Suzuki RA410 Manual page 304

45
INSPECTION
Valve Guides
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.
Item
In
Valve stem
diameter
Ex
In
Valve guide
I.D.
Ex
In
Stem-to-guide
clearance
Ex
If bore gauge is not available, check end deflection of valve stem
with a dial gauge instead.
Move stem end in directions
If deflection exceeds its limit, replace valve stem and valve guide.
Valve stem end deflection
limit
Valves
Remove all carbon from valves.
Inspect each valve for wear, burn or distortion at its face and
stem end, as necessary, replace it.
Measure thickness of valve head. If measured thickness ex-
ceeds limit, replace valve.
Standard
IN 1.0 mm (0.039 in.)
EX 1.15 mm (0.045 in.)
ENGINE MECHANICAL 6A4-45
Standard
5.465 – 5.480 mm
(0.2152 – 0.2157 in.)
5.440 – 5.455 mm
(0.2142 – 0.2148 in.)
5.500 – 5.512 mm
(0.2166 – 0.2170 in.)
0.020 – 0.047 mm
(0.0008 – 0.0018 in.)
0.045 – 0.072 mm
(0.0018 – 0.0028 in.)
and to measure end deflection.
In 0.14 mm (0.005 in.)
Ex 0.18 mm (0.007 in.)
Valve head thickness
0.7 mm (0.027 in.)
0.5 mm (0.020 in.)
Limit
–
–
– –
0.07 mm
(0.0027 in.)
0.09 mm
(0.0035 in.)
Limit