Product Description
Product Name.: | tensioner |
Part No.: | 3945527 |
Quality.: | proper mass |
Trademark.: | DFYAHAN or Customized |
Delivery Time.: | Quick delivery |
MOQ.: | 1 PCS |
Service.: | Best aftersale service |
Weight. : | 2Kg |
1, International Express.Such as DHL, UPS, EMS, ARAMEX and so on.Usually after 5 to 7 days
you can get the packages.
2, Air Transportatio:.For goods above 100kg, it is a economical choice for the customers.
3, International Marine Container.
1, We will send the goods as fast as we can to save your time..
2, All the pictures on our website are real images of the part itself, what you see is what you get.
3, Goods will Be packed safe & carefully
1. Genuine parts or OEM partsor aftermarket parts are both available.
2.Products are in best quanlity and best price.
3. Warranty is SIX months.
4. For mass order, package can be customized.
ShiYan YAZHAN Exhibition is located in HangZhou, ZheJiang , the capital of trucks in China (the birthplace of Xihu (West Lake) Dis.feng Motors). The company adheres to the principle of never giving up once cooperation, CZPT operation, and customer first to provide the best service to new and old customers.
The company’s product range includes Cumminss B, C, L, LK series mechanical diesel engines, ISB, ISDe, QSB, ISLe, ISL, QSL, ISZ, QSZ and other electronic controlled diesel engines, as well as B, C, L series natural gas engines. The engine displacement includes 2.8L, 3.8L, 3.9L, 4.5L, 5.9L, 6.7L, 8.3L, 8.9L, 9.5L, and 13L, with a power coverage range of 80-680 horsepower;
Including: 1. Cumminss engine assembly
2. Xihu (West Lake) Dis.feng Cumminss engine accessories (B3.3/4B3.9/6B5.9/6C8.3/6L8.9/ISBe/ISCe/ISDe/ISLe)
3. ZheJiang Cumminss Engine Accessories (Nt855/Kta19/Kta38/Kta50/QSK23/QST30)
4. HangZhou Cumminss Engine Accessories (ISM/QSM)
5. CZPT Cumminss engine accessories (ISF2.8/ISF3.8/ISG)
6. Frega filter
7. Boschs fuel injectors, fuel pumps, and other series
8. Engine aftertreatment urea pump series
Question 1:How to buy engine spare parts? First of all, please tell us the part number of the parts you need. We will supply the same parts as yours. Secondly, if you don’t know the part number, please provide parts name and engine series number, then we will check the part number through engine series number.
Question 2:How long is the delivery time? For complete engine and Power units , we need to arrange production according to the order, our general delivery time is 15-30 days. For spare parts , our general delivery time is 3-10 days.
Question 3:How to arrange delivery? Considering the large volume and weight of our products, to save the shipping cost, we generally recommend ship to your nearest port For small items and urgent orders, we can also provide air shipment and send goods to the airport in your city or your company address.
Question 4:How about Payment Methods? We suggest 30/70,T/T payment method: 30 percent down payment on placement of the order, with the remaining 70% due upon shipment. Question 5:How about Packing Methods? Normally we use wooden boxes for packaging or we can pack it according to your special needs.
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What is the role of belt tensioner materials and coatings in performance and longevity?
Belt tensioner materials and coatings play a crucial role in the performance and longevity of belt tensioners. The choice of materials and coatings directly impacts the tensioner’s ability to withstand the forces and loads encountered in belt-driven systems, resist wear and corrosion, and maintain consistent performance over time. Here’s a detailed explanation of the role of belt tensioner materials and coatings in performance and longevity:
- Strength and Durability:
- Wear Resistance:
- Corrosion Resistance:
- Friction Reduction:
- Temperature Stability:
- Lubrication Enhancement:
- Noise and Vibration Damping:
The materials used in belt tensioners need to possess high strength and durability to withstand the mechanical stresses and loads imposed on them. Tensioner components are subjected to continuous movement and contact with the belt, which can lead to wear, fatigue, and potential failure. High-strength materials, such as hardened steels or alloys, are commonly used to ensure the tensioner’s structural integrity and longevity.
Belt tensioners are exposed to friction and wear as they come into contact with the belt during operation. Materials with excellent wear resistance properties, such as hardened surfaces or wear-resistant coatings, are employed to minimize the wear rate and extend the tensioner’s lifespan. These materials and coatings help maintain optimal contact between the tensioner and the belt, reducing the risk of belt slippage and premature failure.
