TOHATSU M 40D2 Owner's Manual page 69

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Do not hold propeller with hand(s)
when loosening or tightening propeller
nut. Put a piece of wood block
between propeller blade and anti-
ventilation plate to hold propeller.
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● Do not install propeller without
thrust holder, or propeller boss
could be damaged.
● Do not reuse split pin.
● After putting split pin, open the end
to prevent it from coming off which
could lead to coming off of propeller.
Replacing the spark plugs
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● 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.
Note
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.
If the spark plug(s) is fouled, has
carbon build up, or is worn, it should
be replaced.
INSPECTION AND MAINTENANCE
When reusing spark plugs, remove dirt
from the electrodes and adjust spark
gap to specification.
1 Remove the top cowl.
2 Remove the spark plugs by turning
counter-clockwise with the socket
wrench (21 mm: 13/16 in) fitted with
the handle. Tap lightly on the spark
plugs if they are hard to turn.
Use spark plug NGK B7HS-10 or
BR7HS-10 for M40D2 and B8HS-10 or
BR8HS-10 for M50D2.
Spark gap : 0.9 - 1.0mm
(0.035 - 0.039 in)
Notes
● Spark plug torque :
27.0Nm (20ft-lb) (2.7kgf-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.
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Do not touch the high tension cords
running from the ignition coil to
the spark plugs while the engine is
running or is turned by the electric
starter motor, not even for testing the
high tension cords or the spark plugs.
The high tension cords and the spark
plugs generate very high electric
voltage, which can cause a serious
electric shock if touched.
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