Spark Plug Thread, Recondition
Remove, Disconnect
Remove cylinder head - see operation "Cylinder Head, Remove and Install".
Ream and recut thread - use spark plug tap (observe manufacturer's instructions).
Install, Connect
Bolt thread insert onto spark plug - dimension (1) = 17 mm/0.7 in.
Install spark plug with thread insert in cylinder head - 25 Nm/18 lbf. ft.
Install cylinder head - see operation "Cylinder Head, Remove and Install".
Remove, Disconnect 
Install, Connect 