6-30 POWER UNIT
Valve stem outside diameter
Using micrometer, measure valve stem outside diameter.
Valve stem outside diameter :
Standard:
IN 5.965 – 5.980 mm (0.2348 – 0.2354 in.)
EX 5.940 – 5.955 mm (0.2339 – 0.2344 in.)
Valve guide inside diameter
Using a small bore gauge, measure valve guide inside diam-
eter.
Valve guide inside diameter :
Standard :
IN 6.000 – 6.012 mm (0.2362 – 0.2367 in.)
EX 6.000 – 6.012 mm (0.2362 – 0.2367 in.)
Valve guide to valve stem clearance
Valve guide to valve stem clearance :
Standard :
IN 0.020 – 0.047 mm (0.0008 – 0.0019 in.)
EX 0.045 – 0.072 mm (0.0018 – 0.0028 in.)
Service limit :
IN 0.070 mm (0.0028 in.)
EX 0.090 mm (0.0035 in.)
If measurement exceeds service limit, replace valve and/or valve
guide.
NOTE:
For valve guide replacement, see “VALVE GUIDE REPLACE-
MENT” section on page 6-35.
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VALVE / VALVE GUIDE
Valve guide to valve stem clearance
Using a micrometer and bore gauge, take diameter readings
on valve stems and guides to check guide to stem clearance.
Be sure to take readings at more than one place along length
of each stem and guide.
\ 09900-20205 : Micrometer
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