Hisun HS400 Service Manual page 51

Valve Dimensions
Head Diameter
Item
"A" head diameter
"B" face width
"C" seat width
"D" margin thickness
Stem outside diameter
Guide inside diameter
Item
Stem-to-guide
clearance
IN
EX
Stem runout limit
Valve seat width
IN
EX
Specifications
Face Width
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
IN
EX
Metric
0.010 - 0.037 mm (0.0004 - 0.0015 in)
0.025 - 0.052 mm (0.0010 - 0.0020 in)
1.1 - 1.3 mm (0.0433 - 0.0512 in)
1.1 - 1.3 mm (0.0433 - 0.0512 in)
Seat Width
Metric
39.90 - 40.1mm
33.90 - 33.98 mm
2. 5 mm
4.2 mm
1.1 - 1.3 mm
1.1 - 1.3 mm
1.2 - 1.1 mm
1.0 - 1.1 mm
6.97 - 6.98mm
6.96 - 6.97 mm
7.000 - 7.015 mm
7.000 - 7.015 mm
Standard
2-8
Margin Thickness
Standard
(1.5709 - 1.5787 in)
(1.3346 - 1.3378 in)
(0.0984 in)
(0.1654 in)
(0.0433 - 0.0512 in)
(0.0433 - 0.0512 in)
(0.0472 - 0.0433 in)
(0.0394 - 0.0433 in)
(0.2744 - 0.2748 in)
(0.2740 - 0.2744 in)
(0.2756- 0.2762 in)
(0.2756- 0.2762 in)
Service Wear Limit
0.08 mm (0.0031 in)
0.10 mm (0.0039 in)
0.01 mm (0.0004 in)