Fitting cylinder head

1. Use USAG wrench diam. 10 233 1/2 S or similar to unscrew bolts securing cylinder head to engine block. Then remove the cylinder head and the underlying gasket.

Fitting cylinder head

2. Fit the gasket on the engine block with the wording "ALTO" [TOP] facing the operator. Take care not to contaminate or lubricate the gasket and engine block surface. The arrowed holes increase in diameter from cylinders 1-4 in order to distribute coolant evenly over the engine block.

A = exhaust end
B = intake end

The cylinder head gasket is ASTADUR type. This type of gasket is made from a special material which undergoes a process of polymerisation while the engine is running and therefore hardens considerably during use.

The following conditions must be satisfied in order to ensure polymerisation occurs:

• - keep the gasket sealed in its plastic bag;
• - take out only shortly before fitting;
• - do not oil the gasket or contaminate with oil. Ensure cylinder head and crankcase surfaces are thoroughly clean.

3-4. Then fit the cylinder head and tighten retaining screws to a torque of 2 daNm. Observe the tightening pattern shown in the figure.