Cylinder Head (X 25 XE, Y 26 SE) 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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X 25 XE, Y 26 SE |
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Cylinder head height |
mm |
134 1) |
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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 |
° |
90 |
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Valve guide inside diameter |
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Standard size |
mm |
6.000 to 6.012 |
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Oversize (0.075) |
mm |
6.075 to 6.090 |
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Oversize (0.150) |
mm |
6.150 to 6.165 |
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Length of valve guide |
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Intake valve |
mm |
44.70 to 45.30 |
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Exhaust valve |
mm |
34.70 to 35.30 |
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Installation height of valve guide |
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Intake valve |
mm |
13.7 to 14.0 |
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Exhaust valve |
mm |
13.7 to 14.0 |
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Installation height of valves |
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Standard size |
mm |
39.6 to 40.2 |
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Oversize (0.075) |
mm |
39.2 to 39.8 |
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Oversize (0.150) |
mm |
39.2 to 39.8 |
1) Resurfacing of the cylinder head is not permitted.
Cylinder Head (Continued)
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Engine |
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X 25 XE, Y 26 SE |
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Valve length |
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Standard size |
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Intake valve (GM) |
mm |
101.90 to 102.10 |
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Exhaust valve (GM) |
mm |
92.05 to 92.25 |
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Oversize (0.075) |
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Intake valve (GM K1) |
mm |
101.50 to 101.90 |
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Exhaust valve (GM K1) |
mm |
91.65 to 92.05 |
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Oversize (0.150) |
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Intake valve (GM K2) |
mm |
101.50 to 101.90 |
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Exhaust valve (GM K2) |
mm |
91.65 to 92.05 |
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Ø Valve stem |
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Standard size |
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Intake valve (GM) |
mm |
5.955 to 5.970 |
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Exhaust valve (GM) |
mm |
5.945 to 5.960 |
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Oversize (0.075) |
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Intake valve (GM K1) |
mm |
6.030 to 6.045 |
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Exhaust valve (GM K1) |
mm |
6.020 to 6.035 |
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Oversize (0.150) |
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Intake valve (GM K2) |
mm |
6.105 to 6.120 |
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Exhaust valve (GM K2) |
mm |
6.095 to 6.110 |
Cylinder Head (Continued)
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Engine |
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X 25 XE, Y 26 SE |
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Valve stem play |
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Intake valve |
mm |
0.03 to 0.057 |
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Exhaust valve |
mm |
0.04 to 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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Intake valve |
mm |
31.9 to 32.1 |
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Exhaust valve |
mm |
28.9 to 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 |
mm |
none |
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Exhaust valve |
mm |
none |
Cylinder Head (Continued)
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Engine |
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X 25 XE, Y 26 SE |
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Camshaft |
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Radial runout |
mm |
0.06 |
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End play |
mm |
0.04 to 0.144 |
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Cam lift |
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Intake valve |
mm |
9.2 |
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Exhaust valve |
mm |
9.2 |
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