Evinrude B4R4 Operator's Manual page 43

Replacing the spark plugs
WARNING
!
● Do not reuse spark plug with
damaged insulation, or sparks
can leak through crack, potentially
leading to electric shock, explosion
and/or fire.
● Do not touch spark plugs
immediately after stopping engine
as they will be hot and could cause
severe burns if touched. Allow
motor to cool down first.
If the spark plug(s) is fouled, has
carbon build up, or is worn, it should
be replaced.
When reusing spark plugs, remove
dirt from the electrodes and adjust
spark gap to specification.
Notes
When inspecting the plug, always
clean the gasket surface and use a
new gasket. Wipe off any dirt from the
threads and screw in the spark plug
to the correct torque.
① Stop the engine.
② Remove the top cowl.
③ Remove the spark plug caps.
④ Remove the spark plugs by turning
it counter-clockwise, using a 5/8"
socket wrench and handle.
Use spark plug NGK DCPR-6E.
Electrode
Spark gap
(0.8 to 0.9 mm, 0.031 to 0.035 in)
INSPECTION AND MAINTENANCE
⑤ Attach spark plug and tighten to
specified torque.
Notes
◎ Spark plug torque :
18.0Nm(13.3ft-lb)(1.84kgf-m)
If a torque-wrench is not available
when you are fitting a spark plug, a
good estimate of the correct torque
is 1/4 to 1/2 a turn past finger-tight.
Have the spark plug adjusted to the
correct torque as soon as possible
with a torque-wrench.
Replacing the anode
A sacrificial anode protects the
outboard from galvanic corrosion.
Anode is located on the gear case
and the cylinder. When the anode is
eroded more than 2/3, replace it.
Notes
● Never grease or paint the anode.
● At each inspection re-tighten the
anode attaching bolt. As it is likely
to be subjected to electrolytic
corrosion.
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