Tighten diagonally in three stages with a torque wrench (18-22 N-m) Coolant must be in HOAT formulation (OAT type forbidden) 20-minute airtightness test at first start-up "Characteristics: - Shaft core hard chrome plated, hardness up to HV850 - Equipped with Woven Carbon gaskets, pressure resistant Adapted OE no. 52088401AB