Valve, Valve Guide Inspection

VALVE, VALVE GUIDE INSPECTION





1. Measure the valve head margin thickness of each valve.
^ If it is less than the specification, replace the valve.
Valve head margin thickness (Minimum)
IN: 1.62 mm (0.0637 in)
EX: 1.82 mm (0.0716 in)





2. Measure the length of each valve. Replace the valve if necessary.
^ If it is less than the specification, replace the valve.
Valve length (Standard)
IN: 102.99-103.79 mm (4.055-4.086 In)
EX: 104.25-105.05 mm (4.105-4.135 In)
Valve length (Minimum)
IN: 102.99 mm (4.055 in)
EX: 104.25 mm (4.104 in)





3. Measure the stem diameter of each valve in X and Y directions at the three points (A, B, and C) as indicated in the figure. If it exceeds the specification, replace the valve.
Valve stem diameter (Standard)
IN: 5.470-5.485 mm (0.2154-0.2159 In)
EX: 5.465-5.480 mm (0.2152-0.2157 In)
Valve stem diameter (Minimum)
IN: 5.440 mm (0.2142 in)
EX: 5.435 mm (0.2140 in)





4. Measure the inner diameter of each valve guide in X and Y directions at the three points (A, B, and C) as indicated in the figure.
^ If not as specified, replace the valve guide.
Valve guide Inner diameter (Standard) 5.509-5.539 mm (0.2169-0.2180 In)





5. Calculate the valve stem to guide clearance by subtracting the outer diameter of the valve stem from the inner diameter of the corresponding valve guide. If it exceeds the specification, replace the valve and/or the valve guide.
Valve stem to guide clearance (Standard)
IN: 0.024-0.069 mm (0.0009-0.0027 in)
EX: 0.029-0.074 mm (0.0012-0.0029 in)
Valve stem to guide clearance (Maximum) 0.10 mm (0.004 in)





6. Measure the protrusion height (dimension A) of each valve guide without lower valve spring seat. If not within the specified, replace the valve guide.
Valve guide protrusion height (standard) 12.2-12.8 mm (0.481-0.503 in)