: why does the engine start?
To understand exactly how the launch occurs, you need to imagine the work internal combustion engine. To start ignition of the fuel-air mixture, the crankshaft must rotate at a certain frequency. Typically this job is done by an electric starter powered by a battery. When the battery is discharged, the starter cannot develop the required torque.
The pushrod method replaces the electrical energy of the starter with the kinetic energy of the moving vehicle. When you accelerate the car and suddenly release the clutch in gear, the wheels transmit rotation through the transmission to the crankshaft. If the rotation speed reaches minimum required speed, the ignition system (subject to the presence of a spark) ignites the mixture and the engine starts.
It is important to understand that significant force is required to turn the pistons. That is why the method is effective only on cars with manual transmission, where the connection between the wheels and the engine is rigid and controlled by the driver. In automatic transmissions, the torque converter does not transmit rotation from the wheels to the engine when it is turned off.
Preparing the vehicle and checking conditions
Before taking active action, it is necessary to assess the situation and prepare the vehicle. Make sure that the reason for the lack of starting actually lies in the starter or a dead battery, and not in the lack of fuel or a broken fuel pump. If, when you turn the key, the starter turns vigorously, but the car does not start, there is no point in pushing it.
Check the oil and coolant levels. Jump starting the engine creates extreme loads, and if there is insufficient lubrication, this can lead to scoring in the cylinders. It is also worth visually inspecting the belt gas distribution mechanism (if visible) for integrity.
⚠️ Attention: It is strictly forbidden to try to push start the car if you suspect a broken timing belt. A sharp jerky rotation of the crankshaft can lead to valves meeting the pistons and a major engine overhaul.
Choose a suitable place to maneuver. A gentle slope or a long straight road with a smooth surface is ideal. Avoid steep descents with sharp turns, as they do not work with the car turned off. power steering and a vacuum brake booster, which makes steering extremely difficult.
If you're alone and there's no downhill nearby, try using the "swing" method: push the car forward, get in, put it in gear, brake, and repeat the cycle until the car accelerates enough to launch.
Classic method: launching with assistants
The most common and effective way is to use the physical strength of several people. For a light sedan, two or three strong assistants are usually enough. Your task as a driver is to coordinate their actions and clearly manage transmission.
The sequence of actions must be worked out until it becomes automatic. First, the driver sits behind the wheel, depresses the clutch and engages second gear. Why the second one? The first gear has a gear ratio that is too short, which will cause the wheels to rotate too slowly relative to the engine, or the jerk will be too sharp, which is dangerous for the vehicle. drive shafts. Third gear, on the contrary, may not create enough cranking force.
Signal to your assistants, and when the car reaches walking speed (about 5-10 km/h), quickly but smoothly release the clutch pedal. At this moment you will feel a characteristic push and operation of the engine. As soon as the engine catches, immediately depress the clutch again to prevent the car from stalling, and add a little gas, maintaining speed above idle.
☑️ Algorithm for launching from a pusher
Running Solo: Using Terrain
If there are no assistants nearby, the only option is to use gravity. Find a section of road with a slope. Get into the car, turn on the ignition and, holding the brake, engage second gear. Release the parking brake and allow the car to start moving.
As soon as the speed increases to 10-15 km/h, sharply, but without fanaticism, release the clutch pedal. The car will jerk and the engine should start. Immediately after this, depress the clutch to prevent the car from stalling, and apply the brakes if the slope becomes too steep. Don't forget that without a running engine, the brakes will be "rocky" and require significantly more pedal effort.
This method is less predictable than pushing by assistants, since it is more difficult to control when the gear is engaged. However, it is often the only salvation in deserted areas. The main thing is not to panic and hold tight steering wheel.
What to do if the car on a slope does not start the first time?
If you fail to start the engine on the first try, do not despair. Shift into neutral, brake, depress the clutch again, shift into second gear and try again. Sometimes it takes 3-4 swinging cycles to warm up the spark plugs and achieve a flash.
