CYLINDER HEAD ASSEMBLY
EMA -75
3)
Calculate the clearance between the valve
guides and the stems by difference between the
valve stem measured diameter and the valve
guide measured inside diameter.
Valve stem-to-guide clearance
[Standard]
Intake : 0.020 ~ 0.050mm (0.0008 ~ 0.0020in.)
Exhaust : 0.035 ~ 0.065mm (0.0014 ~ 0.0026in.)
[Limit]
Intake : 0.10mm (0.0039in.) or less
Exhaust : 0.13mm (0.0051in.) or less
2.
Inspect valves.
1)
Check the valve face angle.
2)
Check that the surface of the valve for wear.
If the valve face is worn, replace the valve.
3)
Check the valve head margin thickness.
If the margin thickness is less than the specifica-
tion, replace the valve.
Specification
Intake : 1.0mm(0.0394in.)
Exhaust : 1.3mm(0.0512.)
Margin
ECKD221A
4)
Check the valve length.
Length
Intake : 110.1mm(4.3346in)
Exhaust : 111.1mm(4.3740in)
5)
Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, replace the valve.
3.
Inspect valve seats
1)
Check the valve seat for evidence of overheating
or improper contact with the valve face.
If the valve seat is worn, replace cylinder head.
2)
Before reconditioning the seat, check the valve
guide for wear. If the valve guide is worn, replace
the valve guide first.
3)
Recondition the valve seat with a valve seat
grinder or cutter. The valve seat contact width
should be within specifications and centered on
the valve face.
4.
Inspect valve springs.
1)
Using a steel square, measure the out-of-square
of the valve spring.
2)
Using vernier calipers, measure the free length
of the valve spring.
Valve spring
[Standard]
Free height : 46.8mm (1.8425in.)
Out-of-square : 1.5
˚
or less
KCRF205A