Why does the starter crack when starting the engine: fault diagnosis

The situation when you turn the ignition key, and instead of a vigorous rotation of the crankshaft, you hear only an obsessive and frightening crackling sound, is familiar to many car enthusiasts. This sound can range from a dry, rapid clicking sound to a loud, metallic clanging sound that literally shakes the hood. At this point it becomes obvious that starting the engine in normal mode is impossible, and the car will not go anywhere.

The reasons for this behavior of the starting device may lie either in a banal lack of energy for scrolling or in a serious mechanical breakdown of the internal components. Starter is a complex electromechanical unit, and its failure often comes as a complete surprise. It is important not to panic, but to consistently check the main components to understand why bendix does not engage or retain engagement.

In this article, we will look in detail at why the characteristic cracking noise occurs, how to distinguish an electrical problem from mechanical wear, and whether it is possible to start a car using a pushrod in such a situation. Competent diagnostics will help you avoid unnecessary expenses on tow truck and service station services, allowing you to make the right decision on repair or replacement of the unit.

The main reasons for the starter crackling when trying to start

The first thing that comes to mind when you hear a crackling sound is a low battery. However, if the dashboard lights are bright and the starter makes dry clicking sounds or a rapid clicking sound, the problem may be deeper. Often the culprit is solenoid relaywhich cannot keep the Bendix gear in mesh with the engine flywheel. When the relay contacts close, the bendix extends, but due to insufficient force or wear, it immediately bounces back, opening the circuit.

Another common reason lies in mechanical wear of the teeth. If on gear bendix or the teeth on the flywheel crown are licked or broken, engagement becomes impossible. The gear hits the flywheel, producing a characteristic metallic clang. It is also impossible to exclude poor ground contact or oxidation of the terminals, due to which the current simply does not reach the windings in the required volume.

In some cases, the cracking noise is caused by the destruction of the bushings (sliding bearings) of the starter shaft. If the shaft is skewed, the armature can hit the stator walls, creating resistance and noise. It is important to understand that starter motor at this moment it may not rotate at all, but only twitch, trying to overcome a mechanical obstacle.

• ⚡ Weak battery charge or terminal oxidation, which does not allow you to develop the required force.
• ⚙️ Bendix and flywheel teeth are worn or broken, preventing engagement.
• 🔌 Malfunction of the retractor relay, which does not hold the gear.
• 🔩 Destruction of the shaft bushings or breakdown of the planetary gearbox inside the housing.

⚠️ Attention: If you hear a crackling noise, do not try to turn the starter for more than 5-7 seconds continuously. This can lead to overheating of the windings, melting of the wiring, or even a fire. Let the node cool down between attempts.

Diagnostics of the battery and electrical circuits

Before removing the starter, it is necessary to rule out power problems. Even if the indicators on the panel are lit, the starting current may not be sufficient. The starter requires enormous energy at the moment of start, and the slightest drop in voltage below 9-10 Volts causes the solenoid relay to operate intermittently, making a crackling noise. Check the voltage at the battery terminals under load by asking an assistant to turn the starter.

Particular attention should be paid to contacts. Oxidation of battery terminals, as well as poor ground contact (negative wire) with the body or engine, creates high contact resistance. The current cannot pass freely, and the starter “chokes”. Clean the contacts until they are shiny and check that the bolts are securely tightened. Often the problem is solved by simply stripping the ground wire running from the battery to the body.

If everything is fine with the battery and terminals, check the power wire going directly to the starter. It could overheat, melt or oxidize at the junction. Using a multimeter will help identify voltage drops in different parts of the circuit. Electrical diagram startup must ensure an unhindered supply of current, otherwise no mechanics will work.

Malfunctions of the retractor relay and bendix

The solenoid relay is an electromagnet that performs two functions: it pushes the bendix gear forward and closes the heels to supply power to the electric motor. If the contacts inside the relay are burnt or the return spring is weakened, the gear will constantly “jump” without fully engaging. It is this process that is accompanied by frequent crashing sounds. Repairing a relay is often possible by replacing the contact group, but sometimes a complete replacement of the assembly is required.

The Bendix (overrunning clutch) transmits rotation from the starter shaft to the engine flywheel. Inside it are rollers or wedges that normally jam, transmitting torque. If the mechanism is worn out, the bendix slips. You hear squealing and crackling noises, the starter spins wildly, but the engine stays still. This is a sure sign that overrunning clutch requires replacement.

It is also worth inspecting the Bendix gear itself. If the teeth are “licked” or chipped, they will not be able to engage the flywheel. As a result, when you try to start, the metal gear hits the flywheel teeth. Not only does this make a terrible noise, but it can also permanently destroy the flywheel crown, which will require expensive engine or transmission repairs.

How to check bendix without removing the starter?

You can try to close the nickels of the solenoid relay with a screwdriver (being careful!). If the starter starts to rotate with a characteristic slipping sound (buzzing), and the bendix does not fly forward or spins, the clutch is faulty. If the bendix flies out, but a cracking sound is heard, the problem is in the teeth or retractor.

Mechanical damage and wear of internal components

Inside the starter, especially in geared models, there is a plastic gear that can crack or wear out over time. If it falls apart, the starter motor will work, but rotation will not be transmitted to the bendix shaft. In some cases, broken gears can jam the mechanism, causing cracking and buzzing noises. This can only be determined after removing and disassembling the device.

The bushings (sleeve bearings) in which the armature shaft rotates wear out over time. Backlash appears, the shaft warps, and the armature begins to rub against the stator magnets. This causes a lot of noise, crackling and loss of power. If you start the situation, the armature can melt the winding or jam tightly. Replacing bushings — the procedure is inexpensive, but requires special tools for pressing.

