expansion compensating system for fixing dovetail

Fixing device (10) of a manifold (11) of the exhaust gas against a cylinder wall (14) of the engine, said collector being extended by a flange (20) end comprising a lower strap (24) fixed integral with the cylinder head and an upper strap (23) diametrically opposite comprising a contact surface (29), characterized in that the device comprises a fastening web (30) having a fixing plate (31) against the cylinder head and support plate (32) on the upper web portion having a shape complementary to the contact surface (29) of the upper web portion and having a deformable elastic portion.