Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 155 Factory Service Manual (1992-1998)03 · Engine – mechanical (Twin Spark)
03 · Engine

Main bearing caps

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
Engine block checks and inspections › Main bearing caps
Engine – mechanical (Twin Spark)Main bearing caps
  • Visibly check the engine block for signs of cracking and excessive wear of the sliding surfaces: check that the threads are all intact.
  • Remove the caps from the main engine lubrication and coolant channel and clean with a suitable detergent. Blow off with compressed air and install new caps.
  • Thoroughly clean the engine block faces of all traces of old gasket.
Engine block diagram showing main bearing caps and support structure

MAIN BEARING CAPS

  1. Install the main bearing caps in the position and direction identified by the numbering on the caps themselves.
  2. Tighten the lubricated nuts to the correct torque and check that the diameter of the main supports is within the prescribed limits.
  3. Check that the length "S" of the central main support shoulder is within the prescribed limits.

Length of central main support shoulder "S"

25.15 to 25.20 mm
Diagram showing torque application and measurement of central main support shoulder

20 Nm + 115°
2.04 kgm + 115°

Diameter of main supports
63.652 to 63.664 mm

Parts & tools for this job For 1992 Alfa Romeo 155

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