How to tighten the motor chain of a Cobalt car. Changing the timing chain on a Chevrolet Cobalt with your own hands

The Chevrolet Cobalt has an engine with a displacement of only 1.5 liters. Motor power Chevrolet Cobalt 105 hp Other powertrain options available budget sedan Cobalt is not offered in Russia.

The main feature of this Chevrolet Cobalt engine is the presence timing chains. A timing chain is much more practical than a belt, plus it requires less attention. The S-Tec series engine was specially developed for emerging markets with harsh operating conditions. Photo of the engine is just above. Petrol 16 valve The GM Powertrain S-Tec III is combined with both a 5-speed manual transmission and a modern 6-speed automatic transmission, which we will discuss below. In the meantime, detailed Chevrolet Cobalt engine characteristics.

Engine characteristics Chevrolet Cobalt 1.5 B15D2

• Working volume – 1485 cm3
• Number of valves/cylinders – 16/4
• Timing drive – chain
• Ecological class – EURO 5
• Gas distribution mechanism - DOHC
• Supply system - distributed injection fuel
• Power – 105 hp/78 kW. at 5800 rpm
• Torque – 134 Nm at 4000 rpm
• Maximum speed – 170 (manual transmission5) and 163 (automatic transmission6) kilometers per hour
• Acceleration to the first hundred – 11.7 (manual transmission5) and 14.1 (automatic transmission6) seconds
• Fuel consumption in the urban cycle – 8.4 (manual transmission5) and 10.4 (automatic transmission6) liters
• Fuel consumption on the highway – 5.3 (manual transmission5) and 5.9 (automatic transmission6) liters
• Fuel consumption in the combined cycle – 6.5 (manual transmission5) and 7.6 (automatic transmission6) liters

As for the transmission, then main feature budget Chevrolet Cobalt is the presence of a 6-speed automatic. Chevrolet automatic transmission Cobalt is a GM 6T30 assembled in Korea. Photo of automatic transmission Chevrolet Cobalt below.

Fuel consumption with automatic in the city, the Chevrolet Cobalt, even with a very modern automatic transmission, exceeds 10 liters. For this reason, on the highway the sedan can boast of very moderate consumption, just under 6 liters.
Concerning acceleration of Chevrolet Cobalt with automatic transmission, then the car accelerates to hundreds in more than 14 seconds. Naturally, the power unit with a mechanical, albeit 5-speed, transmission is more dynamic.

Today the difference in price for a Chevrolet Cobalt with automatic and manual is 59 thousand rubles. Moreover, in the cheapest Cobalt configuration there is no air conditioning, but the same version, but with automatic transmission, already has air conditioning. Another incentive to buy a car with an automatic transmission.

This is due to the fact that our climate is not designed for the operating conditions specified in the regulations Maintenance. Severe winters and constant temperature changes in spring and autumn can significantly reduce the life of the timing belt. Ultimately, if timely inspection is launched, the consequences of repair can be several times higher than the cost of a conventional replacement, up to cylinder head repair.

Price:

Where to change in St. Petersburg:

If the Chevrolet Cobalt is equipped not with a belt, but with a chain, then it runs significantly longer than the belt. On average 150-300 thousand km. This is due to the fact that the chain wears out much longer than the belt. But despite this, it also requires checking at least every 70-80 thousand km. The fact is that the chain is not so noticeable, but it still stretches over time and this can lead to jumping one tooth, which will also lead to dire consequences.

The advantages of a timing belt drive are that the cost and maintenance of such a motor is lower than that of a chain motor. But at the same time, chain motors may not operate a little louder than those equipped with a belt drive.

Main features:
- wear of the belt surface;
- visible cracks, especially when bending;
- oil stains;
- other defects that should not be on the belt.

In most cases, we also recommend changing the water pump and checking the coolant and oil in the engine. The need to purchase rollers, tensioners, dampers, etc. determined by the mechanic during operation or at the diagnostic stage.

Diagnostics during repairs are free with us!

If the car is not drivable, we can send a tow truck.

The Chevrolet Cobalt model has become very common and popular among car enthusiasts. This is explained by performance characteristics cars are on high level. The machine is durable, and therefore has almost no problems with repairs. If you really need reliable car, then you should pay attention to Cobalt. One of the features of this vehicle is that it has a timing chain installed in it.

Features of the power unit on the Chevrolet Cobalt

Chevrolet Cobalt with timing chain and gas system.

Two types of power units can be installed on a car. Their main difference from engines of other Chevrolet brands is the timing drive. Cars in our country are delivered mainly with a chain, but in Europe you can also see cars with a belt. We also have such cars, but they are mostly imported from abroad. There are relatively few of them, and therefore this article will focus specifically on the features of machines with a timing chain.

