Workshop Manuals Factory service & repair Alfa Romeo
Alfa Romeo 145/146 Engines, 146 Bodywork and Engine Overhaul Manual (1994-2001)11 · Engine overhaul: 1.9 TD (AR67501)
11 · Engine

Cylinder head seal assembly

Make
Alfa Romeo
Model
145/146 Engines, 146 Bodywork and Engine Overhaul Manual
Year
1994–2001
Section
Overhauling › Cylinder head seal assembly
Engine overhaul: 1.9 TD (AR67501)Cylinder head seal assembly
  • Choose the cylinder head seal of suitable thickness according to the table given below.
F1 Average piston protrusion Thickness o cylinder head seal
up to engine no. 1762797 from engine no. 1762798 Thickness o cylinder head seal
< 0.7 mm < 1.05 mm 1.67 mm
0.7 ÷ 0.8 mm 1.05 ÷ 1.15 mm 1.75 mm (*)
0.8 ÷ 0.9 mm 1.15 ÷ 1.25 mm 1.85 mm (**)
> 0.9 mm > 1.25 mm 1.93 mm (***)

(*) marked by 1 notch on the outer edge

(**) marked by 2 notches on the outer edge

(***) marked by 3 notches on the outer edge

Cylinder head seal with notch markings

The cylinder head seal is of the ASTADUR type. Due to the special material with which it is made, this seal polymerises when the engine is running therefore it hardens considerably.

CYLINDER HEAD SEAL ASSEMBLY

For the cylinder head seal to polymerise, it is necessary:

  • to keep the seal in its original package;
  • take the wrapper off shortly before assembly;
  • not to lubricate or soil the seal with oil;
  • during assembly, carefully clean the surfaces of the cylinder and crankcase.
Assemble the cylinder head on the crankcase.
  1. Assemble the cylinder head on the crankcase.
  • Tighten the inner screws fastening the cylinder head as described below, bearing in mind that, for each step, the tightening sequence is the one shown below.
  • Tighten the inner screws to a torque of 100 Nm (10.2 kgm).
  • Angle tighten by 90° + 90° the inner screws using graduated disk no. 1.820.277.000.
Tighten the outer screws fastening the cylinder head to the crankcase.
  • Tighten the outer screws fastening the cylinder head to the crankcase to a torque of 26 ÷ 32 Nm (2.6 ÷ 3.2 kgm).

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

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