Final answer:
Tech A says hydraulic valve lifter bottoms should be flat or concave. Tech B says a sticking lifter plunger may cause a burned exhaust valve. Both Tech A and Tech B are correct.
Step-by-step explanation:
Both Tech A and Tech B are correct in this scenario.
- Tech A: Hydraulic valve lifter bottoms should be flat or concave.
- Tech B: A sticking lifter plunger may cause a burned exhaust valve.
When the lifter plunger sticks, it fails to allow proper oil flow, which can lead to improper valve clearance and result in a burned exhaust valve.