EMA - 44 ENGINE MECHANICAL SYSTEM
3) Subtract the valve stem diameter measurement
from the valve guid e inside diameter mea sure-
ment.
Valve stem-to-guide clearance
[Standard]
Intake : 0.020 ~ 0.047mm (0.0008 ~ 0.0018in.)
Exhaust : 0.030 ~ 0.054mm (0.0012 ~ 0.0021in.)
[Limit]
Intake : 0.07mm (0.0027in.)
Exhaust : 0.09mm (0.0035in.)
2. Inspec
tvalves.
1) Check the valve is ground to the correct valve
face angle.
2) Check that the surface of the valve for wear.
If the valve face is worn, replace the valve.
3) Check t
he valve head margin thickness.
If the m
argin thickness is less than minimum, re-
place t
he valve.
Margin
[Standard]
Intake : 1.56 ~ 1.86mm(0.06142 ~ 0.07323in.)
Exhaust : 1.73 ~ 2.03mm(0.06811 ~ 0.07992in.)
Margin
ECKD221A
4) Check the valve length.
Length
Intake : 105.27mm (4.1445in)
Exhaust : 105.50mm (4.1535in)
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
Check the valve seat for evidence of overheating and
improper contact with the valve face.
If the valve seat is worn, replace cylinder head.
Before reconditioning the seat, check the valve guide
for wear. If the valve guide is worn, replace cylin-
der head. 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 a vernier calipers, measure the free length
of the valve spring.
Valve spring
[Standard]
Free height : 43.86mm (1.7267in.)
Out-of -square : 1.5˚
KCRF205A
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