•  To reduce sliding resistance, rocker arms with a needle roller bearing have been adopted. The needle roller bearing contacts and rolls thus it has less sliding resistance compared to the conventional cam and rocker arm which contacts and slides.

•  HLA has been adopted to prevent hammering noise and to realize maintenance-free valve clearance, maintaining constant "zero" valve clearance.

•  When installing the HLA, fill it with oil and lightly press the internal check ball using a round bar (1.0 mm diameter) to bleed air.

•  If clatter is heard when the engine is started right after replacing the oil, air infiltration in the HLA can be considered. Perform the following air bleeding steps (1) and (2), and if the noise still occurs, inspect the HLA.

•  Not applicable