Valve seats

Make

Alfa Romeo

Model

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

Year

1995–2000

Section

Connecting rod - piston assembly (V6) › Valve seats

00 Technical data and maintenanceValve seats

Valve seats

Unit: mm

Outside diameter of valve seats "a"	Intake	45.065 ÷ 45.100 45.365 ÷ 45.400 (1)
	Exhaust	39.095 ÷ 39.111 39.395 ÷ 39.411 (1)
Valve seat taper "α"		90° ± 20'
Interference between valve seats and their seats	Intake	0.040 ÷ 0.100
	Exhaust	0.070 ÷ 0.111
Heating temperature of cylinder heads for fitting valve seats		100 °C

(1) For Spares only

Valves

Unit: mm

Diameter of valve stems "a"	Intake	8.925 ÷ 8.960
	Exhaust	8.972 ÷ 8.987
Diameter of valve mushrooms "b"	Intake	43.82 ÷ 43.92
	Exhaust	38.52 ÷ 38.68
Radial clearance between valve stems and valve guides	Intake	0.040 ÷ 0.090
	Exhaust	0.013 ÷ 0.043

Valve springs

	Inner spring	Outer spring
Free length "L1"	44.6 mm	44.1 mm
Length with valves closed "L2"	32.5 mm	30.5 mm
Corresponding load at "L2"	243 ÷ 252 N (24.8 ÷ 25.7 kg)	126 ÷ 130 N (12.8 ÷ 13.3 kg)
Length with valves open "L3"	23.5 mm	21.5 mm
Corresponding load at "L3"	470 ÷ 488 N (47.9 ÷ 49.7 kg)	222 ÷ 231 N (22.7 ÷ 23.5 kg)

Camshafts

Unit: mm

Diameter of camshaft journals "a"		26.949 ÷ 26.970
Maximum eccentricity between journals		0.03
Width of camshaft shoulders "b"		27.000 ÷ 27.052
Nominal cam lift	Intake	10.4
	Exhaust	9
Clearance between camshaft journals and their seats		0.030 ÷ 0.084
Camshaft end float		0.060 ÷ 0.201

02 Maintenance