Valve, Valve Guide Inspection
VALVE, VALVE GUIDE INSPECTION1. Measure the valve head margin thickness of each valve.
- If it is less than the specification. replace the valve.
Margin thickness
IN: 1.62 mm {0.0637 inch}
EX: 1.82 mm {0.0716 inch}
2. Measure the length of each valve. Replace the valve if necessary.
- If it is less than the specification, replace the valve.
Standard length L
IN: 102.99 - 103.79 mm {4.055 - 4.086 inch}
EX: 104.25 - 105.05 mm {4.105 - 4.135 inch}
Minimum length L
IN: 102.99 mm {4.055 inch}
EX: 104.25 mm {4.104 inch}
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.
Standard diameter
IN: 5.470 - 5.485 mm {0.2154 - 0.2159 inch}
EX: 5.465 - 5.480 mm {0.2152 - 0.2157 inch}
Minimum diameter
IN: 5.440 mm {0.2142 inch}
EX: 5.435 mm {0.2140 inch}
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.
Standard Inner diameter
5.509 - 5.539 mm {0.2169 - 0.2180 inch}
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.
Standard clearance
IN: 0.024 - 0.069 mm (0.0009 - 0.0027 inch}
EX: 0.029 - 0.074 mm {0.0012 - 0.0029 inch}
Maximum clearance 0.10 mm {0.004 inch}
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.
Standard height 12.2 - 12.8 mm {0.481 - 0.503 inch}