Valve and Guide Inspection

1. Measure the inside diameter of the valve guide.
Intake and Exhaust Valve Guide ID: 6.000-6.012 mm (0.2362-0.2366 inch)
2. Excessive valve stem to guide clearance may cause a noisy valve train, premature valve stem oil seal wear, component damage, and/or excessive oil consumption. Insufficient valve stem to guide clearance will result in noisy or sticking valves. Valves that are too tight may disturb engine smoothness or lead to component damage.
3. If the valve guide diameter exceeds specifications, replace the valve and the valve guide.





4. Measure the outside diameter of the valve stem using a micrometer.
Intake Valve Stem OD: 5.965-5.980 mm (0.2348-0.2354 inch)
Exhaust Valve Stem OD: 5.940-5.955 mm (0.2339-0.2344 inch)
5. To obtain the valve guide oil (stem-to-guide) clearance, subtract the valve stem outside diameter measurement from the valve guide inside diameter measurement.
Standard Intake Valve Oil Clearance: 0.020-0.047 mm (0.0008-0.0018 inch)
Maximum Intake Valve Oil Clearance: 0.07 mm (0.0027 inch)
Standard Exhaust Valve Oil Clearance: 0.045-0.072 mm (0.0018-0.0028 inch)
Maximum Exhaust Valve Oil Clearance: 0.09 mm (0.0035 inch)
6. If the clearance is greater than the maximum, replace the valve and the valve guide.