Doosan A2300 - Page 217

A Series Diesel Engine Base Engine Components 215
Seat Angle
Intake: 30 Degrees
Exhaust: 45 Degrees
Measure rim thickness.
Minimum Thickness (T)
Standard: 1.2 mm [0.047 in]
Worn Limit: 0.5 mm [0.0197 in]
Check the valve stem tip for flatness.
If required, re-surface the valve stem tip.