Timing shafts

Make

Alfa Romeo

Model

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

Year

1995–2000

Section

Technical features (T. Spark 16V) › Timing shafts

00 Technical data and maintenanceTiming shafts

Timing shafts

Unit: mm

Diameter of t iming shaft pin "a"		26.000 ÷ 26.015
Diameter of phase variator pin "b"		49.985 ÷ 50.000
Cam nominal lift	Intake	9.50
	Exhaust	9.50
Clearance between timing shaft pins and relevant seats		0.03 ÷ 0.07
Timing shaft axial clearance		0.10 ÷ 0.23

Phase variator half-bearings

Unit: mm

Thickness of phase variator "a" half-bearings	2.992 ÷ 2.998
Clearance between phase variator and bearings	0.034 ÷ 0.086

TIMING ACTUAL DIAGRAM ANGLE
(Obtained with control clearance 0.45 mm)

Intake	Opening (before T.D.C.)	"a"	-3° 22° (*)
	Closing (after B.D.C.)	"b"	51° 26° (*)
	Intake angle value	"c"	228°
Exhaust	Opening (before B.D.C.)	"d"	47°
	Closing (after T.D.C.)	"e"	4°
	Exhaust angle value	"f"	231°

(*): Value obtained with phase variator on.

02 Maintenance