Valve Guide

Measure clearance between the valve guide and valve stem. If the clearance exceeds the limit, replace the valve guide or valve, or both.

Standard value: 

Intake 0.020 - 0.047 mm (0.0008 - 0.0019 inch) 

Exhaust 0.030 - 0.054 mm (0.0012 - 0.0021 inch) 

Limit: 

Intake 0.10 mm (0.004 inch) 

Exhaust 0.11 mm (0.004 inch) 

Fig 1: Measuring Stem Diameter And Clearance Between Valve Guide And Valve Stem

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.