Delrin is a polyoxymethylene acetal plastic (POM). It is known for its tolerance, toughness, rigidity, and strength, which makes it a good material for the bearing balls. But traditionally, they are not as popular as steel ball bearings.

Since this is such a serious problem and it is still a big unknown to many car owners, this article will explain to you what you must know about timing chain failure symptoms before it gets broken completely.

Stainless steel balls are used because they have higher chromium content, which makes them more resistant to surface corrosion. Chromium reacts with oxygen and a chromium oxide layer is formed on the surface.

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But before we talk about timing chain problems, let us explain what exactly this component is. The timing chain is the engine part that coordinates the opening and closing of the valves inside a combustion engine. By syncing the camshaft and crankshaft to open and close these valves, the timing chain ensures that the engine pistons do not hit the valves.

The constant movement through guides and hubs leads to a bad timing chain that gets stretched too much. You will notice an increase in fuel consumption and reduced power at low speeds. You will also hear a rattling sound when you pop up the hood. The noise varies as you change speeds.

If you suspect BMW timing chain problems, don’t wait any longer but bring your prized vehicle to us. We are here for all European car owners in:

On average, you should come to our auto repair shop for timing chain replacement after each 80,000 – 120,000 miles driven. However, you must bring your car for an inspection if you notice any of the symptoms of the bad timing chain described above. The cost to replace it on time is nothing compared to the risk of a car crash if it fails.

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Before you notice timing chain tensioner failure or experience a broken chain, here’s how to tell if the timing chain is bad:

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The fact is that without the BMW timing chain working properly, your prized vehicle is not safe to drive. If it happens to fail while you are driving, you are in great danger. Your car will stop in the middle of oncoming traffic, and you risk getting hit before you can safely get out of the car and walk to the side of the road.

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This type of chain looks very much like the one you find on a bicycle. But, of course, it is made much more durable and resilient. Cars with a smaller engine capacity have a single roller chain. More powerful engines require a double chain.

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We now know how the device looks. But how does a timing chain work? It runs continuously on sprockets in a circle like a conveyor belt. Its movement is set with great precision to achieve the syncing of the opening and closing of the valves. This translates into a high level of wear and tear, and this is what causes a timing chain to break.

They are made to a specific grade between 2000 and 3, defining to its geometric tolerance. Balls in smaller number have higher precision. Lower grades have fewer defects too, like cuts, soft spots, pits, and flats.

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Do you have a loose timing chain due to a stretch or a too-tight tensioner? There are several symptoms of a bad timing chain to look and listen for. Doing so will prevent getting stuck in the middle of the road with no possibility of moving your car out of the way of oncoming traffic. So, let us detail the most important loose timing chain symptoms and timing chain tensioner being too tight.

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BW Performance is a team of specialists who are truly passionate about European cars. We know how to tell if the timing chain is bad and what to do about it. And we will offer you a fair BMW timing chain replacement cost, together with the guarantee of excellent workmanship.

Stainless steel, which is sometimes also called Inox steel is a steel alloy with 10.5% chromium minimum. This is an extremely corrosion resistance material, which gets even better when molybdenum is added. So there are many stainless steel grades with different molybdenum and chromium content suitable for varying endurance needs. Stainless steel ball bearings are also low maintenance. They provide superior performance.

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The balls are a vital part of bearings. These rolling bodies are located between the outer and inner rings, and the retainer or the cage. The most common ones are the steel ball bearings, such as stainless steel ball bearings, but there are balls made of other materials too. They are in contact with the rings at a single point and make the bearing rotate with little friction. The balls are in different grades, with the precision standards being set by the ABMA (American Bearing Manufacturers Association).

The 440 series steel ball bearings are known for their antifriction properties, and corrosion resistance. So if the application is outdoor it is best to go for stainless steel balls – remember, they are resistant to rust. They are popular in applications where anti-corrosion, and hardness is required.

The balls are also available in different materials. There are steel ball bearings, stainless steel ball bearings, and also those made with plastic or ceramic. The most popular materials for these balls are

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Bearings with balls of ceramics usually have races in steel. The use of silicon nitride makes them good at resisting shocks. They are also harder than metal, so there is reduced contact with the bearing track, which means there will be less friction, and higher speed. Service life of the bearing is also enhances by 3 to 10 times. Bearings with silicon nitride balls are useful where electric or magnetic fields and corrosion prevent the use of metals.

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In time, the timing chain guides will get damaged due to wear and tear. If this is the case, you will hear a clattering or rattling sound, especially when you are driving at low speeds.

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When our auto repair shop specialists get an urgent call for help, it is usually something very serious. In most cases, a car suddenly stops in the middle of the road, and the driver has no idea why. However, after a discussion with the driver, we found out that they noticed something not quite right, but did not pay attention. In fact, they noticed bad timing chain symptoms in the tensioner or other parts of this critical component of the car.

The signs of a bad timing chain are unmistakable in this case. You will hear a loud grinding noise as the chain jumps, and then the engine will stop running.

