Is the Crankcase Sealed?

[LondonAnn]

The crankcase is sealed. Front and rear crankshaft seals: The front and rear crankshaft seals in an engine are designed to maintain the internal working pressure and prevent leakage of lubricating oil. Sealing is achieved by installing oil seals on the bearing outer sleeves at both ends of the crankshaft, with sealant applied for additional protection. Impact on crankshaft rotation: To prevent oil leakage and external dust ingress, steel-cored rubber annular sealing rings are typically used. The outer ring features a steel core that's press-fitted into the cylinder block's seal ring seat, remaining stationary. The inner ring is elastic and contains a fine spring within the seal, utilizing its elasticity to press against the crankshaft journal, separating internal and external spaces while allowing unimpeded crankshaft rotation.