Page 409 - Foton Workshop Manual - Sauvana

ENGINE MECHANICAL - VALVE
(k). Measure the inner diameter of the valve guide with the inside caliper and count the
clearance between the valve guide and the valve stem.
Standard value:
Intake：0.020~0.050mm
Exhaust：0.030~0.060mm
Limit value:
Intake：0.10 mm
Exhaust： 0.12 mm
NOTICE:
If the clearance exceeds the limit value, replace the valve and the valve guide.
12B-119
12B
(l). Check the contact width of the valve seat.
• Spread a layer of Prussian Blue or white
lead, and install the valve on the cylinder
head.
• Rotate the valve within the range of 90°
with the valve grinding tools for several
times to take out the valve.
Standard value:1.0~1.2mm
NOTICE:
The moulage on the valve matching surface must
be the toroidal one without disconnection and the
width of the toroidal moulage must be within the
range required. If the moulage on the valve seat
and the valve contact is uneven or the width of the
moulage is out of the range required, the valve
seat must be burnished, ground and polished
again.
(m). Install the valve and measure the distance
between the valve stem end and the spring
seat surface.
• If the value measured exceeds the
limit value, replace the cylinder head
assembly.
Page 409