In certain environments, belt tensioners may be exposed to corrosive substances, moisture, or contaminants, which can lead to corrosion and degradation of the tensioner components. Corrosion-resistant materials, such as stainless steel or corrosion-resistant alloys, are often utilized to protect the tensioner against corrosive elements. Additionally, coatings like zinc plating or other protective finishes can be applied to enhance the tensioner’s corrosion resistance.
Reducing friction between the tensioner and the belt is essential for minimizing wear and maintaining consistent tension. Materials or coatings with low friction coefficients can help reduce the frictional forces and energy losses associated with the tensioner’s operation. By reducing friction, these materials and coatings contribute to improved efficiency, reduced heat generation, and increased longevity of the tensioner and the entire belt-driven system.
Belt tensioners are exposed to a wide range of operating temperatures, including both high and low extremes. Materials with good temperature stability and resistance to thermal degradation are essential for reliable tensioner performance. Heat-resistant alloys, high-temperature plastics, or thermal barrier coatings may be utilized to ensure that the tensioner maintains its mechanical properties and functionality under elevated temperatures.
Some tensioner materials or coatings are designed to enhance lubrication and reduce friction between moving parts. They may have self-lubricating properties or be compatible with specific lubricants used in the belt-driven system. These materials and coatings help reduce wear, heat generation, and the need for external lubrication, contributing to improved performance and extended longevity of the tensioner.
Belt tensioners can generate noise and vibration during operation, which can affect the comfort and performance of the belt-driven system. Certain materials or coatings can help dampen vibrations and reduce noise levels, improving the overall system’s performance and minimizing potential issues associated with excessive noise or vibrations.
In summary, the choice of belt tensioner materials and coatings is critical for ensuring optimal performance and longevity. Materials with high strength and durability, wear resistance, corrosion resistance, friction reduction, temperature stability, lubrication enhancement, and noise/vibration damping properties contribute to the tensioner’s ability to withstand the operational demands of belt-driven systems. By selecting appropriate materials and coatings, manufacturers can enhance the reliability, durability, and overall efficiency of belt tensioners, leading to extended service life and improved performance of the belt-driven systems they are used in.
How do innovations and advancements in belt tensioner technology impact their use?
Innovations and advancements in belt tensioner technology have a significant impact on their use, enhancing performance, reliability, and versatility. These advancements introduce new features, improve functionality, and address specific challenges associated with belt-driven systems. Here’s a detailed explanation of how innovations and advancements in belt tensioner technology impact their use:
- Improved Tensioning Mechanisms:
- Enhanced Durability:
- Increased Compatibility:
- Noise and Vibration Reduction:
- Advanced Monitoring and Diagnostic Capabilities:
- Integration with System Controls:
New tensioning mechanisms and designs have been developed to provide more precise and efficient tension control. Innovations such as automatic tensioners or self-adjusting tensioners utilize advanced mechanisms that can continuously monitor and adjust the tension in real-time. This improves the overall performance and reliability of belt-driven systems, as the tension can be accurately maintained even under varying loads and operating conditions.
Advancements in materials and manufacturing techniques have contributed to the development of more durable belt tensioners. High-strength alloys, advanced polymers, and specialized coatings are used to increase the resistance to wear, corrosion, and fatigue. These improvements extend the service life of belt tensioners, reducing the frequency of maintenance and replacement and improving the overall reliability of belt-driven systems.
Innovations in belt tensioner technology have led to increased compatibility with a wide range of belt drive systems. Manufacturers have developed adjustable tensioners that can accommodate different belt widths, profiles, and types. This versatility allows for easier integration and replacement of tensioners in various industrial or automotive applications, reducing the need for custom solutions and simplifying maintenance and repairs.
New technologies and designs have been introduced to minimize noise and vibration generated by belt tensioners. Innovative damping materials, improved bearing systems, and optimized geometries help reduce noise and vibration levels, resulting in quieter and smoother operation. This is particularly beneficial in applications where noise reduction and operator comfort are essential.
