Crankshaft

Make

Alfa Romeo

Model

155 Factory Service Manual

Year

1992–1998

Section

Crankshaft › Crankshaft

Engine – mechanical (Twin Spark)Crankshaft

Crankshaft

(1) Ovalization X:Y

(2) Taper A:B

	A - Red	59.970 ÷ 59.976
Diameter of main supports (a)	B - Blue	59.963 ÷ 59.970
	C - Yellow	59.956 ÷ 59.963
Diameter of rod journal (b)	A - Red	49.992 ÷ 49.998
	B - Blue	49.985 ÷ 49.992
	C - Yellow	49.978 ÷ 49.985
Lenght of central main journal (c)	30.000 ÷ 30.035
Maximum ovalization of main and rod journal (1)	0.007
Maximum taper of main and rod journals (2)	0.010
Maximum error of parallelism between main and rod journals	0.015
Maximum eccentricity between main journals	0.040
Maximum deviation between centre lines of handle and main journals	0.300

Main half bearings

	A - Red	1.830 ÷ 1.835
Thickness of main half bearings (a)	B - Blue	1.835 ÷ 1.839
	C - Yellow	1.839 ÷ 1.844
Radial play between main pin and bearing	A - Red	0.006 ÷ 0.034
	B - Blue	0.004 ÷ 0.031
	C - Yellow	0.001 ÷ 0.030

Thrust half rings

Thickness of thrust half rings (a)	2.311 ÷ 2.362
Crankshaft axial play	0.076 ÷ 0.263

03 Engine