Chevrolet Cobalt is installed Gas engine GM Powertrain S-Tec III.

Advantages of the timing chain mechanism

To the advantages chain drive mechanism is that the service life of such motors is long. The manual shows that the chain can last a minimum of 250,000 kilometers.. Thanks to this, such a unit costs less to maintain when compared to a belt drive. It will need to be repaired after 60 000 kilometers run.

When to pull up?

Also, do not forget that the chain can stretch over time, and therefore you will need to constantly monitor its condition. This will make it possible to avoid problems and save on repairs.

It is important to remember that the chain must be tightened every 70–80 kilometers run.

When to change the chain?

It must be replaced when the engine noise increases and a rumble appears in the area engine compartment when dialing power unit rpm If the chain is not tensioned in time, then it will have to be completely changed later..

If there is increased noise, the timing chain should be replaced.

Timing chain selection

Before carrying out work on replacing the chain, it is worth choosing it correctly. It's easy to do. Since the engine does not have many modifications, there is no need to carefully select such a part. At the market or in a store, you can choose only one chain for Cobalt.

However, some rules should be followed when purchasing. Among them are::

1. You should only buy from time-tested sellers.
2. You should not purchase chains from an unknown manufacturer.

These rules are basic, and therefore they should be followed so as not to create additional problems for yourself. Also, repair kits should be purchased only original ones. They can also be contractual.

When replacing a chain, you should also change all the sprockets.. Such parts are also subject to wear. In order for the parts to fit well, they must be purchased as a set.

When replacing the timing chain, the sprockets should also be replaced.

Replacing the timing chain on a Chevrolet Cobalt

You can change the chain yourself, without going to a service station. Before work, the car must be properly prepared. His Be sure to put the handbrake on and remove the battery. You also need to remove the air filter and the cover on the head.

FUNCTIONAL PURPOSE OF THE TIMING CHAIN

The Chevrolet Cobalt timing chain drive is part of the gas distribution mechanism and is involved in the transmission of torque from crankshaft to the distribution one. The chain can connect them directly or participate in the work indirectly, for example, combining camshafts with each other, if there are two of them, while functional purpose it remains unchanged.

Monitoring the condition of the timing chain, replacing dampers and tensioners is part of routine vehicle maintenance and plays an important role in engine operation. vehicle. It is necessary to regularly monitor the condition of the gas distribution system, as this directly affects the vehicle’s power, sensitivity when supplying gas and fuel consumption.

FEATURES OF CHAIN ​​REPLACEMENT

In most engines of older car models, chains with roller links were used to transmit torque, often the components were in two or three rows, this made the timing chain a very reliable, almost eternal mechanism that does not require constant maintenance. Often the car traveled up to 300,000 km. and the chain of the mechanism received only lateral play, and the worst thing that could happen to the gas distribution mechanism was the links jumping; breaks were extremely rare. Over time, production price, efficiency, environmental friendliness and the weight of the car engine, which affects its power, have become trends in the creation of cars. Under these conditions, manufacturers began to strive to replace the timing chain with a lighter, cheaper and easier to maintain timing belt. And those motors whose design retained chains and roller components were replaced with lightweight plate links, more reliable than timing belts, but still not as strong as roller chains.

The Chevrolet Cobalt timing chain has a number of features that fundamentally distinguish it from the timing belt.

1. The chain is a durable mechanism; it wears out much longer than the timing belt; breaks do occur, but much less frequently than in belt-driven engines.

2. A break in the timing chain occurs quite rarely, which means engine breakdown, which requires expensive overhaul, does not occur often.

3. Timing chains are quite noisy, but with the modern level of car noise insulation, this parameter becomes not very important.

4. When the chain wears out, its play and lateral runout occur, this indicates the need to replace the old chain with a new one. Since the metal part sagging and lateral runout is accompanied loud noise, which is simply impossible not to notice and not to attach significance to. A noise under the hood will be the first “bell” indicating the need for vehicle maintenance.

5. The main disadvantage of replacing the Chevrolet Cobalt timing chain is that it is located inside the cylinder block and it is quite difficult to assess its condition without training and experience. In addition, dismantling and replacement, with such a device, is a long and labor-intensive process, and therefore expensive.

6. Tensioners and dampers are involved in the operation of the timing chain - these are consumable parts that wear out quickly and require more frequent replacements than the timing chain itself.

TYPES OF FAULTS

1. Timing chains, when in full working order, have a natural movement, which is compensated by tensioners when oil pressure is applied. A malfunction is considered to be a strong lateral runout of the timing chain, which appears when the links are stretched. The actual degree of chain stretch can only be determined through a qualified inspection of the gas distribution mechanism.

