Honda Civic Coupe 1999 Owner's Manual page 187

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Spark Plugs
5. Torque the spark plug. (If you do
not have a torque wrench, tighten
the spark plug two-thirds of a turn
after it contacts the cylinder head.)
Tightening torque:
13 lbf.ft (18 N.m, 1.8 kgf.m)
Maintenance
NOTICE
Tighten the spark plugs carefully. A
spark plug that is too loose can
overheat and damage the engine.
Overtightening can cause damage to
the threads in the cylinder head.
6. Install the spark plug cap.
7. Repeat this procedure for the
other three spark plugs.
Specifications:
(U.S.: HX)
NGK:
ZFR4F-11
DENSO:
KJ14CR-L11
(U.S.: DX, EX, Canada: DX, Si)
NGK:
ZFR5F-11
DENSO:
KJ16CR-L11
(U.S.: Si, Canada: SiR)
NGK:
PFR6L-13
DENSO:
PK20PR-L13
Spark Plug Gap:
0.04 in (1.1 mm)

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