Advancements in belt tensioner technology have facilitated the integration of monitoring and diagnostic capabilities. Smart tensioners equipped with sensors and connectivity features can provide real-time data on tension levels, temperature, and other operating parameters. This enables predictive maintenance, early fault detection, and optimized performance. By leveraging data-driven insights, operators can make informed decisions, improve system efficiency, and prevent unexpected failures.
Innovative belt tensioner technologies can be integrated with system controls and automation platforms. This allows for seamless integration into larger control systems, enabling automated tension adjustments, synchronization with other components, and coordinated operation. The integration of belt tensioners with system controls enhances system performance, efficiency, and overall productivity.
In summary, innovations and advancements in belt tensioner technology have a significant impact on their use. These advancements improve tensioning mechanisms, enhance durability, increase compatibility, reduce noise and vibration, enable advanced monitoring and diagnostics, and facilitate integration with system controls. By incorporating these innovations, belt tensioners offer improved performance, reliability, and versatility, leading to enhanced efficiency and reduced maintenance requirements in various industrial and automotive applications.
What industries and machinery commonly use belt tensioners for optimal belt performance?
Various industries and machinery rely on belt tensioners to achieve optimal belt performance. Here’s a detailed explanation of the industries and machinery that commonly use belt tensioners:
- Automotive Industry:
- Industrial Machinery:
- Power Generation:
- Agricultural Equipment:
- Construction and Mining:
- HVAC and Refrigeration:
The automotive industry extensively utilizes belt tensioners in vehicles for various applications. Belt tensioners are commonly found in the engine accessory drive system, where they maintain the proper tension in the serpentine or V-belts that power components such as the alternator, air conditioning compressor, power steering pump, and water pump. Belt tensioners ensure efficient power transmission, reduce belt slippage, and contribute to the overall reliability and performance of automotive engines.
A wide range of industrial machinery relies on belt tensioners for optimal belt performance. Industries such as manufacturing, food processing, packaging, printing, and material handling use belt-driven systems for conveyor belts, production lines, pumps, compressors, and other equipment. Belt tensioners help maintain the proper tension in these applications, ensuring smooth operation, efficient power transmission, and minimizing downtime due to belt slippage or failure.
In the power generation sector, belt tensioners are commonly used in applications such as generators, turbines, and auxiliary equipment. These systems often utilize belts to transfer power between components, and the tensioners play a crucial role in maintaining proper belt tension. Belt tensioners help optimize power transmission efficiency, reduce vibrations, and enhance the overall reliability of the power generation equipment.
Agricultural machinery, including tractors, combines, and other farming equipment, often rely on belt-driven systems for various operations. Belt tensioners are utilized to maintain the tension in belts powering agricultural implements, such as harvesters, balers, and grain conveyors. By ensuring optimal tension, belt tensioners contribute to the efficient operation of agricultural equipment, improving productivity and reducing maintenance requirements.
Construction and mining industries commonly employ belt-driven systems in equipment such as excavators, loaders, crushers, and conveyor systems. Belt tensioners are used to maintain the proper tension in belts powering these machines, ensuring reliable and efficient operation in demanding environments. Belt tensioners help prevent belt slippage, reduce downtime, and contribute to the longevity of the equipment.
The HVAC (Heating, Ventilation, and Air Conditioning) and refrigeration industries rely on belt-driven systems for various applications, including fans, blowers, compressors, and pumps. Belt tensioners are critical in maintaining the proper tension in these systems, ensuring efficient power transmission and reducing belt-related issues such as slippage or premature wear. Belt tensioners contribute to the overall performance and reliability of HVAC and refrigeration equipment.
In addition to the industries mentioned above, belt tensioners are also utilized in a wide range of other machinery and equipment, including woodworking machinery, textile machinery, marine propulsion systems, and more. The versatility and benefits of belt tensioners make them a valuable component for achieving optimal belt performance in numerous industrial and mechanical applications.
