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Valves and Valve Guides Inspection
Valve Guide
Valve stem-to-guide clearance
Using a micrometer and bore gauge, take diameter readings on valve stems and guides to check stem-to-guide
clearance.
Be sure to take reading at more than one place along the length of each stem and guide.
If clearance exceeds limit, replace valve and valve guide.
Valve stem and valve guide specification
Item
Valve stem diameter [A]
Valve guide bore [B]
Stem-to-guide clearance
Valve stem end deflection
If bore gauge is not available, check end deflection of valve stem with a dial gauge instead.
Move stem end in directions (1) and (2) to measure end deflection.
If deflection exceeds its limit, replace valve stem and valve guide.
Valve stem end deflection limit
In: 0.14 mm (0.005 in.)
Ex: 0.18 mm (0.007 in.)
In
5.965 – 5.980 mm (0.2348 – 0.2354 in.)
Ex
5.940 – 5.955 mm (0.2339 – 0.2344 in.)
In & Ex
6.000 – 6.012 mm (0.2362 – 0.2366 in.)
In
0.020 – 0.047 mm (0.0008 – 0.0018 in.)
Ex
0.045 – 0.072 mm (0.0017 – 0.0028 in.)
Standard
IYSQ01141096-01
Engine Mechanical:
1D-40
S6RW0C1406030
Limit
—
—
—
0.070 mm (0.0028 in.)
0.090 mm (0.0035 in.)
I4RS0B140016-01
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