Valve guides

Make

Alfa Romeo

Model

155 Factory Service Manual

Year

1992–1998

Section

Cylinder heads › Valve guides

Engine – mechanical (Twin Spark)Valve guides

Unit: mm

Diameter of valve guide seating (a)	15.000 ÷ 15.018
Valve guide protrusion (b)	9.850 ÷ 10.150
Diameter of valve cup seating (c)	35.000 ÷ 35.025
Diameter of valve seat housing (d)	Intake	45.000 ÷ 45.025
	Exhaust	39.000 ÷ 39.025
Minimum permissible height of the head after facing (e)	134.900
Maximum error of parallelism between head planes	0.087
Maximum error of flatness of head lower plane	0.05

Valve guides

Unit: mm

Outer diameter of valve guide (a)	Intake	15.039 ÷ 15.050
	Exhaust	15.050 ÷ 15.068
Inner diameter of valve guide (bore) (b)	8.000 ÷ 8.015
Interference between valve guide and seating	Intake	0.021 ÷ 0.050
	Exhaust	0.032 ÷ 0.068

03 Engine