editor by lmc 2024-11-12
China Standard Cheap Price Tensioning Wheel Bearing Pulley Unit 13505-67041 13505-67040 Vkm 71014 62 Tb0629b30 135050L010 531021520 for CZPT Innova Diesel 2005 wholesaler
Product Description
Quick view:
Name | Tensioning Wheel Bearing Pulley Unit 13505-67041 13505-67040 VKM 71014 62 TB0629B30 135050L571 531571520 | |||
Material | steel GCr15, 65Mn, or 55 | |||
Application car makes | Toyota Innova Diesel 2 | Kia | ||
B660-12-7 | Mazda | |||
RFC6-12-7 | Mazda | |||
F801-12-7 | Mazda | |||
FE1H-12-7 | Mazda | |||
WL01-12-7 | Mitsubishi | |||
MD315265 | VKM75 | Mitsubishi | ||
24410-26 | Mitsubishi | |||
MD169592 | VKM75 | Mitsubishi | ||
MD115976 | VKM75044 | CR5073 | F-554646 | Mitsubishi |
MD182537 | VKM75064 | CR5078 | Mitsubishi | |
MD030605 | VKM751 | Mitsubishi | ||
MD129355 | VKM75101 | CR5070 | Mitsubishi | |
23357-32040 | VKM75113 | CR5071 | F-124078 | Hyundai |
MD | Mitsubishi | |||
MD129033 | VKM75130 | CR5084 | Mitsubishi | |
24450-33571 | VKM75144 | CR5067 | Hyundai | |
23357-42571 | VKM75601 | CR5076 | F-124070 | Hyundai |
24317-42571 | VKM75612 | CR5077 | F-124052 | Hyundai |
24317-42571 | VKM75612 | CR5077 | F-124052 | Hyundai |
MD352473 | VKM75613 | CR5171 | Mitsubishi | |
MD329976 | VKM75615 | CR5172 | Mitsubishi | |
MD320174 | VKM75616 | CR5137 | Mitsubishi | |
24410-57150 | VKM75621 | CR5225 | Hyundai | |
MD356509 | VKM75625 | CR5206 | Mitsubishi | |
12810-71C02 | VKM76 | SUZUKI | ||
12810-81401- | SUZUKI | |||
12810-86501 | VKM76203 | CR5101 | SUZUKI | |
13505-87702- | S ubaru | |||
8-94472-349- 1 |
VKM79.1 | Daewoo | ||
13503-62030 | VKM81 | Toyota | ||
13503-54571 | VKM81 | Toyota | ||
13503-54030 | VKM81 | Toyota | ||
13503-10571 | VKM81201 | CR5026 | F-124073 | Toyota |
13503-1571 | VKM81203 | CR5571 | F-124089 | Toyota |
13503-11040 | VKM814 | Toyota | ||
13074-05E | Nissan | |||
13077-V7202 | VKM825 | Nissan | ||
FS01-12-730A | VKM84 | Mazda | ||
FE1H-12-730A | VKM846 | Mazda | ||
OK972-12-730 | VKM84601 | CR5055 | Kia | |
24810-33571 | VKM85 | I suzu | ||
9281571212 | CR3395 | F-22 | Fiat / Lancia | |
57119243L | VKM11107 | CR3467 | F-55571 | Audi / VW |
1112571119 | VKM23063S | CR1458 | F-220122 | Mercedes Benz |
CR3416 | PSA | |||
7784613 | CR1440P | F-123753 | Fiat / Lancia | |
CR1452P | Fiat / Lancia | |||
601257170 | CR1477 | F-220124 | Mercedes Benz | |
CR1478 | ||||
CR1480 | O pel / GM | |||
CR1480P | O pel / GM | |||
715713 | CR1481 | FORD | ||
CR1484 | Fiat / Lancia | |||
90324097 | CR1486 | F-225717 | O pel / GM | |
CR1497 | Fiat / Lancia | |||
CR1498 | Fiat / Lancia | |||
CR1499 | FORD | |||
7301662 | CR1647 | F-88019.2 | Fiat / Lancia | |
11281731220 | CR3571 | F-225569 | BMW | |
11281731838 | CR3571 | F-225633 | BMW | |
XS4Q6B217AD | CR3102 | F-143 | FORD | |
6682571419 | CR3118 | Mercedes Benz | ||
668257171 | CR3119 | Mercedes Benz | ||
9635638380 | CR3218 | F-123183.18 | R enault | |
46547564 | CR3270 | Fiat / Lancia | ||
5 | Fiat / Lancia | |||
96036288 | CR3276 | F-120676 | PSA | |
962 | PSA | |||
CR3296 | F-123788 | PSA |
Our Bearing Advantage:
1.Free Sample bearing
2.ISO certified
3.Bearing Small order accepted
4.In Stock bearing
5.OEM bearing service
6.Professional: Over 20 years manufacture bearing
7.Customized bearing, Customer’s bearing drawing or samples accepted
8.Competitive price
9.TT Payment, Paypal, Alibaba payment, Trade Assurance Order
FAQ:
Q: Can you help with my own brand?
