Valve Guide Clearance
MeasureTool Required:
J 26900-14 Small Hole Gages
1. Valve guide bushing,diameter using a J 26900-14. Record measurements. Standard inside diameter specification is 6.01 to 6.03 mm (0.2366 to 2.374-inch).
2. Valve stem diameter.
3. Subtract valve stem diameter from corresponding valve guide bushing diameter to obtain oil clearance.
- Standard oil clearance for intake valves is 0.025 to 0.060 mm (0.0010 to 0.0024-inch). Standard oil clearance for exhaust valves is 0.030 to 0.065 mm (0.0012 to 0.0026-inch). If intake valve oil clearance is greater than 0.08 mm (0.0031-inch) or exhaust valve oil clearance is greater than 0.10 mm (0.0039-inch), replace the valve and measure oil clearance again. If the oil clearance still exceeds the maximum specification, then replace the valve guide bushing.