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
| Thickness of main half bearings "a" | Class A - Red | 1.832 ÷ 1.838 | |
|---|---|---|---|
| Class B - Blue | 1.836 ÷ 1.842 |
Operating clearance between main journals and half bearings 0.023 ÷ 0.055
Half thrust rings
| Thickness of half thrust rings "a" | 2.310 ÷ 2.360 | |
|---|---|---|
| Crankshaft end float | 0.06 ÷ 0.25 |
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 rest surface 0.02 mm
Roughness of driven plate rest surface 2 μm
Heating temperature of ring gears for fitting on 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 rods
| Inside diameter of small end bushing "a" | 21.007 ÷ 21.015 | |
|---|---|---|
| Inside diameter rod big end "b" | 53.696 ÷ 53.708 |
Clearance between small end bushing and pin 0.007 ÷ 0.019
Connecting rod half bearings
| Thickness of connecting 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
Parts & tools for this job For 1994 Alfa Romeo 145/146
- PARTEngine gasket setSearch: Alfa Romeo 145/146 1994 engine gasket set
- TOOLTorque wrenchSearch: 3/8 inch torque wrench
- TOOLFeeler gauge setSearch: feeler gauge set
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