Valve seats

Make

Alfa Romeo

Model

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

Year

1995–2000

Section

Technical Features › Valve seats

Variants – 3.0 V6 24VValve seats

Valve seats

Unit: mm

Outside diameter of valve seats "a"	Intake	36.600 ÷ 36.616
	Oversize 0.3
	Exhaust	32.100 ÷ 32.116
	Oversize 0.3
Valve seat taper "α"		90° ± 20'
Interference between valve seats and their seats	Intake	0.075 ÷ 0.116
	Exhaust	0.075 ÷ 0.110
Heating temperature of cylinder heads for fitting valve seats		100 ÷ 120 °C

Valves

Unit: mm

Diameter of valve stems "a"		6.965 ÷ 6.980
Diameter of valve mushrooms "b"	Intake	35.5 ÷ 35.7
	Exhaust	31.0 ÷ 31.2
Radial clearance between valve stems and valve guides		0.020 ÷ 0.050

Valve springs

	Outer spring	Inner spring
Free length "L1"	~ 45 mm	~ 42 mm
Length with valves closed "L2"	32.5 mm	30.5 mm
Corresponding load at "L2"	219.1 ÷ 230.9 N (22.4 ÷ 23.6 kg)	123.6 ÷ 131.4 N (12.6 ÷ 13.4 kg)
Length with valves open "L3"	23 mm	21 mm
Corresponding load at "L3"	430.7 ÷ 450.3 N (43.9 ÷ 45.9 kg)	240.2 ÷ 259.8 N (24.5 ÷ 26.5 kg)

Hydraulic tappets

Unit: mm

Outside diameter of hydraulic tappets "a"	32.959 ÷ 32.975
Radial clearance between hydraulic tappets and their seats	0.025 ÷ 0.066

Camshafts

Unit: mm

Diameter of camshaft journals "a"		26.959 ÷ 26.980
Length of camshaft shoulder "b"		20.000 ÷ 20.033
Nominal cam lift	Intake	9.30
	Exhaust	9.30
Maximum eccentricity between journals		0.03
Clearance between camshaft journals and their seats		0.030 ÷ 0.077
Camshaft end float		0.065 ÷ 0.131

12 General