Position guide plate -VAS 5161/32-1- on cylinder head and secure with knurled screws -VAS 5161/12-. Screw adapter -T40012- with O-ring into the corresponding threaded hole of the spark plug by hand. Connect the adapter through a conventional adapter to a compressed air source and apply constant pressure. Minimum pressure: 0.6 MPa (6 bar). Insert punch -VAS 5161/3A- into guide plate and tap on it with a plastic hammer to loosen the valve cotters.
Screw bracket -VAS 5161/6- with plug -VAS 5161/5- into guide plate. Insert mounting cartridge -VAS 5161/32-2- with sleeve -VAS 5161/32-3- into guide plate. Hook pressure lever -VAS 5161/2- onto adjustable stop and press assembly cartridge down. At the same time, turn the stem installed in the mounting cartridge clockwise until the fork located at its end enters the gaps between the crackers. Alternately turn the stem in one direction or the other - the crackers will be squeezed out of each other and fixed in the cartridge. Release the push lever. Remove mounting cartridge. Loosen the screws securing the guide plate and move it to the side. The compressed air supply hose remains connected to the adapter. Remove valve spring with poppet.
Remove valve stem seal with valve stem pliers, eg -VAS 6770-.
Carefully! Risk of damage when installing valve stem seals.
Put on the valve stem the plastic sleeve -A- supplied with the new valve stem seal -B-. Lightly coat the sealing lip of the oil seal with oil. Put the oil scraper cap on the plastic bushing. Carefully press valve stem seal onto valve guide using drift -3365-. Remove plastic bushing.
If the valve cotters have been removed from the mounting cartridge, they must first be inserted into the mounting tool. The larger diameter valve cotters should point upwards. Press the mounting cartridge on top of the valve mounting tool to capture the valve cotters. Insert spring and valve disc, valve spring installation position.
Reattach guide plate -VAS 5161/32-1- to cylinder head. Insert assembly cartridge -VAS 5161/32-2- with sleeve -VAS5161/32-3- into guide plate. Press the lever and, turning the stem of the mounting cartridge first in one direction, then in the other, insert the crackers into place. Release the pressure lever with the stem still extended. Repeat the operation for each valve.
Assembly
Installation in reverse order. Install spark plugs. Install the camshaft housing.