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Cylinder head
Illustration
| 1. |
Cylinder head height |
| 2. |
Installation height of valve guide |
| 3. |
Installation height of valve |
| 4. |
Valve seat width in cylinder head |
| 5. |
Valve seat angle in cylinder head |
| 6. |
Valve stem diameter |
| 7. |
Valve seat angle at valve |
| 8. |
Valve length |
| 9. |
Valve head – diameter |
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Engine
|
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X 20 XEV, X 20 XER, Z 20 LET
|
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Cylinder head height 1)
|
mm
|
134
|
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Valve seat width in cylinder head
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Intake valve
|
mm
|
1.0 to 1.4
|
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Exhaust valve
|
mm
|
1.4 to 1.8
|
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Valve seat angle in cylinder head
|
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90°
|
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Valve guide inside diameter
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Standard size
|
mm
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6.000 – 6.012
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|
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Oversize (0.075)
|
mm
|
6.075 – 6.090
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Length of valve guide
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Intake valve
|
mm
|
44.70 – 45.30
|
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Exhaust valve
|
mm
|
34.70 – 35.30
|
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Installation height of valve guide
|
|
|
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|
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Intake valve
|
mm
|
13.7 – 14.0
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|
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Exhaust valve
|
mm
|
13.7 – 14.0
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Installation height of valves
|
|
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|
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Standard size
|
mm
|
39.6 – 40.2
|
|
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Oversize (0.075)
|
mm
|
39.2 – 39.8
|
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Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
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Valve length
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Standard size
|
|
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Intake valve (GM)
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mm
|
101.90 – 102.30
|
|
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Exhaust valve (GM)
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mm
|
92.05 – 92.45
|
|
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Oversize (0.075)
|
|
|
|
|
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Intake valve (GM K1)
|
mm
|
101.50 – 101.90
|
|
|
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Exhaust valve (GM K1)
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mm
|
91.65 – 92.05
|
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Ø Valve stem
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Standard size
|
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|
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Intake valve (GM)
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mm
|
5.955 – 5.970
|
|
|
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Exhaust valve (GM)
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mm
|
5.945 – 5.960
|
|
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Oversize (0.075)
|
|
|
|
|
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Intake valve (GM K1)
|
mm
|
6.030 – 6.045
|
|
|
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Exhaust valve (GM K1)
|
mm
|
6.020 – 6.035
|
|
Engine
|
|
X 20 XEV, X 20 XER, Z 20 LET
|
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|
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Valve stem play
|
|
|
|
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Intake valve
|
mm
|
0.030 – 0.057
|
|
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Exhaust valve
|
mm
|
0.040 – 0.067
|
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perm. runout of the valve stem
|
mm
|
0.03
|
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Ø Valve head
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|
|
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Intake valve
|
mm
|
31.9 – 32.1
|
|
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Exhaust valve
|
mm
|
28.9 – 29.1
|
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Valve seat angle at valve head
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90° 40'
|
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Valve rotator
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Intake valve
|
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No code
|
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Exhaust valve
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No code
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Engine
|
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X 20 XEV
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X 20 XER
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Z 20 LET
|
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Camshaft
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Cam lift
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Intake
|
mm
|
9.2
|
10.6
|
8.5
|
|
|
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Exhaust
|
mm
|
9.2
|
10.6
|
8.5
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1 ) Resurfacing of the cylinder head is not
permitted.
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