Does the Volkswagen Polo cylinder head screw have a washer?

[DiKennedy]

Volkswagen Polo cylinder head screws have washers. The washers can be divided into three types. Industrial rubber sheet: Natural rubber is suitable for media such as water, seawater, air, inert gases, alkalis, salt solutions, etc., but it is not resistant to mineral oils and non-polar solvents. The long-term use temperature should not exceed 90°C, and it has excellent low-temperature performance, usable above -60°C. Nitrile rubber is suitable for petroleum products such as petroleum, lubricating oil, fuel oil, etc. The long-term use temperature is 120°C, and it can withstand 150°C in hot oil. The low-temperature range is -10~-20°C. Chloroprene rubber is suitable for seawater, weak acids, weak alkalis, and salt solutions. It has excellent resistance to oxygen and ozone aging, and its oil resistance is second only to nitrile rubber but better than other general rubbers. The long-term use temperature is below 90°C, with a maximum use temperature not exceeding 130°C, and a low-temperature range of -30~-50°C. Asbestos rubber sheet: Although rubber and some fillers are added to the gasket material, it still cannot completely fill those interconnected micro-pores, resulting in slight permeability. Therefore, it cannot be used in highly polluting media, even under low pressure and temperature. When used in some high-temperature oil media, due to the carbonization of rubber and fillers in the later stages of use, the strength decreases, and the material becomes loose, leading to permeation at the interface and inside the gasket, causing coking and smoking phenomena. Polytetrafluoroethylene: Polytetrafluoroethylene is prone to cold flow and creep under pressure and high temperature, so it is generally used for low-pressure, medium-temperature, highly corrosive, and pollution-free media, such as strong acids, strong alkalis, halogens, pharmaceuticals, etc.