BF15D-BF20D
3)
Remove the five
5
x
10 mm screws and left engine under
cover.
4) Remove the spark plug caps, then remove the spark
5)
Visually inspect the spark plug. Discard the plug if the
6) Remove carbon or other deposits with a stiff wire brush.
7)
Measure the plug gap with a wire-type feeler gauge. If
necessary, adjust the gap by bending the side electrode.
plugs using a spark plug wrench.
insulator is cracked or chipped.
CR5EH-9
(NGK)
Standard spark plug
U16FER9 (DENSO)
1
Spark plug gap
1
0.8
-
0.9 mm (0.031
-
0.036
in)
1
8) Make sure the sealing washers are in good condition;
replace if necessary.
9) Install the plug fingertight
to
seat the washer, then tighten
with a plug wrench
to
compress the sealing washer.
If
reinstalling the used spark plug, tighten 1/8
-
1/4 turn
after the spark plug seats.
If installing a new spark plug, tighten
1/2
turn after the
spark plug seats.
The spark plugs must be securely tightened. An
improperly tightened spark plug can become very hot
and may damage the engine.
Overtightening the spark plug can damage the threads
in the cylinder head.
-1
cw-
UNDER COVER
I
11
1
SPARK PLUG WRENCH
0.8
-
0.9
mm
(0.031
-
0.036
in)
/
[l]
SIDE ELECTRODE
10)Reinstall the spark plug caps and then install the
removed parts in the reverse order of removal.
3=7
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