Thrust half rings

Make

Alfa Romeo

Model

145/146 Factory Service Manual

Year

1994–1999

Section

Engine › Thrust half rings

Technical data and maintenanceThrust half rings

Thrust half rings

Thickness of thrust half rings "a"	2.347 ÷ 2.363
End play of the driving shaft	0.049 ÷ 0.211

Flywheel

Heating temperature of crown gear for the fitting of engine flywheel

80°C

Oil pump

Clearance between pump seat and driven gear "a"	0.080 ÷ 0.186 mm
Clearance between face of pump cover and gears "b"	0.025 ÷ 0.056 mm
Spring of pressure relief valve	Length	36 mm
Check load	74 ÷ 82.9 N
Engine oil pressure (with engine oil at 100°C)	3.43 ÷ 4.0 bar

CONNECTING ROD - PISTON GROUP

Connecting rods

Diameter of small end "a"	27.939 ÷ 27.972
External diameter of small end bushings "b"	28.020 ÷ 28.060
Internal diameter of small end bushings (line-boring) "c"	Version before mod.	Class 1	26.004 ÷ 26.007
Class 2	26.007 ÷ 26.010
Version after mod.	26.004 ÷ 26.009
Diameter of connecting rod heads "d"	53.897 ÷ 53.913
Weight difference between connecting rods	± 2.5 g
Play among bushings, small ends and piston pins	Version before mod.	0.014 ÷ 0.020
Version after mod.	0.013 ÷ 0.022
Interference among bushings, small ends and bushings' seats	0.048 ÷ 0.121

Half bearings

Thickness of half bearings "a"	Class A (Red)	1.527 ÷ 1.533
Class B (Blue)	1.533 ÷ 1.539
Undersize by 0.127
Radial play between pins and bearings	Class A (Red)	0.026 ÷ 0.063
Class B (Blue)	0.023 ÷ 0.060

02 Maintenance