Camshaft seal is used (1) to seal the camshaft ends from engine components (2).
Seals are required to prevent (3) oil leakage and prevent dust (4) and other contaminants (5) from entering the engine. It is a round shaped rubber element (6) that is fixed in between the camshaft end and the camshaft retainer. Engine oil, which lubricates the internal moving parts, flows over the camshaft. Without the camshaft seal, the oil would leak out of the engine (7). Camshaft seals do not normally need to be replaced (8) unless other oil leakage (9), such as the camshaft, are being replaced.
Ответ: is used, components, to prevent, dust, contaminants, rubber element, engine, to be replaced, oil leakage