Valve

Make

Alfa Romeo

Model

155 Factory Service Manual

Year

1992–1998

Section

Valve seatings and Valve › Valve

Engine – mechanical (V6)Valve

Outer diameter of valve seat (a)	Intake	42.065 ÷ 42.100
	Exhaust	37.095 ÷ 37.111
Valve seat taper (α)	90° ± 20'
Interference between valve seat and housing	Intake	0.040 ÷ 0.100
	Exhaust	0.070 ÷ 0.111
Cylinder head shrink-fit temperature for installation of valve seatings	100°C

Valve

Diameter of valve stem (a)	Intake	8.957 ÷ 8.977 (1) 8.950 ÷ 8.980 (2)
	Exhaust	8.925 ÷ 8.945
Diameter of valve head (b)	Intake	40.850 ÷ 41.000 (1) 40.800 ÷ 41.000 (2)
	Exhaust	36.450 ÷ 36.600
Radial play between valve stem and guide	Intake	0.023 ÷ 0.058 (1) 0.020 ÷ 0.065 (2)
	Exhaust	0.055 ÷ 0.090

(1) Livia (2) Ate

07 Engine