Inspecting the valves
- Measure the diameter of the valve stems in the three positions indicated in the diagram.
STANDARD DIAMETER
Specification Desc./Quantity
Inlet: 4.987 - 4.972 mm
Outlet: 4.975 - 4.960 mm
MINIMUM ADMISSIBLE DIAMETER
Specification Desc./Quantity
Inlet: 4.96 mm
Outlet: 4.945 mm
- Calculate the clearance between valve and valve guide.
- Check the deviation of the valve stem by resting
it on a "V" shaped abutment and measuring the
extent of the deformation with a comparator.
Characteristic
Limit values admitted:
0.1 mm
- Check the concentricity of the valve head by ar-
ranging a comparator at right angle relative to the
valve head and rotate it on a "V" shaped abutment.
Characteristic
Admissible limit:
0.03 mm
Engine Nexus 500 euro 3
ENG - 148
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