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Anodes (“sacrificial” anodes)
Sacrificial anodes are attached to the bottom of the gimbal hous-
ing and at the front of the gearcase above the anti-ventilation
plate. (On the DPX drive only, there are additional anodes at
the back of the intermediate housing, and on the steering cylin-
ders.)
Anodes are slowly eroded away by galvanic action and require
inspection. Additionally, anodes that are subjected to frequent
wetting and drying require periodic scraping with coarse emery
cloth or sandpaper to remove scale and oxidation to maintain
their effectiveness.
Do not paint anodes, as this will destroy
their effectiveness.
When you need to purchase new anodes, see your Volvo
Pen-
ta dealer. The material composition of Volvo Penta anodes
meets U.S. Military Specification 18001-H. If you use other an-
odes, make sure they have equivalent specifications or galvan-
ic corrosion protection will be lost.
You may order the anodes separately, or as part of an acces-
sories kit. (The accessories kit also includes o-rings, oils,
washers, seals, and bellows.)
Replacing sacrificial anodes
1.
Inspect anodes every 14 days, or more frequently if used
in extremely salty water. If an anode is 2/3 its original size
(1/3 eroded), replace it.
NOTE! If you use a stainless steel propeller, additional
sacrificial anodes may be required to handle
the added corrosion potential.
2.
Remove the two screws holding the anodes onto the
gearcase and/or the gimbal housing. Set the screws aside,
as you will use them again.
3.
Pull off the old anode.
4.
Insert the new anode.
5.
Secure with two screws.
6.
Tighten screws to these torque specifications:
— 12 – 14 ft. lb. (16 – 19 N·m) for the gimbal housing
anode
— 60 – 84 in. lb. (6.8 – 9.5 N·m) for the gearcase anode
If additional electronic or electrical equipment is installed, each
item should have an individual anode or grounding device and
all grounding devices must be interconnected. Follow equip-
ment manufacturers recommendations.
NOTE! When your boating is done mostly in fresh wa-
ter, Volvo Penta recommends replacing zinc
anodes with magnesium anodes.
Maintenance
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