Corrosione galvanica su VP D255 C

[kavokcinque]

A mio parere è importante fare la misurazione elettrica per l'isolamento dell' S drive, come descritto nel manuale di installazione dei motori Volvo Penta.

Galvanic corrosion
The S-drive is electrically isolated from the engine and
shall never be used as a grounding plane.
The S-drive has insulation (B) placed between the
adapter plate and the upper gear housing. An isolation
bush (A) shall be installed on one of the lower bolts.
IMPORTANT! The S-drive shall never be used
as a grounding plane or be electrically connected with any other equipment, i.e. radio, navigation equipment, rudder, bathing steps,

S-drive insulation
The 130S/SR and 150S/SR has an insulation located
in the drive. Between the adapter plate and the upper
housing is a insulating gasket © installed.
One of the lower two bolts (A) has an insolating
bushing (B) fitted. This bolt and bushing are secured
during transportation by a nut.
Electrical insulation between engine and flywheel
casing/power transmission.
IMPORTANT! The S-drive must on no account
be grounded. Grounding the S-drive may cause
serious damage due to galvanic corrosion.
Check insulation
Connect a measuring device to the bolt on the upper
housing and the grounding connection on the engine.
The result should be above 100 kW. If the measured
value is below 100kW the installation needs to be reviewed.