Honda Civic 1998 Service Manual page 1195

Spark Plug Inspection
1. Inspect the electrodes and ceramic insulator for:
. lmproper gap
. Oil-fouling
. Carbon deposits
. Cracked center
electrode insulator
D a m a g e d
gasket
Burned or worn electrodes may be caused by:
. Advanced ignition timing
. Loose spark plug
. Plug heat range too low
. Insufficient cooling
Fouled plugs may be caused by:
. Retarded ignition timing
. Oil in combustion chamber
. lncorrect spark plug gap
. Plug heat range too high
. Excessive idling/low speed running
. clogged air cleaner element
.
Deteriorated ignition coil or ignition wires
worn or deformod
2.
Check the electrode gap.
! Adjust the gap with a suitable gapping tool.
Electrode Gap
S t a n d a r d
I t . t 8 m m ( 0 . 0 4 3 8 o o , i n )
'l.l mm
(0.043 in)
Replace the plug if the center electrode is rounded
as shown below:
3. Apply a small quantity of anti-seize compound to
the plug threads, and screw the plugs into the cylin-
der head finger-tight. Then torque them to 18 N m
(1.8 kgf.m, 13lbf.ft).
ROUNDED
ELECTRODE
I r----a
l l F q -
Engine Types
Spark Plugs
D 1 6 Y 5 Z F R 4 F . 1 1 { N G K )
K J l 4 C R - 1 1 1 ( D E N S O )
D16Y7,
D16Y8
Z F R 5 F - 1 1 ( N G K )
K J 1 6 C R - 1 1 1
( D E N S O )
23-97