Valve guides

Make

Alfa Romeo

Model

GTV / Spider GTV and Spider (916) Factory Service Manual

Year

1995–2000

Section

Technical features (T. Spark 16V) › Valve guides

00 Technical data and maintenanceValve guides

Valve guides

Unit: mm

Valve guide O.D. "a"	13.010 ÷ 13.030
	Oversizing 0.20
Valve guide I.D. (bore) "b"	7.022 ÷ 7.040
Interference between valve guides and their seats	0.033 ÷ 0.080

Valve seats

Unit: mm

Valve seat O.D. "a"	Intake	35.135 ÷ 35.150
	Exhaust	29.142 ÷ 29.157
Taper of band in contact with valve "α"		90° ± 10'
Interference between valve seats and the housings	Intake	0.091 ÷ 0.131
	Exhaust	0.100 ÷ 0.136
Cylinder head heating temperature to assemble valve seats		80 °C

Valves

Unit: mm

Valve stem diameter "a"	Intake	6.975 ÷ 6.990
	Discharge	6.960 ÷ 6.975
Valve head diameter "b"	Intake	33.4 ÷ 33.7
	Discharge	27.9 ÷ 28.2
Radial clearance between valve stems and valve guides	Intake	0.032 ÷ 0.065
	Exhaust	0.047 ÷ 0.080

Valve springs

	External spring	Internal spring
Free length "L1"	46 mm	39 mm
Closed valve length "L2"	34 mm	29.5 mm
Load corresponding to "L2"	271 ÷ 294 N (27.6 ÷ 30 kg)	96 ÷ 106 N (9.8 ÷ 10.8 kg)
Open valve length "L3"	24.5 mm	20 mm
Load corresponding to "L3"	485 ÷ 524 N (49.4 ÷ 53.4 kg)	201 ÷ 221 N (20.5 ÷ 22.5 kg)

Hydraulic tappets

Unit: mm

Hydraulic tappet O.D. "a"	32.959 ÷ 32.975
Radial clearance between hydraulic tappets and their seats	0.025 ÷ 0.066

02 Maintenance