Valve Guide Clearance

Valve Stem Diameter

Measure the diameter of valve stem with micrometer.

Standard 

Intake: 5.965 - 5.980 mm (0.2348 - 0.2354 in) 

Exhaust: 5.955 - 5.970 mm (0.2344 - 0.2350 in) 

Fig 1: Measuring Diameter Of Valve Stem With Micrometer

Courtesy of NISSAN NORTH AMERICA, INC.

Valve Guide Inner Diameter

Measure the inner diameter of valve guide with inside micrometer.

Standard 

Intake and Exhaust: 6.000 - 6.018 mm (0.2362 - 0.2369 in) 

Valve Guide Clearance

(Valve guide clearance) = (Valve guide inner diameter) - (Valve stem diameter).

Valve guide clearance: 

Standard 

Intake: 0.020 - 0.053 mm (0.0008 - 0.0021 in) 

Exhaust: 0.030 - 0.063 mm (0.0012 - 0.0025 in) 

Limit 

Intake: 0.08 mm (0.003 in) 

Exhaust: 0.09 mm (0.004 in) 

• If the calculated value exceeds the limit, replace valve and/or valve guide.