5-28
POWR
E
VALVES
CHECKING THE VALVE
5
1. Check:
• Valve
Damage/warpage
→
Replace.
2. Measure:
• Margin thickness
a
Out of specification
→
Replace.
Margin thickness
IN: 0.8 - 1.2 mm
(0.031 - 0.047 in)
EX: 1.0 - 1.4 mm
(0.039 - 0.055 in)
a
5300
3. Measure:
• Valve stem diameter
a
Out of specification
→
Replace.
Valve stem diameter
IN: 5.975 - 5.990 mm
(0.2352 - 0.2358 in)
EX: 5.960 - 5.975 mm
(0.2346 - 0.2352 in)
a
5310
4. Measure:
• Valve stem runout
Out of specification
→
Replace.
NOTE:
The valve guide, valve seal, and valve
should be replaced as a set.
Valve stem runout limit
IN and EX
0.01 mm (0.0004 in)
5320