Kickstarter crunching on Nissan Alpha: Complete troubleshooting guide

Introduction to the problem

The sounds the starter makes when trying to start the engine are often the first warning sign of an impending serious problem. If you hear a characteristic metallic crunch when you turn the ignition key on your Nissan Almera, this is not just an unpleasant noise, but a direct indication of mechanical damage to the launch units. Ignoring this problem can lead to the fact that the car simply stops starting at the most inopportune moment, leaving you on the side of the road.

Situation with crispy starter on Nissan Almera (often popularly called “Alpha” due to consonance or confusion with other models) has its own specific features due to the design of the engine and the starting device itself. In most cases, the problem lies in incorrect engagement of the Bendix gear with the engine flywheel. It is important to understand that the sound of metal rubbing against metal means the teeth are destroyed, and every second the starter operates in this mode increases the cost of repairs.

In this article, we will analyze in detail why such a defect occurs, which components fail most often, and how to correctly diagnose it yourself. We will not limit ourselves to general phrases, but will provide specific technical data and action algorithms that will help you save time and money on a visit to the service center.

Mechanical causes of crunching and gear wear

The main reason for the appearance of crunching is a violation of the geometry or integrity of the gears. In the engine starting system Nissan Almera plays a key role bendix (overrunning clutch), which pushes the gear forward to interact with the flywheel. If the teeth on the Bendix gear or flywheel ring are worn, broken, or burred, they may not engage smoothly. Instead, an impact collision and slipping occurs, which gives rise to that very unpleasant crunch.

Often the problem is aggravated by insufficient lubrication or, conversely, dirt getting into the mechanism. Starter gear should rotate freely, but at the same time be firmly fixed when transmitting torque. When the starter armature shaft bearings wear out, the gear begins to “walk” and hit the flywheel without getting into gear. This is especially true for cars with high mileage, where the metal resource has already been exhausted.

Еще одним фактором может быть деформация самого корпуса стартера или его крепления. If starter mount ослабло, вал может смещаться по оси, из-за чего шестерня выходит не на ту глубину. As a result, some of the teeth hit the edge of the flywheel, causing a grinding noise. Регулярная проверка затяжки болтов крепления может предотвратить многие серьезные поломки.

• 💥 Bendix teeth wear - the most common reason requiring replacement of the overrunning clutch or the entire starter.
• 🔩 Loosening fasteners — leads to a displacement of the axis of rotation and incorrect engagement with the flywheel.
• 🛢️ Lack of lubrication - leads to increased friction and accelerated wear of the moving parts of the mechanism.

Problems with solenoid relay and plug

A crunching sound does not always mean that the problem is in the gears. Often the culprit is solenoid relay, which is responsible for extending the bendix. If the relay does not fully extend the gear or does it jerkily, the teeth do not have time to align before rotation begins. At this moment, the engine is trying to crank the crankshaft, but the gear has not yet settled into place, which causes a strong metallic grinding noise.

The important element here is pusher fork (lever), which mechanically connects the relay to the bendix. Over time, the plastic of the fork cracks or breaks, and the metal parts wear out. If the fork has play, it cannot provide a tight and full gear travel. As a result, you hear the characteristic "click" of the relay, followed by a crunching sound as the gear only lightly contacts the flywheel.

Sometimes the problem lies in the electrical part of the relay control. If the voltage across the relay coil drops, it may not operate correctly. However, if at the same time you hear a mechanical crunch, and not just clicks, then the problem is almost certainly in the mechanics of the drive. Check battery voltage and terminal conditions should be the first diagnostic step, but not the only one.

⚠️ Attention: If you hear a crunching noise, do not try to start the engine repeatedly within a minute. This will lead to rapid destruction of the flywheel crown, the replacement of which will require removal of the gearbox and will significantly increase the cost of repairs.

DIY fault diagnosis

For accurate diagnosis, it is necessary to visually assess the condition of the starter and its environment. First remove the battery terminal for safety, then unscrew the fasteners starter and carefully remove it from the engine compartment. Inspect the bendix: the teeth should be smooth, without signs of chips or heavy wear. Check how the gear moves along the shaft splines - the movement should be smooth, without jamming.

Pay special attention to checking the solenoid relay. Try manually pressing the fork lever and turning the bendix. It should rotate in one direction and lock in the other. If it turns both ways or is too tight, this is a sign of a problem. overrunning clutch. Also check the integrity of the plastic fork - there should be no cracks on it.

If the starter is removed, be sure to inspect the engine flywheel through the hole in the clutch housing. Use a flashlight to see the crown teeth. If you see that the teeth are worn down on one side or completely missing in a certain area, the problem may be there. In this case, replacing the starter alone will not solve the problem, since the new gears will quickly fail due to a damaged flywheel.

