Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 145/146 Engines, 146 Bodywork and Engine Overhaul Manual (1994-2001)12 · Engine overhaul: 3.0 V6 (AR16101)
12 · Engine

Removing the alternator (page 2 of 2)

Make
Alfa Romeo
Model
145/146 Engines, 146 Bodywork and Engine Overhaul Manual
Year
1994–2001
Section
Overhauling
Engine overhaul: 3.0 V6 (AR16101)Removing the alternator · page 2 of 2

NOTE: If squaring is not perfect, replace the connecting rod to avoid improper stress during engine operation with consequent irregular piston and connecting rod wear.

  1. Check connecting rod squaring with a reference as shown in the figure.
Connecting rod squaring check
  1. Measure the connecting rod journal diameter and check whether it falls within the prescribed values.
Connecting rod journal diameter measurement
Connecting rod journal diameter Class A (Red) Class B (Blue)
51.980 ÷ 51.990 mm 51.990 ÷ 52.000 mm
  1. Check the difference in weight between connecting rods with half-bearings, caps and screws. Check whether the value falls within prescriptions.
Connecting rod weight difference check
Connecting rod weight difference ± 4 g
  1. Fit the connecting rod half-bearings in the connecting rod big end and on the respective cap. Then assemble, fastening the screws at the prescribed torque.
Connecting rod half-bearing assembly

53 ÷ 59 Nm
5.4 ÷ 6.0 kgm

  1. Measure the connecting rod big end internal diameter and check whether it falls within the prescribed values.
Connecting rod half-bearing internal diameter measurement
Connecting rod half-bearing internal diameter Class A (Red) Class B (Blue)
52.021 ÷ 52.050 mm 52.013 ÷ 52.042 mm
  • Calculate the play between connecting rod journals and respective half-bearings. Check whether the value falls within prescriptions.
Connecting rod journal and half-bearing play check
Connecting rod journals and respective half-bearing diameter Class A (Red) Class B (Blue)
0.021 ÷ 0.060 mm 0.023 ÷ 0.062 mm

NOTE: The crankshaft nitriding treatment does not allow re-facing. Consequently, it should be replaced if excessively worn.

  • Calculate the play between pins and respective piston seats. Check whether the value falls within prescriptions.
Play between pins and piston seats
Play between pins and piston seats 0.006 ÷ 0.012 mm

Play between connecting rod journal and respective half-bearings

Parts & tools for this job For 1994 Alfa Romeo 145/146

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