Maintenance Sacrificial Anodes Sacrificial anodes are attached to the bottom of the gimbal housing and at the front of the gearcase above the anti- ventilation plate. 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 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 Penta dealer. The material composition of Volvo Penta anodes meets U.S. Military Specification 18001-H.
Some after-market anodes may not meet mil-specs and are larger in size. Using after-market sterndrive anodes may cause cavitation bubbles due to poor fit, which may lead to propeller erosion. You may order the anodes separately, or as part of an accessories 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, addi- tional sacrificial anodes may be required to handle the added corrosion potential.
7743722 - Downloaded from www.volvopenta.com 13/05/2008 20:17:06 2. Remove the two screws holding the anodes onto the gearcase and/or the gimbal housing. Set the screws aside; you will use them again. 22861-3 3. Pull off the old anode. 4. Insert new anode and secure with two screws. 5. Tighten screws to these torque specifications: 12–14 ft. lb. (16 – 19 Nm) for the gimbal housing anode. 60–84 in. lb. (6.8 – 9.5 Nm) for the gearcase anode. If additional electronic or electrical equipment is in- stalled, each item should have an individual anode or grounding device and all grounding devices must be interconnected. Follow equipment manufacturers rec- ommendations. 22861-2 NOTE!
Your Volvo Penta product has been shipped with Aluminum anodes. Aluminum is effec- tive in both saltwater and in fresh water. If you will be boating in saltwater exclusively, we recommend switching the anodes to Zinc. If you will be boating in fresh water ex- clusively, we recommend switching the an- odes to Magnesium. Replacing Heat Exchanger Anodes Engines with closed cooling systems have anodes lo- cated at the top of the heat exchanger. This anode re- sembles a bolt and may be removed and replaced using a 3/4 inch (19mm) wrench. When installing, tighten the anode all the way by hand, then turn an ad- ditional quarter turn using a wrench. 19511-1 94 VPA 7743722 English 10-2004