What type of valve lifter automatically compensates for the effects of engine temperature?
d. all of the above
Valve lifter is the part which transfers the movement of the cam to valve through pushrod and rocker arm. Valve lifter is of mechanical and hydraulic type.
The heat produced by the engine may expand the parts in the valve train because of which a clicking sound produces and results in wear of valve train components. To compensate the expansion of the parts due to heat small clearance is maintained in mechanical type of cam lifter.
In hydraulic type of lifter, the gap is not required as hydraulic valve lifter automatically compensates the effect of temperature by maintaining a direct connection between valve train components.
Therefore, correct option is [a]