Vauxhall Workshop Service and Repair Manuals

 

Cylinder Head (X 20 DTL, X 20 DTH)   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

Cylinder Head (Continued)  

Engine			X 20 DTL, X 20 DTH
Cylinder head height 1)		mm	140
Valve seat width in cylinder head
	Intake valve	mm	1.4 - 1.8
	Exhaust valve	mm	1.4 - 1.8
Valve seat angle in cylinder head			90 °
Valve guide inside diameter
	Standard size	mm	6.000 - 6.012
	Oversize (0.075)	mm	6.075 - 6.090
	Oversize (0.150)	mm	6.150 - 6.165
Length of valve guide
	Intake valve	mm	44.75 - 45.25
	Exhaust valve	mm	34.75 - 35.25
Installation height of valve guide
	Intake valve	mm	11.2 - 11.5
	Exhaust valve	mm	11.2 - 11.5
Installation height of valves
	Standard size	mm	37.0 - 37.6
	Oversize (0.075)	mm	36.6 - 37.2
	Oversize (0.150)	mm	36.6 - 37.2

1)  Resurfacing of the cylinder head is not permitted. See corresponding illustration.  

Cylinder Head (Continued)  

Engine				X 20 DTL
Valve length
	Standard size
		Intake valve (GM)	mm	96.90 - 97.30
		Exhaust valve (GM)	mm	96.90 - 97.30
	Oversize (0.075)
		Intake valve (GM K1)	mm	96.50 - 96.90
		Exhaust valve (GM K1)	mm	96.50 - 96.90
	Oversize (0.150)
		Intake valve (GM K2)	mm	96.50 - 96.90
		Exhaust valve (GM K2)	mm	96.50 - 96.90
Ø Valve stem
	Standard size
		Intake valve (GM)	mm	5.955 - 5.970
		Exhaust valve (GM)	mm	5.945 - 5.960
	Oversize (0.075)
		Intake valve (GM K1)	mm	6.030 - 6.045
		Exhaust valve (GM K1)	mm	6.020 - 6.035
	Oversize (0.150)
		Intake valve (GM K2)	mm	6.105 - 6.120
		Exhaust valve (GM K2)	mm	6.095 - 6.110

See corresponding illustration.

Cylinder Head (Continued)  

Engine				X 20 DTH
Valve length
	Standard size
		Intake valve (GM G)	mm	96.90 - 97.30
		Exhaust valve (GM P)	mm	96.90 - 97.30
	Oversize (0.075)
		Intake valve (GM GK1)	mm	96.50 - 96.90
		Exhaust valve (GM PK1)	mm	96.50 - 96.90
	Oversize (0.150)
		Intake valve (GM GK2)	mm	96.50 - 96.90
		Exhaust valve (GM PK2)	mm	96.50 - 96.90
Ø Valve stem
	Standard size
		Intake valve (GM G)	mm	5.955 - 5.970
		Exhaust valve (GM P)	mm	5.945 - 5.960
	Oversize (0.075)
		Intake valve (GM GK1)	mm	6.030 - 6.045
		Exhaust valve (GM PK1)	mm	6.020 - 6.035
	Oversize (0.150)
		Intake valve (GM GK2)	mm	6.105 - 6.120
		Exhaust valve (GM PK2)	mm	6.095 - 6.110

See corresponding illustration.

Cylinder Head (Continued)  

Engine			X 20 DTL, X 20 DTH
Valve stem play
	Intake valve	mm	0.030 - 0.057
	Exhaust valve	mm	0.040 - 0.067
Perm. runout of the valve stem		mm	0.03
Ø Valve head
	Intake valve	mm	29.0
	Exhaust valve	mm	26.0
Valve seat angle at valve head			90 ° 40'
Valve rotator
	Intake valve		none
	Exhaust valve		none

Engine				X 20 DTL, X 20 DTH
Camshaft
	Cam lift
		Intake	mm	8.5
		Exhaust	mm	8.5

See corresponding illustration.