adjustable serpentine belt

  • However, the new variant also comes with less good properties. Namely less flexibility and less resistance during assembly. Most damages therefore occur during the installation of PTFE oil seals.

  • In the realm of automotive technology, the advent of spark plugs has revolutionized the internal combustion engine, enhancing its efficiency, performance, and overall reliability. These tiny devices, no larger than a thumbnail, play a crucial role in igniting the air-fuel mixture within the engine's combustion chamber, thereby initiating the power stroke that propels the vehicle forward.

  • Oil seals made of HNBR are characterised by excellent properties that include high resistance to mineral oils with additives, low steam and gas permeability, good cold flexibility down to -30 °C depending on type, good ozone resistance and friction resistance. HNBR seals withstand heat up to 150°C.

  • NBR & FKM
  • The spark plug is a critical component of any dirt bike's engine. It plays a key role in igniting the fuel-air mixture in the combustion chamber, which in turn powers the engine and drives the bike forward. Understanding the importance of the spark plug and how to maintain it properly is essential for every dirt bike rider. In this article, we will discuss everything you need to know about dirt bike spark plugs.
  • When it comes to selecting a valve cover gasket, choosing a top-quality product is important to ensure a long-lasting and effective seal. One of the top contenders in the market is the Top Valve Cover Gasket, known for its durability, reliability, and superior performance.
  • The Art of Replacing an LR4 Valve Cover Gasket
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  • There is a British Standard laid down for the control of synthetic rubbers. BS 3574 (1989) helps to determine shelf life – for instance, Nitrile (NBR) and Polyacrylic (ACM) are Group ‘B’ rubbers and have a 7-year life, whilst Silicone (VMQ) and Fluoroelastomers (Viton®) are Group ‘C’ rubbers and have a 10-year shelf life. PTFE and Leather do not come into this category but like the others should be kept in the original packing for as long as possible away from direct light, dust, and humidity. Ozone, which can also be produced by battery-driven forklift trucks has a very bad effect on synthetic rubbers. Finally, protect the sealing lip – DO NOT hang the seals on nails, wire etc.

  • a. Nitrile Rubber (NBR) – this is the most commonly used material. It has good heat resistance properties and has good resistance to salt solutions, oils, hydraulic oils, and gasoline. Operating temperatures are recommended from -40 to 248⁰ F (-40 to 120 deg.C). Nitrile also functions well in a dry environment, but only for intermittent periods. The disadvantage of this material is poor chemical resistance.

  • Extrusion and Nibbling

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  • Some disadvantages of NBR are poor ozone, sunlight and weather resistance as well as limited high temperature and flame resistance. For higher temperature resistance, a much better material to use is Silicone. 

  • Leather 
    Recommended for abrasive applications 
    Good running properties, due to the impregnated seal lip 
    Can be used on shafts which have a surface roughness outside the range for rubber seals 
    Not suitable for water

  • The metal case is the exterior (or frame) of the oil seal, the principal function of which is to give rigidity and strength to the seal. The material of the case must be selected depending on the environment where the seals are to be used. Often the metal case is covered by the same rubber material used in the sealing element, which also helps seal the exterior of the oil seal in the housing bore. Common case material types are:

  • In addition to their sealing capabilities, radial oil seals also provide additional benefits. For example, they can help to reduce noise and vibration in the machine by absorbing shock loads and minimizing the amount of movement between the shaft and the housing. They can also help to extend the life of the machine by preventing the ingress of contaminants and debris that can cause wear and damage to other components.

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  • Protection from damage: High mileage vehicles tend to suffer from more general wear and tear than younger cars. The additives in high mileage oil preserve and protect your entire engine.

  • Oil seals work by squeezing and retaining lubricant in a thin layer between the lip and the shaft. Perfect sealing is ensured by the hydrodynamic action of the rotating shaft, which in turn produces a slight pump action.

  • Types of Metal-to-Oil Seals

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  • 4. Heating, Ventilation, and Air Conditioning (HVAC) Systems Silicone gaskets are used in HVAC systems to seal ducts and prevent air leaks.
  • Excellent heat resistance and oil 
  • A typical spark plug consists of a ceramic insulator, a central electrode, and a ground electrode. When an electric current is passed through the plug, it creates a high voltage arc between the central and ground electrodes. This arc ionizes the air-fuel mixture, creating a plasma that rapidly expands and pushes the piston down the cylinder, generating mechanical energy.
  • The main lip is the most critical component of the seal.
    Its sealing edge comes in full contact with the shaft surface in order to provide excellent sealing performance.
    (See Figure 3.)