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These balls have been made from the best quality chrome alloy electric furnace steel and have been hardened well so you get the maximum strength and long service life. Highest dimensional accuracy and surface finish is always achieved. Advanced heat-treating methods and controlled processing add high strength and anti-cracking abilities to these steel ball bearings. They become resistant to contact fatigue too.

As we explained in this article, there is no good answer to how long can you drive with a bad timing chain. You should not plan any other journey before our auto repair technicians look at your engine and fix or replace the timing chain. If the chain fails in the middle of a busy expressway, your life may be at risk.

Thus, when you have a bad timing chain, the crank no longer performs the syncing of the valve opening and closing. The entire combustion process stops, and the driver can no longer operate the car.

One of the loose timing chain symptoms is a rattling noise. If you hear a clattering noise, then you should pull over as soon as possible because the chain is about to break or jump from the idler or tensioner.

A chemical compound, silicon nitride is made of nitrogen and silicon. Si3N4 is more thermodynamically stable, and thus the balls made of this material are more popular. Si3N4 is also more economically relevant.

If you are wondering how long will a stretched timing chain last, the answer is no time at all. At any moment the chain may break, the engine will stop, and you will be unable to operate the car

Whenever the check engine light is on, there is a problem with the engine, and you must not ignore it. This light will also come on in case of a bad timing chain.

Many balls in bearings are also made with chrome steel like 52100 Steel and AISI52100. These balls are present in tools, drills, utensils, and bearings. Its chemical composition has 1.5% chromium and high carbon content. Chromium increases hardness penetration, and also the toughness and wear resistance of steel. There are also traces of sulphur, manganese, iron, silicon, and phosphorous, giving the balls their hardness and exceptional surface characteristics. Chromium on steel has the ability of resisting corrosion and staining. They are also resistant to deformations. However, chrome steel balls are less resistant to wear and abrasion than stainless steel.

Low Carbon Alloy – There is usually a coating here for protecting the material from corrosion. The carbon content here is between 0.05 and 0.30%.

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This is steel where the carbon content is 2.1% by weight. The American Iron and Steel Institute (AISI) says that in carbon steel, there should be no minimum cobalt, molybdenum, chromium, titanium, tungsten, nickel, niobium, zirconium or vanadium or anything else for attaining the alloy effect. Also, the copper content should be 0.40% or less. The maximum content of silicon shouldn’t be more than 0.60, and manganese should be 1.65 or less.

Carbon steel ball bearings are of two basic types – those made of low carbon alloy steel, and those that use medium carbon.

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This is a ceramic material, which provides a very smooth surface and hardness up to Rc78. It is niche and costs more than the stainless steel ball bearings. Ceramic bearing balls are either zirconium dioxide (ZrO2) or silicon nitride (Si3N4).

This type of timing chain is made of precision links made of flat hardened alloy steel. They are connected to each other by pressed pins. This is also known as a silent chain because its shape is designed for smooth operation. We mention this because if you happen to hear noises, then you definitely have timing chain issues.

The material has excellent fatigue endurance as well, and thus the balls made with it are expected to last for a long time. There are other benefits too. POM, for instance, is resistant to moisture, neutral chemicals, and petroleum based solvents, and has good electrical insulating properties. Approved by the FDA, it has low water absorption. It can handle a working temperature up to 150 Deg C.

All these bad timing chain symptoms make you wonder: why does this critical part break? Do timing chains need to be replaced? The answer to the second question is yes. To the first question, the possible causes are:

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Carbon steel balls are used in less expensive anti-friction bearings, casters, trolleys and conveyors, steering columns, toys, drawer slides, and roller skates.

Machinability – The material can be ground, honed, and lapped, or shaped and drilled with an electric discharge machining or ultrasonic cavitation.

The balls made with carbon steel become stronger and harder when the carbon content is higher, and if they are heat treated. But they are less ductile. Higher carbon content also reduces weldability.

Chain idler sprockets type RS-RD-RT. For simple, double and triple chain. There is the plate wheel and the double shielding bearing set up in the centre.

What does a bad timing chain sound like if you have this problem? You will experience the same symptoms as in the case of a stretched chain, plus a whirring sound that gets louder as you increase the car speed.

As we are speaking of timing chain symptoms, do not confuse it with a timing belt. While it serves the same purpose, it is a completely different component and has specific signs of failure.

It would be chromium steel if there is less than 12% of chromium in it. Above this, it would be stainless steel. Steel ball bearings made of chrome are popularly used in the making of mechanical components. BC Precision chrome steel balls used in different types of load-bearing applications like vibratory finishing, food grinding systems, linear motion components, plating baths, check valves, and others. You will find them used in drawer slides, spray can agitation, tumbling media, locking mechanisms, and writing instruments.

Delrin is useful where rigidity, hardness, and high strength are needed. The balls are usually pure white in color, but can also be orange, yellow, brown, blue, gray, and black, depending on the manufacturing. Material properties, though, remain the same, irrespective of the color.

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Now that you know the role of a timing chain, let us discuss the two types of chains used by car producers. For each type of chain, there are different timing chain failure causes resulting from the specific build of the component.

Just as in the situation presented above, the engine will stop running. However, a broken timing chain will also cause extensive damage to the engine.