Subaru 2003 Legacy Service Manual page 69

SPARK PLUGS
PERIODIC MAINTENANCE SERVICES
9) Tighten ignition coil.
Tightening torque:
16 N·m (1.6 kgf-m, 11.7 ft-lb)
NOTE:
• Be sure to place the gasket between the cylinder
head and spark plug.
• If torque wrench is not available, tighten spark
plug until gasket contacts cylinder head: then tight-
en further 1/4 to 1/2 turn.
PM-11