Spark Plug Service - Subaru EA190V Service Manual

3-5 Spark Plug Service

(1) Remove the spark plug cap. Clear away dirt around the
spark plug base;
(2) Use the plug wrench to remove the spark plug;
(3) Visually inspect the spark plug, if the insulator is
cracked, replace with new the spark plug, if deposit
around the electrode, remove carbon or other deposits
with a stiff wire brush;
(4) Measure the spark plug clearance with a feeler. The
clearance should be 0.6~0.7mm.If need adjusting,
lightly tap (for gap too big) or pry up with flat
screwdriver (for gap too small) electrode.
(5) Check the spark plug washer if it is in good condition.
(6) Install the spark plug on and screw down it with plug
wrench, compress the plug washer. Cover the spark
plug cap on.
NOTICE:
To avoid cross-threading, first, screw in spark plug by
hand, then tighten with a spark plug wrench to compress
the gasket.
If a new spark plug is used, more twist 1/2 turns after
compressing the gasket.
If reinstall the used spark plug, just more twist 1/8-1/4
turns.
Spark plug torque value: 22±2N·m
The spark plug must be tightened securely, or it may
become very hot to damage the engine.
When replaced, please pay attention to model of the spark plug to avoid damaging the engine or using
recommended spark plug or the equivalent. Incorrect heat range of the spark plug may damage the engine
·EA190 recommended spark plug model: NGK——BPR7HS
Plug wrench
CHAMPION——RL87YC
TORCH——E7RTC
12
Spark plug cap
0.60~0.70mm
Side electrode