Valve guides

Make

Alfa Romeo

Model

155 Factory Service Manual

Year

1992–1998

Section

Cylinder heads › Valve guides

Engine – mechanical (V6)Valve guides

Unit: mm
	Diameter of valve guide seating (a)	13.990 ÷ 14.018
	Valve guide protrusion (b)	10.2 ÷ 10.6
	Diameter of valve cup seating (c)	Intake 35.000 ÷ 35.025
	Diameter of valve guide seating (d)	Exhaust 22.000 ÷ 22.021
	Diameter of valve seat housing (e)	Intake 42.000 ÷ 42.025 Exhaust 37.000 ÷ 37.025
	Minimum permissible height of the head after facing (f)	124.85 ÷ 125.15
	Maximum error of flatness of head lower plane	0.05
	Inclination of head upper surface	7'55" + 8'5"

Valve guides

Unit: mm
	Outer diameter of valve guide (a)	14.048 ÷ 14.059 14.062 ÷ 14.073 (1)
	Inner diameter of valve guide (reaming) (b)	9.000 ÷ 9.015
	Interference between valve guide and seating	0.030 ÷ 0.069 0.044 ÷ 0.083 (1)

(1) Valid only for spare parts

07 Engine