Valve And Valve Spring
- Inspect valve stems and valve guides.
- Using a caliper gauge, measure the inside diameter of the valve guide.
Valve Guide I.D.
Intake/Exhaust: 5.500 - 5.512 mm (0.216 - 0.217 in.)
- Using a micrometer, measure the diameter of the valve stem.
Valve Stem O.D.
Intake: 5.465 - 5.480 mm (0.2151 - 0.2157 in.)
Exhaust: 5.458 - 5.470 mm (0.2149 - 0.2153 in.)
- To measure the valve stem-to-guide clearance, subtract the valve guide inside diameter from the valve stem diameter.
Valve Stem-To-Guide Clearance
[Standard]
Intake: 0.020 - 0.047 mm (0.0008 - 0.0018 in.)
Exhaust: 0.030 - 0.054 mm (0.0012 - 0.0021 in.)
[Limit]
Intake: 0.07 mm (0.0027 in.)
Exhaust: 0.09 mm (0.0035 in.)
- Using a caliper gauge, measure the inside diameter of the valve guide.
- Inspect valves.
- Check the valve face angle with the ground.
- Check that the surface of the valve for wear.
If the wear is excessive, replace the valve.
- Check the valve head margin thickness.
If the margin thickness is less than minimum, replace the valve.
Margin:
[Standard]
Intake: 1.56 - 1.86 mm (0.06142 - 0.07323 in.)
Exhaust: 1.73 - 2.03 mm (0.06811 - 0.07992 in.)
- Check the valve length.
Length:
Intake: 105.27 mm (4.1445 in)
Exhaust: 105.50 mm (4.1535 in)
- Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, replace the valve.
- 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 the cylinder 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.
- Check the valve seat for evidence of overheating and improper contact with the valve face.
- Inspect valve springs.