- When it comes to spark plugs, the a7tc spark plug stands out as a popular choice among motorbike enthusiasts. Designed for use in small engines like those found in motorcycles, ATVs, and scooters, the a7tc spark plug offers reliable performance and long-lasting durability.
Operating conditions such as the engine’s temperature, position, size, pressure and shaft speed largely determine which individual oil seal composition is most suitable for every individual application.
- However, like all spark plugs, the A7TJC requires regular inspection and timely replacement. Worn or dirty spark plugs can lead to misfires, decreased performance, and increased fuel consumption. Following the manufacturer's recommended service intervals is crucial to maintain the peak performance of the engine.
The metal case serves as the oil seal’s exterior or frame, providing rigidity and strength to the seal. The case material selection depends on the environment in which the seal will operate. Often, the same rubber material used in the seal element covers the case to help seal the exterior of the oil seal in the housing bore.
Look at the end of the sump. If you cannot see clearly whether you need to remove the engine, consult a car service manual or dealer.
As shown in Figure 1, sealing devices come in two types: contact and non-contact.
Oil seals are among the major contact type sealing devices.
They are typically made from elastomers such as rubber or silicone and consist of an outer metal case with a sealing lip on the inner side.
Recognizing and avoiding common installation mistakes is key to the longevity and effectiveness of oil seals. Here are some frequent errors to watch for:
Table 2: How to select the seal type
EPDM oil seals are less common. They are used in solvent, hot water and steam applications, EPDM resists low temperatures down to -50 °C and UV radiation well. Some types of EPDM are also suitable for higher temperatures up to +150 °C. EPDM oil seals are usually available upon request.
Use an old screwdriver or scraper to carefully remove all traces of the old gasket from the cover and engine flanges.
VMQ, also known as silicone, is also used for oil seals, but this is less common because the mechanical strength of VMQ is low and this material has poor wear-resistance This makes it less suitable for dynamic applications, but it can withstand fairly low and high temperatures from -60 °C to 200 °C. Many types of VMQ are also suitable for contact with pharmaceutical and food products, so VMQ is an option worth considering. VMQ oil seals are usually available on request.
VMQ (silicone)
Summary
Heat resistance
HALOGEN
Apply gasket sealant to the engine flange and refit the cover. Tighten the fixings but do not overtighten them.