−
−
With the plug washer attached, thread
the spark plug in by hand to prevent
cross-threading.
Make sure the plug washer is in good
condition.
Inspect the electrodes and center
porcelain for deposits, erosion or carbon
fouling. If the erosion or deposit is heavy,
replace the plug. Clean a carbon or wet-
fouled plug with a plug cleaner, otherwise
use a wire brush.
Check the spark plug gap (
) using a
wire-type feeler gauge. If adjustment is
necessary, bend the side electrode (
)
carefully.
The gap should be:
If installing a new plug, tighten it twice
to prevent loosening:
First, tighten the plug:
NGK:
turn after it seats.
DENSO:
turn after it seats.
Then loosen the plug.
Next, tighten the plug again:
1/8 turn after it seats.
If the old plug is good:
1/8 turn after it seats.
Tighten each spark plug:
Improperly tightened spark plugs can
damage the engine. If a plug is too loose, a
piston may be damaged. If a plug is too tight,
the threads may be damaged.
Reinstall the spark plug caps. Take care
to avoid pinching any cables or wires.
6.
8.
7.
4.
5.
3.
a)
b)
c)
3/4
1/2
2
3
(2)
(3)
(2) Spark plug gap
(3) Side electrode
69
0.8
0.9 mm (0.03
0.04 in)
10/03/11 17:13:46 32KRHA00_079
