spark plugs replace SUBARU TRIBECA 2009 1.G Service Workshop Manual

IG(H6DO)-6
Spark Plug
IGNITION
2) Carbon fouled:
Dry fluffy carbon deposits on insulator and elec-
trode are mostly caused by slow speed driving in
the city, weak ignition, too rich fuel mixture and dirty
air cleaner.
3) Oil fouled:
Wet black deposits show oil entrance into the com-
bustion chamber through worn rings and pistons or
excessive clearance between valve guides and
stems.
4) Overheating:
White or light gray insulator with black or brown
spots and bluish burnt electrodes indicate engine
overheating. Moreover, the appearance results
from incorrect ignition timing, loose spark plugs,
wrong selection of fuel, hotter range plug, etc.
D: ADJUSTMENT
Clean the spark plugs using a wire brush. Clean
and remove the carbon or oxide deposits. But do
not wear away ceramic insulator at this time. If de-
posits are too stubborn, replace the spark plugs.
After cleaning the spark plugs, measure the spark
plug gap using a gap gauge.
NOTE:
Do not use a plug cleaner because the spark plugs
are applied with iridium tip.
Spark plug gap L:
0.7 — 0.8 mm (0.028 — 0.031 in)
IG-00012
IG-00013
IG-00014
IG-02035
L