Valve

Make

Alfa Romeo

Model

155 Factory Service Manual

Year

1992–1998

Section

Valve seatings and Valve › Valve

Engine – mechanical (Twin Spark)Valve

Outer diameter of valve seat (a)	Intake	45.100 ÷ 45.116
	Exhaust	39.095 ÷ 39.111
Valve seat taper (α)	90° ± 20°
Interference between valve seat and housing	Intake	0.075 ÷ 0.116
	Exhaust	0.070 ÷ 0.111
Cylinder head shrink-fit temperature for installation of valve seatings	100 ÷ 120°C

Valve

Diameter of valve stem (a)	Intake	7.970 ÷ 7.985
	Exhaust	7.945 ÷ 7.960
Diameter of valve head (b)	Intake	43.850 ÷ 44.000
	Exhaust	37.850 ÷ 38.000
Radial play between valve stem and guide	Intake	0.015 ÷ 0.045
	Exhaust	0.040 ÷ 0.070

03 Engine