Volvo Penta drive painting procedure

derived from VP 2006 Engine Operator’s Manual

PARTS

• Part # 1141562 … Primer
• Part # 827502 ….. Clear Enamel
• Part # 3851219 … Paint, Drive Unit, Silver
• Part # 889968 ….. Drive Touch-up Paint Set: Silver + Clear Enamel
• DuPont 225S Aluminum Refinishing System Step A, Aluminum Metal Cleaner: an acidic metal cleaner and conditioner formulated for aluminum. DuPont 225S effectively removes corrosion resulting from weathering and prepares the surface for the use of DuPont 226S Aluminum Refinishing System Step B, Conversion Coating.
• DuPont 226S Aluminum Refinishing System Step B, Aluminum Conversion Coating: DuPont 226S was developed for use on aircraft, boats, commercial and other vehicles exposed to severe conditions. DuPont 226S chemically stabilizes aluminum, producing a high degree of corrosion resistance and adhesion for paint systems.
• Zinc Chromate, a potential substitute for Dupont 225S and 226S set: for use on aluminum surfaces above or below the waterline, this primer chemically etches into aluminum and forms a corrosion-resistant surface, it helps to create an even, bondable surface for top coat adhesion.
• 3M Scotchbrite Pad Medium

PROCEDURE

1. Remove all marine growth.

2. Remove all loose paint and corrosion by sanding or sandblasting. If sandblasting, use an aluminum oxide blasting media with a particulate size of 0.008-0.028 in. (0.2-0.7 mm).

3. Remove all trace of grease and wash with hot water and detergent. Roughen all painted surfaces with medium 3M ScotchbriteTM pad. Rinse thoroughly with water.

4. Treat any bare aluminum with chromate conversion coating. Clean the entire area with an acid cleaner that does not contain fluoride, such as DuPont® 5717. Scrub the surface with 3M ScotchbriteTM pad until it is completely “wetted” with no beads of water.

• NOTE: Fluoride in a cleaner causes a “smut” (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.
• NOTE: Do not use steel wool. Small pieces of steel wool become embedded in the aluminum and will cause severe corrosion.

5. Rinse thoroughly with water. The area must appear “wetted” or the surface is not clean, and paint will not adhere.

6. While the surface is still wet from rinsing, treat all bare aluminum with DuPont® 226S chromate conversion solution. Brush the chromate solution as required 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 label instructions exactly.

• 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.
• It is best to let the part air dry, but if you must wipe the surface to speed up drying, use lint free wipes not treated with anything that may contaminate the surface. Do not scrub the surface, wipe very lightly.
• Do not blow dry with shop air unless it is completely free of dirt, oil, and water.
• Do not heat the part above 150°F, before painting.
• Do not touch the treated surface with bare bands before painting.
• The part should be primed soon after it dries, or at least within 24 hours.

7. Where the prime coat is thin or where the surface is unpainted, prime with Volvo Penta Primer or PPG® Super Koropon epoxy primer. Do not apply primer over hard finish coat. Primer solvents must be allowed time to evaporate and the primer must harden before applying the finish coat. Allow 8 to 12 hours drying time.

8. Apply finish coat.
The parts catalogs list numbers for finishing products … see above.