Spark Plugs: Replacement

Disconnect battery ground cable.
Remove intake duct and intake chamber.
Remove washer tank and put it aside.
Disconnect spark plug cord.
Remove spark plug with a plug-wrench.

Fig 1: Removing Spark Plugs
Courtesy of SUBARU OF AMERICA, INC.
Set new spark plug.
Recommended spark plug:

Non-TURBO model;

CHAMPION RC10YC4

NGK BKR5E-11

NGK BKR6E-11

TURBO model;

NGK PFR6G

Spark plug gap

0.7 - 0.8 mm (0.028 - 0.031 in)
Tighten spark plug lightly with hand, and then secure with a plug-wrench to the specified torque.
Tightening torque:

24 N.m (2.4 kgf-m, 18 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 tighten further 1/4 to 1/2 turns.