A: Sure. We can make for your brands. We can mark your brand name and use your box’s design with the legal authority letter.
Q: How can I make an inquiry?
A: You can contact us by email, telephone, WhatsApp, , etc.
Q: How long can reply inquiry?
A: Within 24 hours.
Q: Which Service you can provide?
A: 1. Help customers to choose correct bearing
2. Professional team, make your purchase easily
Q: When are you going to deliver?
A: Sample: 5-15 business days after payment is confirmed.
Bulk order:15-60 workdays after deposit received…
Q: What’s your delivery way?
A: By sea, by air, by train, express as your need.
Q: What are your terms of delivery?
A: EXW, FOB, CFR, CIF, DAP, etc.
Q: Can you support the sample order?
A: Yes, we can supply the sample if we have parts in stock, but the customer has to pay the sample payment(according to the value of the samples) and the shipping cost.
Q: What are you going to do if there has a claim for the quality or quantity missing?
A: 1. For quality, during the warranty period, if any claim for it, we shall help customer to find out what’s the exactly problem. Using by mistake, installation problem, or poor quality? Once it’s due to the poor quality, we will arrange the new products to customers.
2. For missing quantities, there have 2 weeks for claiming the missing ones after receiving the goods. We shall help to find out where it is.
How to Prevent Timing Belt Problems
Unlike their predecessors, timing chains and timing belts are made of rubber and synchronize the opening and closing of valves in the engine. While their benefits are numerous, they are prone to wear and tear over time. Here are some tips for ensuring your timing belt lasts for many years. Listed below are some of the most common problems that you may encounter when changing your timing belt. Read on to find out how to prevent them and keep your car running at peak performance.
Timing belts are rubber
There are many advantages to using timing belts in your car. They are lightweight and reduce the strain on your vehicle’s internal components. They are also quiet when running, so you won’t have to listen to your car to know that maintenance is needed. If you’re concerned about noise, a quiet engine can help you determine whether your timing belts are broken or if you need to replace them altogether. A quiet engine can also help you notice signs of wear and tear before you do.
Regardless of material, rubber timing belts can be susceptible to stretching and breaking. They also are susceptible to high temperatures and the lubrication of motor oil, reducing their lifespan. Manufacturers have responded to this problem by creating timing belts made of engine-temperature-resistant rubber materials. The improved rubber compounds also provide greater strength and resistance to distortion. Reinforcing fibers also protect the teeth from shearing, reducing the risk of a worn-out timing belt.
While the open-ended, or spliced, types of timing belts have many advantages, they are generally unsuitable for high-speed applications. In most cases, rubber timing belts are used in high-speed machine tools and automatic doors. They are also quiet and require minimal maintenance. These characteristics make rubber timing belts a great choice for high-speed applications. You can even order custom-made timing belts for unusual applications.
Timing belts are important for the functioning of an engine. They link the camshaft and crankshaft to the crankshaft. They control the movement of valves and pistons. If a timing belt fails, it can cause major damage to the engine. If you are unsure of the benefits of rubber timing belts, consider a video on the topic. This will provide you with more information on timing belts.
They synchronize the opening and closing of the engine’s valves
During the combustion process of the engine, the valves in the cylinder head open and close. Fresh air enters the cylinder, which burns with the fuel to generate power. Exhaust escapes the engine through the exhaust valve. Each cylinder contains between 2 and 4 valves. The timing belt drives a camshaft, which rotates in a precise manner to synchronize the valve opening and closing.
A timing belt is a toothed rubber belt that connects the engine’s crankshaft to the crankshaft. Like most rubber parts, timing belts degrade over time, so it’s important to replace them at the proper intervals. Replacement intervals vary depending on the make and model of the vehicle, but they should be replaced every 60 to 90 thousand miles.
A broken timing belt will not start the engine. A timing belt driven vehicle will need to be towed to a repair shop for repairs. In the automotive industry, timing belts drive both “free running” and “interference” engines. The timing belt transfers the crankshaft’s rotation to the camshafts, which in turn actuate the valves in the intake and exhaust system. When they malfunction, the pistons can contact open valves, bending or punching them.