Remedies and repair work

Depending on the identified cause, there are several ways to solve the problem. If damaged only bendix, you can replace the overrunning clutch separately, which is a more economical option. However, on many models Nissan Almera Bendix comes complete with an armature or housing, so sometimes you have to change the entire assembly. When replacing, be sure to use high-quality spare parts, since cheap analogues often have weakly hardened teeth.

If the problem is with the solenoid relay, it can also be replaced separately. To do this, you need to unscrew the bolts securing the relay cover and replace the coils and contacts. But if the relay operates normally, but the fork is broken, the fork or the entire drive mechanism will need to be replaced. If the flywheel ring wears out, the repair becomes more complicated: it is necessary to remove the gearbox, dismantle the flywheel and either replace it entirely, or turn it over (if the design allows) or grind the teeth, although the latter option is considered a temporary measure.

During assembly, all friction surfaces must be lubricated with a special high temperature grease for starters. Do not use lithol or grease, as they may leak or thicken in the cold. Also check the condition of the starter brushes - if they are worn to the limit, even a working Bendix will not be able to crank the engine with the required force.

What to do if it is not possible to remove the starter?

If it is impossible to remove the starter, you can try gently tapping the solenoid relay housing with a hammer while attempting to start. This sometimes helps to mechanically move a stuck fork, but this is a temporary measure only to get to the service station.

• 🔧 Bendix replacement - the cheapest method of repair for local gear wear.
• ⚙️ Replacing the plug — necessary for mechanical damage to the drive lever.
• 🚗 Flywheel repair - a complex process that requires removal of the gearbox, but is mandatory when the crown wears out.

Comparison of the cost of repair and replacement of a unit

Many car owners doubt whether it is worth repairing the old starter or whether it is better to buy a new one. Repairs including replacement of the bendix and fork usually cost much less than purchasing a new original unit. However, the quality of remanufactured parts may be poor. If you plan to drive the car for a long time, sometimes it is more profitable to install a new starter to avoid repeated breakdowns after several thousand kilometers.

Below is a table with approximate prices for spare parts and labor (prices may vary depending on the region and exchange rates):

Type of work / Spare part	Approximate cost (RUB)	Complexity of work
Replacing bendix (materials)	1500 - 3000	Average
Replacing the solenoid relay	1000 - 2500	Low
New starter (analogue)	6000 - 9000	Average
New starter (original)	15000 - 25000	Average
Replacing the flywheel crown (work)	8000 - 15000	High

Please note that the work involved in removing and installing the starter is Nissan Almera usually does not take much time if there are no additional obstacles in the form of protective screens or tubes. However, replacing a flywheel requires significant labor, which is reflected in the final cost of the repair.

⚠️ Attention: Replacing the flywheel crown requires removing the gearbox, which makes this type of repair the most expensive and time-consuming. If the crunching occurs due to wear on the flywheel, and you simply replace the starter, the new gear will very quickly break on the damaged ring.

Prevention and operating tips

To avoid repeating the situation with a crispy starter, you need to follow a few simple operating rules. First, do not hold the key in the "start" position for more than 10-15 seconds. If the engine does not start the first time, let the starter cool for at least a minute. This will prevent overheating of the windings and deformation of parts.

Check the condition of the battery regularly. A weak charge prevents the retractor relay from fully extending the bendix, which leads to the teeth hitting the flywheel. In winter, before attempting to start, you can turn on the low beam headlights for 30 seconds to warm up the electrolyte in the battery, and then turn off and try to start the engine.

It is also important to monitor the condition of the wiring. Oxidized or loose contacts create a voltage drop, causing the starter to not operate at full capacity. Cleaning the terminals and lubricating the contacts will protect you from many starting problems in the cold season.

Frequently asked questions (FAQ)

Why does the starter crunch only when it’s cold?

When cold, engine oil thickens, creating high resistance to crankshaft rotation. The starter may not be able to cope with the load, and the gear begins to slip, causing a crunching noise. Also, at low temperatures, the fork plastic becomes more brittle and may not provide full travel.

Is it possible to drive if the starter sometimes crunches?

Strongly not recommended. Every crunching sound is a blow to the flywheel teeth. You risk completely destroying the flywheel crown, which will lead to the need to remove the gearbox and costly repairs.

What should I do if the crunching noise remains after replacing the Bendix?

This means that the problem is not in the bendix. The flywheel crown may be worn, the fork may be broken, the starter mount may be loose, or the solenoid relay may be faulty. A comprehensive diagnosis of all components of the starting system is required.

How to distinguish the crunch of a Bendix from the crunch of a flywheel?

If a crunch is heard immediately after turning the key and is accompanied by the gear turning idle, the problem is in the Bendix. If the sound is duller and occurs when you try to crank the engine, but the gear does not rotate, the flywheel crown may be damaged.

Do I need to replace the entire starter or can it be repaired?

If the starter housing is intact, and only consumable parts (Bendix, brushes, fork) are worn out, repair is advisable. If the housing is cracked or the anchor is burnt, it is better to replace the entire assembly.