Main half bearings

Make

Alfa Romeo

Model

145/146 Factory Service Manual

Year

1994–1999

Section

Engine › Main half bearings

Technical data and maintenanceMain half bearings

Main half bearings

Unit: mm		AR 33501	AR 33201
Thickness of main half bearings "a"	Class A - Red	1.833 ÷ 1.839	1.832 ÷ 1.838
	Class B - Blue		1.836 ÷ 1.842
Operating clearance between main journals and half bearings		0.028 ÷ 0.063	0.023 ÷ 0.057

Half thrust rings

	Thickness of half thrust rings "a"	2.310 ÷ 2.360
Crankshaft end float	0.060 ÷ 0.250

Engine flywheel

	Flywheel grinding dimension "b" (1)	≥ 21.15 mm
Maximum error of parallelism between driven plate rest surface and flywheel rest surface at crankshaft (measured on a radius of 100 mm)	0.08 mm
Maximum error of flatness of driven plate resting surface	0.02 mm
Roughness of driven plate rest surface	2 μm
Heating temperature of ring gears for assembly on engine flywheel	120° ÷ 140°C

(1) The removal of material must be the same on both the driven plate rest surface and on the clutch cover rest surface.

CONNECTING ROD PISTON ASSEMBLY

Connecting rod

	Small end bushing bore "a"	21.007 ÷ 21.015
Inside diameter of rod big end "b"	53.696 ÷ 53.708
Clearance between small end bushing and pin	0.007 ÷ 0.019

Connecting rod half bearings

Unit: mm
Thickness of rod half bearings "a"	Class A - Red	1.826 ÷ 1.832
	Class B - Blue	1.830 ÷ 1.836
Operating clearance between rod pins and their half bearings		0.032 ÷ 0.064

02 Maintenance