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The spark-plug torque is 20 Nm ( ~ 2. kgm). If a torque-wrench
is not available, you can obtain a good estimate of the correct
torque turning the spark-plug completely by hand and then
turning it with the spanner, a new spark-plug must be turned ~
90° and an old one 15° ÷ 20°.
Replace the spark-plug cap, checking that it is correctly fitted and then
replace the top cowling. Picture No. 58.
Sacrificial anode.
To protect the motor against electrochemical corrosion, due to the
presence in its structure of many different materials, a sacrificial anode
has been applied.
The anode will be subject to a strong corrosion, so you have to remove the
scales from the surfaces of the anode periodically.
Failure to clean it, will affect its effectiveness.
Do not paint the anode, for this would render it ineffective.
When the corrosion compromise its functionality, you have to replace it.
Picture No.59.
Replacement of the propeller.
The propeller is one of the components, which have a great influence upon
the performance of the motor. An unsuitable or damaged propeller can
cause serious damages to the motor besides reduce the performance.
For a careful choice of the propeller consult a SELVA MARINE
service point.
To replace the propeller do as follows:
- wait until the motor has cooled down and remove the top cowling;
- remove the spark-plug cap, to avoid an accidental start during
the operations of replacement of the propeller;
− place the gear-shift lever in the neutral position "N";
− protect your hands using strong gloves and insert a wooden lump
between the propeller blades and the anti-cavitation plate, to keep the
propeller still.
− remove the self stopping nut, the washer and the propeller;
− spread the propeller shaft with water-repellent grease;
− make sure, that the drive propeller pin is centred on the shaft;
− by hand insert the propeller making sure that it gets correctly into the
drive pin;
− insert the washer and by hand screw the self-locking nut;
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