Page 460 - Foton Workshop Manual - Sauvana

12C-20 ENGINE MECHANICAL SYSTEM - CYLINDER HEAD SYSTEM

(b). Check the valve top.
•Use the precision ruler to measure the
valve head edge thickness a and record
it.
•Check whether the contact belt
b
circumference is evenly distributed and
whether located at the center of valve
a inclined surface , and measure the valve
head contact width b using the precision
fuwx12C052 ruler.

Measurement item Size (mm)

Intake valve head edge 1.95 ~ 2.25
thickness a
Exhaust valve head edge 2.65 ~ 2.95
thickness a

Intake head contact width b 1.1 ~ 1.5
Exhaust head contact width b 1.0 ~ 1.3

If not within the specified range, replace
the valve.

(c). Check the valve stem diameter.
Use the external micrometer to measure
the valve stem diameter.

Measurement item Size (mm)

Intake valve stem diameter 5.973 ~ 5.987

Exhaust valve stem 5.958 ~ 5.972
diameter
If not within the specified range, replace
fuwx12C053
the valve.

Page 460