Disconnect all parts located on the cylinder head. Unscrew the four injectors from the head and place them in such a way that they are well protected from damage due to impact with each other. Unscrew the glow plugs.
Clamp the cylinder head, together with the clamp screwed to the exhaust manifold set screw, in a vice.
Remove the camshaft (see paragraph 17.8.1).
Fig. 394. Compressing the valve spring using a special puller
The standard valve removal and installation tool and the method for installing it are shown in Fig. 394. The heel of the tool must be on the inside of the valve spring seat, otherwise the spring cannot be compressed. Press the lever of the tool and compress the spring so that the valve stem halves can be removed. Another way to remove the valves is to use a piece of pipe that fits over the upper spring plate. Something must be placed under the valve plate on the other side to fix it. Give the pipe a short hammer blow so that the valve stem halves come out. They will remain inside the pipe. But do not tear the pipe away from the spring plate, so as not to lose half the valve stem.
The valve spring plates can also be compressed using two screwdrivers. In this case, place a rag in the combustion chamber of the cylinder head to prevent the valve from falling down.
Remove the valve stem halves and springs, then remove the valve.
Fig. 395. Removing the oil deflector caps
Remove the valve stem seals. To remove the valve stem seals, it is best to use a special tool (3047A), as shown in Fig. 395. The tool is similar to a plastic mallet with an adapter, which is placed under the valve stem stem seals. The valve stem seals can also be removed using an angle screwdriver. However, in this case, special care should be taken not to damage the surface of the tappet holes. Always install new valve stem seals.
Remove the lower plates of the disc spring from the holes.
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