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

Checking valve leakage

Make
Alfa Romeo
Model
155 Factory Service Manual
Year
1992–1998
Section
Indications for reassembly › Checking valve leakage
Engine – mechanical (Twin Spark)Checking valve leakage · page 1 of 2

For the reassembly operations, follow the procedure used for disassembly in the reverse order unless otherwise indicated below.

CHECKING VALVE LEAKAGE

  • Insert the spark plugs in their seatings.
  1. Pour a small quantity of fuel in one of the combustion chambers so that it just covers the valve heads.
  2. Blow low pressure air into the intake and exhaust ports and check that no bubbles form. If there are bubbles check for correct assembly and grind the valve seats again if necessary (see specific procedure).
Engine block with spark plugs inserted and air hose connected to intake/exhaust ports

REASSEMBLING CAMSHAFTS, ADJUSTING VALVE CLEARANCE

Locking the nuts of the camshaft caps when the timing marks do not correspond means that the valves overlap and strike each other leading to irreparable damaged. It is therefore necessary to scrupulously follow the refitting procedure given below.

  1. Position the camshafts.
    • Position the caps and turn them in accordance with the numbering marked on them.
  2. Tighten the lubricated camshaft cap nuts on the intake side to the prescribed torque.
Camshaft assembly diagram showing numbered parts 1 through 7 and a torque specification box

20 ÷ 22 Nm
2.04 ÷ 2.24 kgm

Parts & tools for this job For 1992 Alfa Romeo 155

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