2-6 PERIODIC MAINTENANCE
SPARK PLUG GAP
Measure the spark plug gap using a thickness gauge.
If out of specification, regap the spark plug.
% Spark plug gap: 0.6 – 0.7 mm
(0.024 – 0.028 in)
& 09900-20803: Thickness gauge
ELECTRODE’S CONDITION
Check the condition of the electrode.
If it is extremely worn or burnt, replace the spark plug.
Replace the spark plug if it has a broken insulator, damaged
threads, etc.
'
Check the thread size and reach when replacing the spark
plug. If the reach is too short, carbon will be deposited
on the screw portion of the spark plug hole and engine
damage may result.
SPARK PLUG INSTALLATION
'
To avoid damaging the cylinder head threads, first finger
tighten the spark plug and then tighten it to the proper
torque using the spark plug wrench.
• Insert the spark plugs to the cylinder heads by finger tight,
and then tighten them to the specified torque.
) Spark plug: 11 N
.
m (1.1 kgf
.
m, 8.0 lb-ft)
NOTE:
If it is difficult to remove any of the spark plug caps, pry them up
using a screwdriver.
& 09930-10121: Spark plug wrench set
09900-20803: Thickness gauge
Standard Cold type Hot type
NGK CR9EK CR10EK CR8EK
DENSO U27ETR U31ETR U24ETR
CARBON DEPOSITS
Check to see if there are carbon deposits on the spark plug.
If carbon is deposited, remove it using a spark plug cleaner ma-
chine or carefully use a tool with a pointed end.
0.6 – 0.7 mm
(0.024 – 0.028 in)
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