Vauxhall Workshop Service and Repair Manuals > Omega B > J Engine and Engine Aggregates | OHC Petrol Engine | Cylinder Head | Repair Instructions | Cylinder head - 20 SE, X 20 SE

Torque guideline values - 20 SE, X 20 SE (OHC Engine) > < Checking and adjusting values - 20 SE, X 20 SE

Cylinder head - 20 SE, X 20 SE

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

Object Number: 2399079 Size: DEFAULT

Engine			20 SE, X 20 SE

Cylinder head height 1)		mm	95.75 – 96.25
Valve seat width in cylinder head
	Intake valve	mm	1.0 – 1.5
	Exhaust valve	mm	1.7 – 2.2
Valve seat angle in cylinder head			90°
Valve guide inside diameter
	Standard size	mm	7.030 – 7.050
	Oversize (0.075)	mm	7.105 – 7.125
Length of valve guide
	Intake valve	mm	45.5
	Exhaust valve	mm	45.5
Installation height of valve guide
	Intake valve	mm	83.25 – 84.05
	Exhaust valve	mm	83.25 – 84.05
Installation height of valves		mm	17.85 – 18.25

Engine				20 SE, X 20 SE

Valve length
	Standard size
		Intake valve (GM)	mm	104 – 104.4
		Exhaust valve (GM)	mm	103.75 – 104.25
	Oversize (0.075)
		Intake valve (GM K1)	mm	103.6 – 104
		Exhaust valve (GM K1)	mm	103.35 – 103.85

Engine				20 SE, X 20 SE

Ø Valve stem
	Standard size
		Intake valve (GM)	mm	6.998 – 7.012
		Exhaust valve (GM)	mm	6.978 – 6.992
	Oversize (0.075)
		Intake valve (GM K1)	mm	7.073 – 7.087
		Exhaust valve (GM K1)	mm	7.053 – 7.067

Engine			20 SE, X 20 SE

Valve stem play
	Intake valve	mm	0.018 – 0.052
	Exhaust valve	mm	0.038 – 0.072
Perm. runout of the valve stem		mm	0.03
Ø Valve head
	Intake valve	mm	41.8
	Exhaust valve	mm	36.5
Valve seat angle at valve head			92°
Valve rotator
	Intake valve		none
	Exhaust valve		none

Engine				20 SE, X 20 SE

Camshaft
	Cam lift
		Intake	mm	11.007
		Exhaust	mm	11.007

1 ) Resurfacing of the cylinder head is not permitted.

Related Literature Units
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J Engine and Engine Aggregates
OHC Petrol Engine
Cylinder Head / Repair Instructions
Cylinder head - 20 SE, X 20 SE

Torque guideline values - 20 SE, X 20 SE (OHC Engine) > < Checking and adjusting values - 20 SE, X 20 SE