Cylinder Head Illustration
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
7 Valve seat angle at valve
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Cylinder Head (Continued)
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Engine |
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12 NZ, C 12 NZ, X 12 SZ, C 14 NZ, C 14 SE, X 14 SZ |
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Cylinder head height |
mm |
95.90 - 96.10 |
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Valve seat width in cylinder head |
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Intake valve |
mm |
1.3 - 1.5 |
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Exhaust valve |
mm |
1.6 - 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 |
7.030 - 7.050 |
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Oversize (0.075) |
mm |
7.105 - 7.125 |
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Oversize (0.150) |
mm |
7.180 - 7.200 |
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Oversize (0.250) |
mm |
7.280 - 7.300 |
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Length of valve guide |
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Intake valve |
mm |
42.75 - 43.25 |
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Exhaust valve |
mm |
42.75 - 43.25 |
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Installation height of valve guide |
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Intake valve |
mm |
80.85 - 81.25 |
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Exhaust valve |
mm |
80.85 - 81.25 |
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Installation height of valves |
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Standard size |
mm |
13.75 - 14.35 |
Cylinder Head (Continued)
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Engine |
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12 NZ, C 12 NZ, X 12 SZ, C 14 NZ, C 14 SE, X 14 SZ |
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Valve length |
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Standard size |
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Intake valves (GM) |
mm |
104.65 - 105.35 |
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Exhaust valves (GM) |
mm |
104.65 - 105.35 |
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Oversize (0.075) |
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Intake valves (GM K1) |
mm |
104.25 - 104.95 |
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Exhaust valves (GM K1) |
mm |
104.25 - 104.95 |
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Oversize (0.150) |
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Intake valves (GM K2) |
mm |
104.25 - 104.95 |
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Exhaust valves (GM K2) |
mm |
104.25 - 104.95 |
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Oversize (0.250) |
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Intake valves (A) |
mm |
104.25 - 104.95 |
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Exhaust valves (A) |
mm |
104.25 - 104.95 |
Cylinder Head (Continued)
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Engine |
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12 NZ, C 12 NZ, X 12 SZ, C 14 NZ, C 14 SE, X 14 SZ |
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Ø Valve stem |
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Standard size |
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Intake valves (GM) |
mm |
6.998 - 7.012 |
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Exhaust valves (GM) |
mm |
6.978 - 6.992 |
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Oversize (0.075) |
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Intake valves (GM K1) |
mm |
7.073 - 7.087 |
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Exhaust valves (GM K1) |
mm |
7.053 - 7.067 |
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Oversize (0.150) |
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Intake valves (GM K2) |
mm |
7.148 - 7.162 |
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Exhaust valves (GM K2) |
mm |
7.128 - 7.142 |
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Oversize (0.250) |
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Intake valves (A) |
mm |
7.248 - 7.262 |
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Exhaust valves (A) |
mm |
7.228 - 7.242 |
Cylinder Head (Continued)
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Engine |
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12 NZ, C 12 NZ, X 12 SZ, C 14 NZ |
C 14 SE, X 14 SZ |
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Valve stem play |
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Intake valve |
mm |
0.018 - 0.052 |
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Exhaust valve |
mm |
0.038 - 0.072 |
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perm. runout of the valve stem |
mm |
0.03 |
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Ø Valve head |
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Intake valve |
mm |
33 |
38 |
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Exhaust valve |
mm |
29 |
31 |
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Valve seat angle at valve head |
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92 ° |
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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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12 NZ, C 12 NZ, X 12 SZ |
C 14 SE |
C 14 NZ, X 14 SZ |
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Camshaft |
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Cam lift |
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Intake |
mm |
7.452 |
9.99 |
8.36 |
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Exhaust |
mm |
8.145 |
9.99 |
9.06 |
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