SPEC
MAINTENANCE SPECIFICATIONS
2-5
Item Standard Limit
Valve, valve seat, valve guide
Valve clearance (cold) IN 0.10 – 0.14 mm (0.0039 – 0.0055 in) ----
EX 0.16 – 0.20 mm (0.0063 – 0.0079 in) ----
Valve dimensions
“A” head diameter IN 19.40 – 19.60 mm (0.7638 – 0.7717 in) ----
EX 16.90 – 17.10 mm (0.6654 – 0.6732 in) ----
“B” face width IN 1.583 – 2.138 mm (0.060 – 0.0842 in) ----
EX 1.538 – 2.138 mm (0.0606 – 0.0842 in) ----
“C” seat width IN 0.9 – 1.1 mm (0.035 – 0.043 in) 1.6 mm
(0.0630 in)
EX 0.9 – 1.1 mm (0.035 – 0.043 in) 1.6 mm
(0.0630 in)
“D” margin thickness IN 0.5 – 0.9 mm (0.20 – 0.36 in) ----
EX 0.5 – 0.9 mm (0.20 – 0.36 in) ----
Valve stem outside diameter IN 4.475 – 4.490 mm (0.1762 – 0.1768 in) 4.450 mm
(0.1752 in)
EX 4.460 – 4.475 mm (0.1756 – 0.1762 in) 4.435 mm
(0.1746 in)
Guide inside diameter IN 3.950 – 4.050 mm (0.1555 – 0.1594 in) 4.542 mm
(0.1788 in)
EX 3.950 – 4.050 mm (0.1555 – 0.1594 in) 4.542 mm
(0.1788 in)
Valve-stem-to-guide clearance IN 0.0010 – 0.037mm (0 – 0.0015 in) 0.080 mm
(0.0032 in)
EX 0.025 – 0.052 mm (0.0010 – 0.0020 in) 0.100 mm
(0.0039 in)
Valve stem runout limit ---- 0.01 mm
(0.0004 in)
Valve seat width IN/EX 0.9 – 1.1 mm (0.035 – 0.043 in) 1.6 mm
(0.0630 in)
A
HdDi
Head Diameter
C
Seat Width
D
Margin Thickness
B
Face Width
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