Maintenance Painting the Drive Paint Application SX and DP-S Drives 1. Treat any bare aluminum with chromate conver- sion coating. The SX and DP-S sterndrives and transom shield use a silicon-alloy aluminum casting process. The process requires a unique paint repair procedure. 2. Rinse thoroughly with water. The area must appear “wetted” or the surface is not clean and the paint will not adhere. Preparation 3. While the surface is still wet from rinsing, treat all bare aluminum with conversion solution. Brush the chromate solution on the surface. Add addi- tional solution as necessary for 2 to 5 minutes to prevent it from drying on the surface.
Rinse the surface thoroughly with water and allow to air dry. Follow the manufacturers instructions exactly. WARNING! Always follow the manufacturers instructions regarding personal protection when handling chemicals. You should always wear eye protection and gloves as a good work habit. 1. Remove all marine growth. 2. Use sandpaper or sandblast to remove loose paint and corrosion. Use a medium grit aluminum oxide sandpaper. If sandblasting use 55 - 25 grit (0.2 - 0.7mm) aluminum oxide blasting media. If the chromate is allowed to dry anywhere on the bare aluminum surface, chromic acid salts will form which will prevent paint adhesion and promote corrosion. Sand the surface to bare metal.
CAUTION! Do not use steel wool or emery cloth. Small pieces of steel or iron oxide used to produce steel wool and emery cloth will be- come embedded in the aluminum and cause severe corrosion. 7743722 - Downloaded from www.volvopenta.com 13/05/2008 20:17:06 Do not blow dry the part with compressed air unless it is completely free of dirt, oil and water. Do not heat the part above 140°F before paint- ing. 3. Wash with hot water and detergent to remove all traces of oil and grease. Do not touch the treated surface with bare hands before painting. 4. Roughen any painted areas that will be re-coated with a medium synthetic scouring pad or equiva- lent (i.e. 3M Scotchbrite™).
The part should be primed soon after it dries, or at least within 24 hours. 5. Rinse with water thoroughly and allow to air dry. Do not use a rag to wipe the area as some rags may have silicone. It is best to let the part air dry, but if you must wipe the surface to speed up drying, use a lint free wipe not treated with anything that may con- taminate the surface. Do not scrub the surface — wipe very lightly. 6. Clean the entire area with an acid cleaner that does not contain fluoride (i.e. DuPont® 5717). Scrub surface with a synthetic scouring pad until it is completely “wetted,” where no water beads on the surface.
Follow all local laws and regula- tions when using or disposing of any chemicals used in this process. 4. Where the primer coat is thin or where the sur- face is unpainted, prime with Volvo Penta primer P/N 11415627 or an equivalent epoxy primer (i.e. PPG® Super Koropon). Do not apply primer over a glossy hard finish coat without roughening. Primer solvents must be allowed to evaporate and the primer must harden before applying the finish coat. Follow the label instructions for method applications, drying times, and proper disposal of residual product. CAUTION! Fluorine in a cleaner causes “smut” (a dark discoloration on silicon-alloy aluminum castings), and paint will not stick to “smut”.
If this happens, sand the surface and start over using a different acid cleaner. 7. Rinse with water thoroughly and allow to air dry. 5. Apply finish coat. Volvo Penta Parts Catalogs and the Volvo Penta Parts and Accessories Catalog list part numbers for the finishing products that apply to your Volvo Penta product. VPA 7743722 English 10-2004 97