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Wiring diagrams Section: DOHC Petrol Engine

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Cylinder Head Opel Astra G

DOHC Petrol Engine 1 illustration

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

Engine			Z 16 XEP
Cylinder head height 1)		mm
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'
Valve guide inside diameter
	Standard size	mm	5.000 - 5.016
	Oversize (0.075)	mm	5.075 - 5.091
	Oversize (0.150)	mm	5.150 - 5.166
Length of valve guide
	Intake valve	mm	36.7 - 37.3
	Exhaust valve	mm	36.7 - 37.3
Installation height of valve guide
	Intake valve	mm	10.7 – 11.0
	Exhaust valve	mm	10.7 – 11.0
Installation height of valves
	Standard size	mm
	Oversize (0.075)	mm
	Oversize (0.150)	mm

Engine				Z 16 XEP
Valve length
	Standard size
		Intake valve (GM F)	mm	117.10 - 117.30
		Exhaust valve (GM B)	mm	116.16 - 116.36
	Oversize (0.075)
		Intake valve (GM FK1)	mm
		Exhaust valve (GM BK1)	mm
	Oversize (0.150)
		Intake valve (GM FK2)	mm
		Exhaust valve (GM BK2)	mm
Ø	Valve stem
	Standard size
		Intake valve (GM F)	mm	4.955 – 4.970
		Exhaust valve (GM B)	mm	4.935 – 4.950
	Oversize (0.075)
		Intake valve (GM FK1)	mm	5.030 – 5.045
		Exhaust valve (GM BK1)	mm	5.010 – 5.025
	Oversize (0.150)
		Intake valve (GM FK2)	mm	5.105 – 5.120
		Exhaust valve (GM BK2)	mm	5.085 - 5.100

Engine				Z 16 XEP
Valve stem play
		Intake valve	mm	0.030 - 0.061
		Exhaust valve	mm	0.050 - 0.081
perm. runout of the valve stem			mm	0.03
Ø Valve head
		Intake valve	mm	30.7 - 30.8
		Exhaust valve	mm	27.1 - 27.2
Valve seat angle at valve head				90° 40'
Valve rotator
		Intake valve		No code
		Exhaust valve		No code

Engine				Z 16 XEP
Camshaft
	Cam lift
		Intake	mm
		Exhaust	mm

Engine				Z 16 XEP
Valve play
	Nominal values
		Intake	mm	0,25
		Exhaust	mm	0,30
	Permissible valve clearance
		Intake	mm	0.21 - 0.29
		Exhaust	mm	0.27 – 0.35

Cup tappet graduation for service
Engine		Z 16 XEP
Número-índice		Dimension
04	mm	3,030 - 3,050
08	mm	3,070 - 3,090
12	mm	3,110 - 3,130
16	mm	3,150 - 3,170
20	mm	3,190 - 3,210
24x	mm	3,230 - 3,244
27x	mm	3,258 - 3,272
30x	mm	3,286 - 3,300
32x	mm	3,314 - 3,328
35x	mm	3,342 - 3,356
38x	mm	3,370 - 3,384
41x	mm	3,398 - 3,412
43x	mm	3,426 - 3,440
47	mm	3,460 - 3,480
51	mm	3,500 - 3,520
55	mm	3,540 - 3,560
59	mm	3,580 - 3,600

1

) Resurfacing of the cylinder head is not permitted.