The valve stem oil seal precisely controls oil flow between the valve stem and valve guide. It ensures sufficient lubrication for the valve train while preventing engine oil from entering and burning inside the cylinder. Its working condition directly affects engine oil consumption, exhaust emissions, power stability and overall engine service life, making it an indispensable core sealing part for internal combustion engine maintenance.

In the chassis travel system of automobiles, trucks, buses and construction machinery, the wheel hub serves as a core component that bears vehicle weight and ensures normal wheel rotation. The wheel hub oil seal is a compact yet precise sealing part inside the hub assembly. Though easily overlooked in daily chassis maintenance, the tiny wheel hub oil seal plays an irreplaceable role in vehicle safety.

Small and simple in appearance, the crankshaft oil seal is an indispensable precision sealing core of engine power systems. It undertakes multiple tasks of oil retention, dust prevention and pressure stabilization to maintain a stable and clean engine lubrication system. Most engine oil leakage faults and early wear problems are closely related to crankshaft oil seal failure. Regular inspection, routine maintenance and standardized replacement of crankshaft oil seals are low-cost and high-return maintenance measures to lower engine failure rates, extend equipment service life and ensure efficient and stable operation of power systems.

Oil seals are categorized by application and structure into eight main series:Engine seals、Transmission seals、Heavy machinery hub seals、General skeleton oil seals:、Hydraulic pump seals、Mini small-device seals、Integrated mounting seals、Special customized seals

XTSEAO’s 6.6×12×7.5/12 valve stem seal offers a long-lasting sealing solution for engine valve trains through precise dimensions, reliable materials, and mature structural design. It is an essential component for ensuring stable engine operation and extending service life.

Oil seals are essential rotary shaft sealing components widely used in automobiles, engineering machinery, and hydraulic systems. Composed of a rubber lip, metal frame, and garter spring, they serve to prevent internal oil leakage and block external dust, water, and impurities. This article systematically introduces the definition, structural composition, common materials including NBR, FKM, VMQ and PU, as well as mainstream classifications of oil seals. It also analyzes the main causes of oil seal failure, summarizes key principles for model selection, and puts forward standard installation and daily maintenance guidelines. Proper material matching, accurate dimension selection, standardized mounting and reasonable application conditions are critical to extending the service life of oil seals, reducing equipment failure and ensuring stable mechanical operation.

This seal is installed at the spark plug tube opening on the valve cover to prevent oil from seeping into the spark plug bore.

Our 55×70×12mm Axle Shaft Oil Seal is a critical component for automotive drivetrain systems, engineered to prevent gear oil leakage from the differential or wheel hub while blocking contaminants like dust, water, and dirt.