Replacing the Cylinder Head Gasket

Synchronising or timing an engine means ensuring that there is synchronisation between the positions of the valves (intake and exhaust) and those of the pistons, that is, between the crankshaft and the camshaft: for this reason, all manufacturers include references (arrows, notches, pin holes) that indicate the correct alignment between these elements.

Failure to synchronise would result in a collision between the valves and the pistons, causing severe engine damage.

The flatness of the surfaces of the cylinder head and the cylinder block is crucial to ensure that during normal engine operation, there are no interferences between pistons and valves (this is why different thicknesses of gaskets exist to compensate for any machining); it is always advisable to use a new set of bolts to secure the head and to follow a tightening sequence from the centre outwards; once the camshafts and the rocker cover are installed, align the timing references (use the appropriate tools to prevent movement of the shafts during the installation of the timing belt), install the pulleys and then the timing belt using a new kit that also includes the water pump and the tensioner.

Remove the tools and turn the crankshaft twice to complete a cycle and check the alignment of the timing references again.