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Cylinder head

Cylinder head



1. Cylinder head height

2. Fitting height, valve guide

3. Fitting height, valve

4. Valve seat width in cylinder head

5. Valve seat angle in cylinder head

6. Diameter of valve stem

7. Valve seat angle on valve

8. Valve length

9. Diameter of valve head


Engine Z 18 XE
Cylinder head height mm 135,85 - 136,0
Valve seat width in cylinder head Intake valve, mm 1,0 - 1,4
Exhaust valve, mm 1,4 - 1,8
Valve seat angle in cylinder head 90° -30'
Inside diameter of valve guides Normal dimension, mm 5,000 - 5,012
Oversize (0.075), mm 5,075 - 5,087
Oversize (0.150), mm 5,150 - 5,162
Length of valve guide Intake valve, mm 38,7 - 39,3
Exhaust valve, mm 38,7 - 39,3
Fitting height, valve guide Intake valve, mm 10,7 - 11,0
Exhaust valve, mm 10,7 - 11,0
Fitting height, valve Normal dimension, mm 38,5 - 39,2
Oversize (0.075), mm 38,1 - 39,6
Oversize (0.150), mm 38,1 - 39,6


Engine Z 18 XE
Valve stem clearance Intake valve, mm 0.030 - 0.057
Exhaust valve, mm 0,050 - 0,077
Permitted valve stem stroke mm 0,03
Ø Valve head Intake valve, mm 31,1 - 31,3
Exhaust valve, mm 27,4 - 27,6
Valve seat angle on valve head 90° 40'
Valve rotator Intake valve without
Exhaust valve without