Valve And Valve Guide - Jianshe JS125-6B Maintenance Manual

Valve and valve guide

1. Measure
Gap between valve stem and guide
Gap between valve stem and guide =guide inside
diameter-valve stem diameter
Out of specification
Gap between valve stem and guide:
Intake: 0.01 0.037 mm limit value:0.08mm
Exhaust: 0.025 0.052 mm limit value:0.10mm
Note
After replacing the valve guide, repair the valve seat
face once more.
2. Clean
Carbon deposit
(Eliminate from valve face)
3. Check
Valve face
Pit corrosion or wear
Valve stem end
Mushroom shape or the diameter is more than the
other parts of the valve stem
4. Measurement
Swing tolerance (valve stem)
Out of specification
69
ENGINE
Replace valve guide
Polish surface
Replace
Swing tolerance:
less than 0.01 mm
Replace