Measuring drive unit insulation
First
check that no connections have been made to the
drive unit, i.e. that the drive unit has not been con-
nected to the boat's protective system. If this is the
case, the connections must be removed. Connect
measuring wires to unpainted parts that are in good
contact with the drive unit and engine block. Set the
multimeter for DC current measurement. Note the
value.
Then connect a 9 V battery between the drive unit and
the engine block. Remove the battery after around 10
seconds. Read off the multimeter value. If the value is
high, >0.2 V, and then falls away quickly, the insulation
between the drive unit and engine block is sufficient.
Repeat the measurement for the other drive unit.
Arrangement and Planning, Electrochemical Corrosion
50 47704162 10-2014 © AB VOLVO PENTA
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