That space is called "valve lash". It is a predefined gap set on a cold engine when the rocker arm is on the base circle of the cam.
Valve clearance.
It is the gap between the rocker arm and the push rod or valve in the head of the engine. How much it is varies with each model of engine.
It is between the valve top and rocker For 4ba1 it is 0.40mm
It is the gap between the rocker arm and the push rod or valve in the head of the engine. How much it is varies with each model of engine.
That is the hydraulic lifter
The function of a rocker arm is to control a valve in an engine. The rocker arm is a lever that rocks.
The function of a rocker arm is to control a valve in an engine. The rocker arm is a lever that rocks.
It will cause the engine to run rough and eventually it will damage the valve and rocker.
Do you mean valve "lash?" (The slack between the closed valve and the cam base circle.) That is adjusted the same way as on any other engine. Remove the valve cover and locate the adjustment screws on the rocker arms. Turn the crankshaft to position the rocker on the base circle and check the gap with a feeler gauge. Repeat for each valve.
A loose rocker arm for a valve mite be a easy fix with a valve adjustment
remove valve from rocker cover remove valve from end of hose reinstall new valve on hose reinstall new valve into rocker cover Reinstall with the RATTLE end towards the engine and the tube end topside.
The valve lash is not adjustable on that engine. The rocker arms are bolted down and torqued to specs. If you have valve clatter you have worn valve train parts.