CYLINDER HEAD ASSEMBLY
EMA -49
3)
Subtract the valve stem outer diameter measure-
ment from the valve guide inner diameter mea-
surement.
Valve stem- to-guide clearance
Intake : 0.030 ~ 0.057mm (0.0012 ~ 0.0022in)
Exhaust : 0.050 ~ 0.077mm (0.0020 ~ 0.0030in)
If the clearance is greater than specification, re-
place the valve and valve guide.
2.
Inspect the valves.
1)
Check the valve is ground to the correct valve
face angle.
2)
Check that the surface of 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 specification, re-
place the valve.
Margin
Intake : 1.1mm (0.0433in)
Exhaust : 1.2mm (0.0472in)
Margin
ECKD221A
4)
Check the valve length.
Length
Intake : 93.0mm (3.6614in)
Exhaust : 93.7mm (3.6890in)
5)
Check the surface of valve stem tip for wear.
If the valve stem tip is worn, replace the valve.
3.
Inspect the valve seats.
1)
Check the valve seat for evidence of overheating
and improper contact with the valve face.
Replace the seat if necessary.
2)
Before reconditioning the seat, check the valve
guide for wear. If the valve guide is worn, replace
it, then recondition the seat.
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.
1.2 ~ 1.8 mm
0.8 ~ 1.4 mm
Pilot
Exhaust
Intake
Cutter
BCGE009B