Crankshaft

Make

Alfa Romeo

Model

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

Year

1995–2000

Section

Engine technical data (T. Spark 16V) › Crankshaft

00 Technical data and maintenanceCrankshaft

Crankshaft

Unit: mm

Diameter of main bearing journals "a"	Class A - Red	52.994 ÷ 53.000
	Class B - Blue	52.988 ÷ 52.994
	Class C - Yellow	52.982 ÷ 52.988
	Undersize 0.127
Diameter of connecting rod pins "b"	Class A - Red	50.799 ÷ 50.805
	Class B - Blue	50.793 ÷ 50.799
	Class C - Yellow	50.787 ÷ 50.793
	Undersize 0.127
Length of centre bearing journal "c"		26.575 ÷ 26.625
Maximum taper of main and connecting rod journals		0.0045
Maximum error of concentricity between main journals and connecting rod journals		0.003

Main half bearings

Unit: mm

Thickness of main half bearings "a"	Class A - Red	1.836 ÷ 1.840
	Class B - Blue	1.839 ÷ 1.843
	Class C - Yellow	1.842 ÷ 1.846
	Undersize 0.127
Operating clearance between main journals and half bearings		0.025 ÷ 0.052

Counter-rotating shafts

Unit: mm

Diameter of counter-rotating shaft pins	Front "a"	19.980 ÷ 19.993
	Centre "b"	36.945 ÷ 36.960
	Rear "c"	19.990 ÷ 20.010
Diameter of centre bushes	Inside "d"	37.020 ÷ 37.040
	Outside "e"	40.065 ÷ 40.090
Diameter of ball bearings	Inside "f"	19.990 ÷ 20.000
	Outside "g"	46.989 ÷ 47.000
Interference between centre bushes and their seats on crankcase		0.056 ÷ 0.111
Radial clearance between bushes and centre journals		0.060 ÷ 0.095
Clearance / Interference between ball bearings and their seats on crankcase		+0.011 ÷ -0.025
Clearance / Interference between ball bearings and counter-rotating shaft pins	Front	+0.020 ÷ -0.003
	Rear	+ 0.010 ÷ -0.020

02 Maintenance