Don't forget about the flywheel crown itself. If the starter worked for a long time with a worn bendix, it could “eat” the flywheel teeth. In this case, replacing the starter will not help - the crackling noise will remain. Sometimes it helps to crank the engine manually (if the design allows) or push the car so that the flywheel turns and engagement occurs in the remaining place.

Symptom	Probable Cause	Character of sound	Solution method
Quiet crackling, the lights go out	Battery discharged	Fading crackling	Charging or “lighting up”
Loud clanging noise, starter won't turn	Retractor faulty	Frequent clicks	Replacing a relay or starter
Squealing and crackling, the engine does not turn	Bendix slips	High frequency screech	Replacing the overrunning clutch
Metal scraping	Gear teeth licked	Loud clang of metal	Replacing the bendix or crown

The effect of low temperatures on engine starting

In winter, the problem of starter chatter gets worse. In cold weather, the engine oil thickens, creating enormous resistance to cranking. The starter requires maximum current, which a frozen battery cannot produce. As a result, the voltage drops, the solenoid relay begins to “click”, and you hear a crackling sound. Warming up the battery (by turning on the headlights for a couple of minutes) sometimes helps to start the engine.

Also, during the cold season, condensation may freeze inside the starter itself if moisture gets there. Ice can block the movement of the bendix or create additional resistance. Planetary gearbox, the lubricant in which has thickened, may also not transmit force, causing slippage and noise. In such cases, placing the car in a warm garage often helps.

Sharp jerks of the starter when trying to start head-on can lead to breakage of plastic elements or even destruction of the aluminum gearbox housing. If the car does not start after 3-4 attempts, it is better to stop experimenting and look for the reason.

Is it possible to start a car if the starter is cracking?

If the starter crackles but does not turn, it is usually impossible to start the car with the key. However, if you have a manual transmission (Manual transmission), the option of launching “from a pusher” or on a cable remains. To do this, you need to turn on the ignition, depress the clutch, engage second or third gear, accelerate the car (pushing or towing) and smoothly release the clutch. The engine will spin up from the wheels and start.

For vehicles with automatic transmission (Automatic transmission) this method is strictly prohibited, as it can lead to fatal transmission failure. Owners of the machines can only look for an electrical fault or call a tow truck. Sometimes gently tapping the starter body (for example, with the handle of a hammer) helps - this can temporarily restore contact in stuck brushes or move a jammed armature, but this is only a temporary measure.

If the crackling noise is caused by slipping of the bendix, and the engine was started from the pushrod, the car cannot be turned off until repairs are made. Restarting with the starter may no longer be possible. You should also be prepared for the fact that a faulty starter may completely jam, blocking the engine.

⚠️ Attention: A push start on modern cars with sophisticated electronics and catalytic converters does not always go smoothly. Unburned fuel can burn out in the exhaust system, which is dangerous for the catalyst. Use this method only as a last resort.

Prevention and proper care of the starting system

To avoid trouble starting, you need to regularly monitor the condition of the battery. Clean terminals and secure fixation of wires are the key to a long life of the starter. Do not allow the battery to be deeply discharged, as this will sulfate the plates and reduce the starting current. Check the tension of the alternator belt to ensure the battery is always charged.

When the first signs of “sluggish” rotation of the starter or extraneous sounds appear, do not delay diagnosis. Timely replacement of bushings or cleaning of the brush assembly will cost several times less than buying a new starter or repairing a flywheel. It is also recommended to periodically check the security of the starter itself to the engine block - vibration can loosen the bolts, which will lead to misalignment.

Use high-quality maintenance lubricants designed for high temperatures. Ordinary lithol can freeze in the cold, and when heated, it can leak, leaving the rubbing parts without protection. Proper care will extend the lifespan starting systems and will ensure a confident engine start in any weather.

How to extend the life of a starter?

Do not turn the starter for more than 10 seconds. Give him a rest between attempts. Do not use the starter to hold the car on a slope (if it suddenly stalls) - this creates a colossal load on the gears.

Why does the starter click but not turn over even though the battery is new?

If the battery is guaranteed to be in good working order and charged, the problem lies in the starter itself or the wiring. Most often, the “nickels” inside the solenoid relay burn out, or the brushes of the electric motor are worn out, which do not transmit current to the armature. A break in the armature or stator winding is also possible.

Is it possible to repair the starter yourself?

Basic repairs, such as replacing the solenoid relay, bendix or brushes, are quite accessible to the owner with minimal skills and a set of tools. However, replacing the bushings requires a special puller and pressing, and diagnosing the windings requires the presence of a stand. It is better to entrust complex cases to a pro.

How much does it cost to replace a starter on average?

The cost depends on the car brand and region. Replacement work takes from 30 minutes to 2 hours. The price of a new unit varies from 3 to 15 thousand rubles and more. Restoring an old one (repair kit) usually costs 40-50% of the price of a new one.

Is starter noise dangerous for the engine?

The sound itself is not dangerous, but the cause that causes it can be harmful. If the bendix does not engage and hits the flywheel, the ring gear teeth can be damaged. This will lead to the fact that it will become impossible to start the engine even with a working starter, since the gear will have nothing to catch on.

What to do if the starter is stuck and won’t turn over?

If the starter makes one loud click and stops talking, it may be stuck. Try gently tapping the case. If this does not help, remove the terminal from the battery to avoid a fire, and try to turn the engine manually using the crankshaft pulley (if possible). Further actions are only removing and troubleshooting the starter.