ムサシニュース
Cam shaft oil seals are mainly used to prevent leaks of engine oil inside the cylinder head of engines with timing belt type and to prevent foreign substances from penetrating from the outside.
Since the temperature in the engine becomes extremely high, heat resistant materials are used for cam shaft oil seals and oil seals with its outer rubber- covered are used mainly.
In engines equipped with a timing chain system, there is no cam shaft oil seal because oil also circulates in the chain mechanism on the outside of the camshaft.