Dangers and risks for the car
Despite the popularity of the method, it carries certain risks for the technical condition of the machine. A sharp jerk when throwing the clutch creates a shock load on the elements transmissionsincluding clutch disc, pressure plate and flywheel. Frequent use of this method can lead to premature wear of the friction linings.
The method is especially dangerous for engines with a timing belt drive. When jerking, the inertia of the heavy pistons can turn the crankshaft faster than the camshaft can be turned by the belt. This leads to desynchronization of valve timing and, in the worst case, to valve bending.
| Risk type | Consequences | Probability |
|---|---|---|
| Damage to timing belt | Bent valves, broken belt | Medium (depending on wear) |
| Clutch wear | Slipping, jerking at start | High with frequent use |
| Catalyst damage | Clogging of honeycombs with unburnt fuel | High with multiple unsuccessful attempts |
| Battery discharge to zero | Inability to charge with generator | Low (generator starts immediately) |
⚠️ Attention: Do not try to push start a car with an automatic transmission (automatic transmission), variator (CVT) or robotic gearbox (DSG, AMT) without special training. In most cases, this will lead to expensive repairs to the valve body or clutches.
Why can't you start an automatic transmission or a variator?
Owners of cars with automatic transmission People often wonder: can this method be applied? The answer is categorical - no. In a classic automatic transmission, the connection between the engine and the wheels is through a torque converter and fluid (oil). The pump that creates oil pressure is located on the engine shaft. If the engine is not running, there is no pressure and the clutch packs are not compressed - wheel rotation is not transmitted to the engine.
Trying to start a CVT or robot from a pusher can end in disaster. In variators (CVT), when the wheels rotate at high speed without a working oil pump, dry friction of the cones and belt occurs, which leads to their instant destruction. In robots (robotic gearboxes) the clutch actuators or mechatronics can be damaged.
The only exception is some older automatic transmission models, which provide the ability to tow for starting, but even there they require acceleration to 30-40 km/h, which is unsafe in urban conditions. For modern cars with automatic transmission, the only options are lighting a cigarette from another car, charging the battery or calling a tow truck.
For vehicles with an automatic transmission, CVT or hybrid installation, the push start method is not applicable and can lead to irreversible damage to the transmission.
Alternative ways to start the engine
If there is no one to push the car, and the terrain is flat, it is worth considering other options. The most reliable is to use a starting device (booster). This is a compact lithium-polymer battery that connects to the terminals of the standard battery and provides the necessary current for the starter to operate.
The second option is to “light it” with wires from another car. It is important to observe the polarity and connection sequence so as not to burn the electronics. The third method, suitable only for cars with an injector and a working but dead battery, is to start from “acceleration” on a descent without using a gear (only for experienced ones), but it is less effective.
There are also special “Quick Start” sprays for starting in cold weather, but they only help if the problem is poor mixture formation, and not a lack of starter rotation. Remember that regular push starting is an emergency measure and not normal operation.
⚠️ Attention: After a successful push start, do not turn off the engine immediately. Let it run for at least 20-30 minutes or drive long enough to allow the alternator to partially charge. battery.
Frequently asked questions (FAQ)
Is it possible to damage the engine if you often start the car with a pushrod?
Yes, frequent use of this method leads to accelerated wear of the cylinder-piston group parts due to operation without proper oil pressure in the first seconds, and also increases the risk of the timing belt jumping.
What gear is best to start a car?
Second gear is considered optimal. It provides a balance between required cranking force and rotational speed, reducing the risk of sudden jerking and damage to the transmission.
Will a push start help if the timing belt is broken?
No, if the timing belt is broken, the camshaft will not rotate, spark and fuel delivery (at the right time) will be disrupted. The engine will not start, and attempts may make the damage worse.
Do I need to depress the clutch when starting from a pushrod?
Yes, the clutch must be depressed during acceleration so that the car can gain speed. You need to throw it sharply at speed to transfer torque to the engine.
Will the battery be charged after a push start?
Yes, immediately after starting the generator begins to produce current. However, to fully charge a deeply discharged battery, a long trip will be required, preferably on a highway at constant speed.