Valve Guide / Valve Inspection - Segway VILLIAN SSV Series Service Manual

CYLINDER HEAD, CYLINDER, PISTON CYLINDER HEAD, CYLINDER, PISTON
B B
◆ Measure the free length of each valve spring with
a vernier caliper and compare it with the standard
value.
◆ Free length of valve spring:standard:1.726" (43.85
mm)，service limit:1.683" (42.75 mm)
Top
42.5 mm (1.6732")
bottom

Valve guide / valve inspection

◆ Valve stem clearance measurement:
If there is no small aperture gauge, use the swing method
to measure the gap between the valve and the valve
guide and check the wear of the valve guide. The method
is as follows.
◆ Insert a new valve 【A】 into the valve guide 【B】,
and place a dial indicator perpendicular to the valve
A A
stem on the valve stem, as close as possible to the
cylinder head mating surface.
◆ Swing the valve lever to measure the valve/valve
guide gap.
◆ Repeat the measurement in the direction at right
angles to the first direction. If the reading exceeds
the use limit, replace the cylinder head and camshaft
cover assembly.
TIPS
The reading is not the true gap between the valve and
the valve guide, because the measurement position is
above the guide.
Valve/valve guide clearance (swing method)
exhaust:
Air intake:
◆ Measure the beating, pitting and ablation of the
valve stem. Check whether the valve rod is bent,
clamp the valve on the machine tool or use a "V"
block and measure it with a dial indicator.
◆ Check whether there is flaring, pitting, abrasion or
damage at the end of the valve stem.
◆ Check whether there is flaring or abrasion at the
lock clip groove. .
3-5-29
Standard
Standard
0.09 ~ 0.17 mm(0.0035" ~ 0.0067")
0.03 ~ 0.11 mm(0.0012" ~ 0.0043")
Limit
41.4mm (1.6299")
Limit
0.34 mm
0.0133"
0.28 mm
0.0110"