Service manual

ENG
4-23
3. Remove:
• Upper spring seat
• Inner valve spring
• Outer valve spring
•Valve
• Lower spring seat
• Valve stem seal
N
O
TE:N
O
TE:
Identify the position of each part very carefully
so that it can be reinstalled in its original place.
CHECKING THE VALVES AND VALVE
GUIDES
The following procedure applies to all of the
valves and valve guides.
1. Measure:
• Valve-stem-to-valve-guide clearance
Out of specification → Replace the valve
guide.
Valve-stem-to-valve-guide clearance =
Valve guide inside diameter -
Valve stem diameter
Valve-stem-to-valve-guide
clearance
Valve-stem-to-valve-guide
clearance (intake)
0.010 ~ 0.037 mm
(0.0004 ~ 0.0015 in)
Limit
0.080 mm (0.003 in)
Valve-stem-to-valve-guide
clearance (exhaust)
0.025 ~ 0.052 mm
(0.0010 ~ 0.0020 in)
Limit
0.100 mm (0.004 in)
VALVES AND VALVE SPRINGS