Timing belts also work with pistons and connecting rods to create power. Perfect timing is essential for the engine to run smoothly. The timing belt regulates both the pistons and the valves. If they are out of sync, they may not ignite properly, leading to catastrophic engine failure. When you’re looking for a replacement, look for these signs of wear.
They are lighter, quieter and more efficient than timing chains
While the initial choice was for quieter performance, variable timing has led to greater efficiency and power. While noise is a factor, the average consumer cannot tell the difference. And while timing belts are generally lighter and quieter, a chain can be more noisy than a belt, which can cause more engine damage. If you’re unsure whether you should opt for a chain or a belt, consult your owner’s manual.
A timing chain functions similar to a timing belt but is made from metal and is housed inside the engine compartment. It receives its lubrication from engine oil. Timing chains can last a long time as long as you keep them properly maintained. A timing chain is not as efficient as a timing belt, but it is more accurate, quieter and easier to maintain.
A timing belt uses teeth to time the movement of various components in an engine. When the timing belt is broken, the valves in the engine will not be in sync, leading to a loss of pressure in the combustion chamber. This can cause a plethora of engine problems and cost-increasing repairs. A timing belt is also quieter and requires less lubrication, so it is safer and quieter than a timing chain.
After the advent of variable valve timing, cars began to use a timing chain. This design improved engine performance and reduced maintenance, but it also caused a backlash as consumers were no longer interested in this kind of routine maintenance. Today, however, timing chains are making a comeback in the automotive industry. While modern chains can still be noisy, they are easier to maintain, are lighter, and last longer than their chain counterparts.
They wear out over time
Even the best drive belts will eventually wear out. The main causes of belt wear include mileage and heat. The belt bends as it passes the pulley, producing heat that hardens the rubber. When the belt slips, it increases friction, accelerating the process. A worn-out belt can be very difficult to start, causing an engine to lose fuel efficiency. To help prevent this problem, check the belt for wear and tear.
A timing belt is an engine component that connects the camshaft to the crankshaft and controls the timing of combustion. These belts are made of industrial-strength rubber, and often contain nylon-reinforced cords. Although they are meant to last, they will eventually wear out. If the timing belt fails, your engine won’t run smoothly or you could spend thousands of dollars fixing it.
A faulty timing belt can cause the valves to open too early or too late, causing poor combustion and a drop in engine performance. If the timing belt breaks, the valves may hit the pistons and cause damage. This can lead to engine breakage, which requires a new engine. To prevent this, you should replace the timing belt every couple of thousand miles. If you can’t find a reliable mechanic, it is best to seek professional help from a reputable mechanic.
Another warning sign that your timing belt needs replacing is a ticking sound coming from within your engine. This is an indication of a lower oil pressure than normal. Low oil pressure can affect the timing belt as it can cause the tensioner that holds the belt taut will lose pressure. Eventually, the belt may even break, allowing the camshafts to slip and break. Once this happens, it is time to replace the timing belt.
They can be repaired
Timing belts can be repaired. If your timing belt breaks, you can take your car to a repair shop to have it repaired or replaced. The price of a repair depends on the labor hours and how many hours it takes to do the job. A bad timing belt can ruin your engine and cause it to break down completely. If you’re unable to drive your vehicle, it may require towing and a new engine.
For most drivers, a timing belt replacement will cost about $1,000 at a dealership. Luckily, you can often get the same service for less at an independent auto repair shop. Often, a timing belt repair requires replacing the water pump, too. It makes sense to replace both at the same time. But remember that timing belts are more complicated than that. If you’re worried about the cost, you can replace the water pump along with the timing belt.
If you’re in the mood to do this repair, there are many companies that offer this service. The cost is relatively low and you’ll probably save hundreds of dollars over the course of the job. However, timing belt repair is not a simple job and must be done correctly or you could end up damaging your car engine. Therefore, it’s important to know how to repair a timing belt yourself to avoid the high price of hiring a mechanic.
When timing belts start to fail, there are a few warning signs you can listen for. A difficult start-up can be a sign that your belt needs to be replaced. Also, thick smoke coming from the tailpipe can be a sign that the timing belt needs to be changed. In addition to these symptoms, your timing belt may have a crack or broken gear teeth, which means it needs to be replaced.