Subsequent valve mechanism inspections will be made at which interval after the initial 25-hour inspection?

Subsequent valve mechanism inspections will be made at which interval after the initial 25-hour inspection?

• A. 25 hours
• B. 50 hours
• C. 100 hours
• D. 150 hours

Answer: (C)

The interval being tested is about how often valve clearances are checked after the initial setup. After the early 25-hour inspection, the standard maintenance practice is to recheck the valve mechanism every 100 hours. The reason is that during break-in, wear can change more quickly and needs close monitoring, while once the engine has settled, wear typically progresses more slowly, allowing a longer, regular interval. Valve clearances can drift with use, heat, and seating, so sticking to a 100-hour schedule helps catch any out-of-tolerance conditions before they affect performance or reliability. If a valve is found out of tolerance, it’s addressed then and the schedule may be adjusted based on the result.

The interval being tested is about how often valve clearances are checked after the initial setup. After the early 25-hour inspection, the standard maintenance practice is to recheck the valve mechanism every 100 hours. The reason is that during break-in, wear can change more quickly and needs close monitoring, while once the engine has settled, wear typically progresses more slowly, allowing a longer, regular interval. Valve clearances can drift with use, heat, and seating, so sticking to a 100-hour schedule helps catch any out-of-tolerance conditions before they affect performance or reliability. If a valve is found out of tolerance, it’s addressed then and the schedule may be adjusted based on the result.