English 5.906-565.0 Rev. 00 (12/12) 19 Push the sealing ring onto the installation mandrel(special tool). Place the installation sleeve on the cylinder head. Push the sealing ring through the installationsleeve (special tool) into the cylinder head usingthe installation mandrel. Lightly grease the sealing ring inside (grease6.288-079.0). Place the disc inside the brass disc. Insert both discs of the high pressure gasket pack-age in the cylinder head together. Centre the cylinder head on the pistons and pushit up to the crankshaft casing in one go.Note:If the cylinder head is pulled back during installation(e.g. because it was jammed during installation),there is a risk that the gasket packages depacketizeand are no longer seated correctly when pushed to-gether again. Screw in the cylinder head studs and tighten themcrosswise (torque 20...25 Nm).7.8.3 Installing the cylinder head