Answer :
Final answer:
Rocker arms in an OHV engine with hydraulic lifters are automatically adjusted by the engine oil pressure that maintains zero valve lash, ensuring consistent valve timing and reduced engine noise and wear.
Explanation:
The rocker arms in an OHV engine with hydraulic lifters are adjusted automatically through hydraulic pressure. Unlike solid lifters that require manual adjustment, hydraulic lifters use the engine oil pressure to maintain zero valve lash. This self-adjustment ensures that the valve timing stays consistent and helps in mitigating the engine noise and wear which is common with solid lifters. As the engine runs, the lifters are continuously adjusting to maintain the correct valve clearance. Hence, for an OHV engine with hydraulic lifters, the correct mode of adjustment is option B) Automatic adjustment through hydraulic pressure.