2. Backlash is a direct stretching of the chain, which is observed during long-term operation, can lead to jumping of chain links and malfunction of the gas distribution mechanism, this leads to a decrease in the sensitivity of the engine when the gas pedal is pressed and an increase in fuel consumption.

3. Broken timing chain of Chevrolet Cobalt is the most dangerous damage to the engine; in the case of a chain drive motor, it does not occur often, but it does occur. If such a malfunction occurs camshaft ceases to be associated with crankshaft and can stop completely arbitrarily in a position in which any of the valves of the gas distribution mechanism is open. In this case, the piston, moving upward, may collide with the valve, which will lead to its deformation and the car engine will face serious repairs. It should be noted that a timing chain break does not occur unexpectedly; it is almost always accompanied by changes in the operation of the vehicle, a decrease in its power, a change in gasoline consumption and the appearance of extraneous noise.

To prevent and prevent the operation of the gas distribution mechanism, it is necessary to periodically troubleshoot the timing chain; this will save the car engine from breakdown, prevent premature engine wear and increase its service life.

CAUSES OF WEAR

1. Operation of the Chevrolet Cobalt car in extreme conditions. Frequent driving on unpaved roads, towing trailers, heavy loads, traveling on higher speeds leads to an increase in the load on the crankshaft, spinning it to maximum speed, which leads to stretching of the timing chain.

2. Since the timing chain is located inside the cylinder block, it is completely washed motor oil and as a result is very sensitive to its quality. In the case of using high-quality synthetic oil containing specialized detergent additives, the service life of the timing chain is significantly increased

3. The operation of the timing chain involves parts that regulate the tension of the chain; they are consumables and require periodic replacement. During vehicle maintenance, it is necessary to check the degree of wear of the tensioner and damper, untimely replacement These parts may cause the chain to stretch and links to jump.

SIGNS OF PROBLEM

1. Increase in gasoline consumption by car;

2. Reduced engine power; 3. The appearance of clanging and noise under the hood of the car when the engine is running;

4. A complete stop of the car while moving; when you try to start, the engine does not start, and the starter rotates more easily than usual;

5. Unstable operation Chevrolet engine Cobalt on Idling and in motion;

6. The occurrence of shots in the injector receiver and exhaust pipe.

All these problems may indicate a shift in the valve timing and loosening of the chain tension. If you notice one or more signs of this list on your car, immediately contact a service station for an inspection.

HOW OFTEN DO YOU NEED TO REPLACE THE TIMING CHAIN?

Replacement frequency of any Supplies For Chevrolet cars Cobalt depends on the driving style and operating mode of the car. With an extreme driving style and aggressive use of the vehicle, it is necessary to replace the timing chain as it becomes loose and wears out.

IN normal conditions operation, it is necessary to replace the timing chain as planned, every 100 - 150,000 km. mileage If your car is equipped with an analog belt, replacement must be done a little ahead of schedule recommended by the vehicle manufacturer.

Entrust your car only to professional specialists who are capable of competently troubleshooting the timing chain, assessing lateral runout and play, replacing and adjusting the operation of tensioners, chain drive “precipitators” and replacing the Chevrolet Cobalt timing chain.

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Asks: Yuri Ustinov.
Question:So is it still a chain or a timing belt?

I want to buy a Chevrolet Cobalt. But in our city there are few of them sold. I called one seller, he says that he changed the timing belt. To another, he says that there is a chain on Cobalt and it only needs to be tightened. He did not tighten it, since the mileage is no more than 45,000. He says that it is necessary to tighten it when there is a clattering noise or the mileage exceeds a hundred!

Where is the truth and where is the lie? Is it worth buying Cobalt with a timing chain mechanism?

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Alexey "technical specialist"

I'm just sick of cars. I try to study in detail every car I have owned. I enjoy driving at night on city streets. I try to do my own repairs on my cars!

About the engine

The timing mechanism on the Chevrolet Cobalt is chain.

The engine in the Chevrolet Cobalt is durable and has excellent technical characteristics.

As a result, the motor is quite inexpensive to repair. Its also special feature is that It has a timing chain, not a belt. .

Advantages of the chain mechanism

Since the chain is more reliable, it can last longer than a belt.

Chain replacement kit.

It will have to be changed after 250,000 kilometers.

But it is worth remembering that it needs to be tightened periodically . It is recommended to do this every 70–80 thousand kilometers mileage

Disadvantages (increased noise)

Features of chain replacement

New chain up close.

Replacement is made only complete with rollers. If you tension the chain on time, it will last for a long time.

Choosing it will also not be difficult, since there are few engine modifications in Cobalt that are intended for use in domestic conditions. To buy a chain, you should visit only specialized stores. You should buy only from time-tested sellers in order to save yourself from unnecessary hassle and costs.