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Valve seat rings, replace (X 15 DT, X 17 DT)
Special service tools required:
Welding equipment, remover, installer drift, assembly device
KM-6215-1, storage facility KM-849
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Note: All attaching
parts such as camshaft(s) and hydraulic valve lifters are removed.
Cylinder head is attached to assembly device KM-6215-1. All valves
are removed and placed on KM-849 in sequence of installation.
 Remove
Insert one nut at the inner valve seat ring and weld. Allow
valve seat rings to cool. Metal plates must be laid on the cylinder
head to avoid it being damage. The metal plates serve as a
supporting point for the remover. Place the remover on the metal
plates and carefully pull out the valve seat rings.
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Install
Place the installer drift on the valve seat ring and carefully
press in the valve seat ring until stop.
Procedure
After pressing in the valve seat rings, these must be cut. See
operation "Valve seat, cut (in cylinder head)". 
Install
Install all valves in accordance with the sequence of removal.
See operation "Cylinder head, assemble".
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