a sheath around each sparking plug draws off any gas leaks outside the heating air circuit; the joint between the cylinder head and the exhaust manifold is situated outside the heating air circuit; there is double leak protection between the cylinder head and the cylinder and any leaks from the first joint are drawn off outside the heating air circuit, or the leak protection between the cylinder head and the cylinder still holds when the cylinder head nuts are cold-tightened at one-third of the nominal torque prescribed by the manufacturer, or the area where the cylinder head is joined to the cylinder is situated outside the heating air circuit.
Une gaine autour de chaque bougie d'allumage évacue les fuites éventuelles à l'extérieur du circuit de l'air de chauffage; Le joint entre la culasse et la tubulure d'échappement est situé hors du circuit de l'air de chauffage; Une double étanchéité existe entre la culasse et les cylindres, avec évacuation des fuites éventuelles en provenance du premier joint hors du circuit de l'air de chauffage,