Spark Plugs - Subaru 2003 Legacy Service Manual

PERIODIC MAINTENANCE SERVICES

5. Spark Plugs

A: REPLACEMENT
1. 2.0 L NON-TURBO AND 2.5 L MODEL
1) Disconnect battery ground cable.
2) Remove intake duct and intake chamber.
3) Remove washer tank and put it aside.
4) Disconnect spark plug cord.
5) Remove spark plug with a plug-wrench.
6) Set new spark plug.
Recommended spark plug :
With OBD
CHAMPION RC10YC4
CHAMPION RC8YC4
NGK BKR6E-11
NIPPONDENSO K20PR-U11
Spark plug gap
1.0 — 1.1 mm (0.039 — 0.043 in)
Without OBD
NGK BKR6E (Without catalytic converter)
CHAMPION RC10YC4 (With catalytic con-
verter)
NGK BKR5E-11 (With catalytic converter)
Spark plug gap
0.7 — 0.8 mm (0.028 — 0.031 in) (Without
catalytic converter)
1.0 — 1.1 mm (0.039 — 0.043 in) (With cat-
alytic converter)
7) Tighten spark plug lightly with hand, and then
secure with a plug-wrench to the specified torque.
Tightening torque:
21 N·m (2.1 kgf-m, 15 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 turns.
SPARK PLUGS
2. 2.0 L TURBO AND 3.0 L MODEL
1) Disconnect battery cables and then remove bat-
tery and battery carrier.
2) Remove washer tank and put it aside.
3) Remove air cleaner lower case.
4) Disconnect connector from ignition coil.
5) Remove ignition coil.
• 3.0 L model
PM-00110 • Turbo model
6) Remove spark plug with a spark plug socket.
7) Set new spark plug.
Recommended spark plug:
• 3.0 L model
• Turbo model
8) Tighten spark plug lightly with hand, and then
secure with a plug-wrench to the specified torque.
Tightening torque:
PM-10
NGK PLFR 6A-11
NGK PFR 6G
21 N·m (2.1 kgf-m, 15 ft-lb)
PM-00111
PM-00145
PM-00112