Subaru Legacy 2002 Service Manual page 483

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3) Oil fouled

Wet black deposits show excessive oil entrance

into combustion chamber through worn rings and

pistons or excessive clearance between valve

guides and stems. If same condition remains after

repair, use a hotter plug.

4) Overheating

White or light gray insulator with black or gray

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. It is advisable to replace with plugs having

colder heat range.

Clean spark plugs in a sand blast type cleaner.

Avoid excessive blasting. Clean and remove car-

bon or oxide deposits, but do not wear away por-

If deposits are too stubborn, replace plugs.

E: ADJUSTMENT

Correct it if the spark plug gap is measured with a

gap gauge, and it is necessary.

Spark plug gap: L

1.0 — 1.1 mm (0.039 — 0.043 in)

Replace with new spark plug if this area (A) is worn

to "ball" shape.

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