Subaru Legacy 2004 Service Manual page 1283

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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.

If deposits are too stubborn, replace the plugs.

After cleaning the spark plugs, correct the spark

plug gap using a gap gauge.

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)

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

worn to "ball" shape.

IG(H4DOTC)-6

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