Removing
Remove radiator.
Remove fan clutch.
Remove the alternator belt and unscrew the crankshaft pulley.
Unscrew the plug screw for the pressure reducing valve.
Loosen the cap screw (see arrow) for the oil passage with an 8 mm Allen key and remove it. To do this, lubricate the key so that the bolt remains hanging on it.
Using a lever, remove the sealing ring from the countersinking of the oil channel. In this case, the sealing ring cannot fall until a long wire is inserted into the oil channel.
Installation
Screw on the pressure reducing valve and tighten to 40 Nm.
Coat the threads of the blind bolt with sealing compound and tighten the bolt to 50 Nm. Tighten pulley bolt to 35 Nm.
Install the cooling fan clutch, put on the belt and tension it.
Install the radiator.
Fill with coolant.
Start the engine, check the oil pressure and the tightness of the plug bolt.