PERIODIC MAINTENANCE
30 SD60 Operation Manual
Corrosion Protection
The SD60 is equipped with a replaceable sacrificial anode on the lower leg of the drive.
This anode is designed to dissolve in response to electrical current generated while in sea
water.
This anode is not designed to accommodate other hardware or other excessive
electrical currents related to additional components or changes to the electrical AC
and DC systems on board the vessel.
This replaceable sacrificial anode capacity is for the drive only.
When a non-Aluminium propeller is installed, the non-Aluminium propeller must
have a additional replaceable sacrificial anode.
The SD60 will be mechanically connected to the powering engine. The design of the
electrical system of the engine will impact the selection of a proper galvanic protection
system.
■ Isolated systems
If the engine alternator and starting motor uses an isolated circuit (having both a battery +
and – connection terminal) then the system can be treated as an “isolated” system.
■ Non-Isolated systems
If either the starter motor or the alternator uses a single battery + and uses the body or
case as a ground through the engine, then the system of the SD60 and the engine must
be considered as “grounded” to the battery negative and not isolated.
■ Suggested actions
For information on this topic, review the published guidelines as contained in ABYC
guidebook, section E-2.
Upon final delivery of the vessel a review of the electrical bonding system should be
conducted. An expert in the field of electrical bonding should be called upon to review the
completed vessel. This review should determine if there is an appropriate amount or sizing
of sacrificial anodes installed in order to protect the mechanical components (engine and
SD60) from damage from galvanic corrosion.
Please keep in mind, changes made to the vessels AC and DC systems may impact
the protection of the installed anode system.
Damage to the SD60 as a result of failure to maintain a good balanced galvanic protection
system is not the responsibility of Yanmar.
SD60_OPM.book 30 ページ ２０１７年１２月８日 金曜日 午後３時６分
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