Final answer:
In adjusting valve lash on an engine with hydraulic lifters, it's least likely for a tech to turn the adjusting nut clockwise 2 turns at a time, as it can cause engine damage.
Step-by-step explanation:
The question pertains to the procedure of adjusting valve lash on an engine with hydraulic lifters, particularly during operation. When adjusting valve lash on such an engine, technicians typically turn the adjusting nut in small increments, such as a quarter turn at a time, to fine-tune the valve clearance. The step that is LEAST LIKELY to be taken by a technician is "turning the adjusting nut clockwise 2 turns at a time".
This is because making such large adjustments can lead to excessive valve clearance or overly tight valves, potentially causing engine damage. A more common step might be turning the adjusting nut clockwise in smaller increments, or adjusting counterclockwise until a slight lash is perceptible (often heard as a “click”). The installation of oil shrouds on the rocker arm is not a standard procedure during the valve lash adjustment process.