Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 155 Factory Service Manual (1992-1998)07 · Engine – mechanical (V6)
07 · Engine

Valve springs

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
Valves › Valve springs
Engine – mechanical (V6)Valve springs
  • Smear the stop limit surfaces of the valves and relevant seats with abrasive paste.
  • Lubricate the valve stem with engine oil.
  • Fix the lower surface of the valve head to the suction cup of a pneumatic lap.
  • Insert the valve into the relative guide and grind.
  • After grinding thoroughly clean both the valves and their seats.
Outer spring
Length of the spring mm Control loading N(kg)
Valve closed 32.5 243 to 252 (24.8 to 25.7)
Valve open 23.5 470 to 488 (47.9 to 49.7)
SIPAL AREXONS Carbosilicium for valves
Inner spring
Length of the spring mm Control loading N(kg)
Valve closed 30.5 126 to 130 (12.8 to 13.3)
Valve open 21.5 222 to 231 (22.7 to 23.5)
Valve spring testing machine with dynamometer

VALVE SPRINGS

  • Check that the length of the "free" springs is within the prescribed limits.
  • The terminal planes must be parallel to each other and perpendicular to the spring axis (maximum allowable margin of error = 2°).
  1. Using a dynamometer check that the characteristic data of the springs are within the prescribed limits.
Length of free springs
outer spring La 44.6 mm
inner spring Lb 44.1 mm

Parts & tools for this job For 1992 Alfa Romeo 155

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