Preliminary Requirements

Safety Requirements

WARNING

IT IS THE RESPONSIBILITY OF THE OPERATOR TO OBTAIN AND OBSERVE THE MANUFACTURERS MATERIAL SAFETY DATA SHEETS FOR CONSUMABLE MATERIALS SAFETY INFORMATION (SUCH AS HAZARDOUS INGREDIENTS; PHYSICAL/CHEMICAL CHARACTERISTICS; FIRE, EXPLOSION, REACTIVITY, AND HEALTH HAZARD DATA; PRECAUTIONS FOR SAFE HANDLING AND USE AND CONTROL MEASURES) AND ALSO TO TAKE LOCAL REGULATIONS INTO CONSIDERATION.

SATISFACTORY FUME REMOVAL IS NECESSARY, WHERE THESE PAINTS ARE APPLIED, AND THE STOVING OVENS MUST BE FULLY OPEN TO THE AIR.

UNWANTED GASES FROM THE OVEN HEATING SYSTEM, MUST BE REMOVED FROM THE STOVING OVENS.

THE OVENS MUST ALWAYS BE FULLY OPEN TO THE AIR DURING THE STOVING PROCEDURE, AND OPERATORS MUST NOT OPEN THE OVEN DOORS TO PUT IN MORE PARTS, DURING THIS PROCEDURE.

CAUTION

CLEAN PAINT SHOP CONDITIONS MUST BE KEPT TO PREVENT CONTAMINATION FROM DUST, HIGH TEMPERATURES, AND HUMIDITY. THE AIR MUST BE FILTERED, TO PREVENT CONTAMINATION FROM OIL AND WATER.

CLEAN GLOVES MUST BE WORN WHENYOU TOUCH PARTS MADE CLEAN FOR PAINTING.

Procedure

1. SUBTASK 70-38-35-380-001 Make-up and Control of High-heat Resisting Stoving Enamel

   1. CoMat 07-075 HIGH-HEAT RESISTING STOVING ENAMEL contains an aluminum filler, and is only available in that color.

   2. Prepare the enamel in accordance with the manufacturer's instructions.

      1. Guidance note: Mix fully and add thinner if necessary to get the necessary viscosity. Use only the thinner that is specified in the manufacturer's instructions.

2. SUBTASK 70-38-35-380-002 General Procedures

   1. Prepare the parts for enamelling.

      1. If necessary, remove unwanted paint as detailed in the Engine Manual or the detail given. Refer to SPM TASK 70-11-05-300-503.

      2. Use jigs or apply CoMat 02-001 ADHESIVE TAPE (MASKING), or CoMat 02-005 ADHESIVE TAPE (MASKING), to areas not to be painted.

      3. Abrasive blast with CoMat 05-003 ABRASIVE MEDIUM ALUMINUM OXIDE, 120/220 GRADE - (refer to SPM TASK 70-12-01-120-501 and SPM TASK 70-12-02-120-501) unless the parts are electro-etched.

      4. Remove the masking tape.

      5. Degrease the parts - (refer to SPM TASK 70-11-01-300-503 or SPM TASK 70-11-14-300-503).

   2. NOTE

      Enamel is not usually applied to phosphated surfaces; but it can be applied to the phosphated surfaces, of parts used below 572 deg F (300 deg C), when specified in the Engine Manual.

      If it is necessary to phosphate unpainted areas, the parts can be phosphated; after they are enamelled.

      The Engine Manual tells which areas are not to be given the full enamel procedure, which areas are to be given one layer only and which areas are to be phosphated.

      Apply enamel to the parts. Use one of the subsequent procedures:

      1. Brush Or Spray Procedure.

         1. 

            CAUTION

            OIL AND GREASE MUST NOT BE USED, TO STOP-OFF THE PARTS.

            THE ENAMEL MUST BE FULLY MIXED, UNTIL NO UNWANTED ALUMINUM IS BONDED TO THE MIX TOOL.

            Use plates, plugs or CoMat 02-019 TAPE, ADHESIVE PAPER HEAT RESISTING MASKING, to stop-off the areas which are not to be enamelled and those areas which are to be given one layer only.

         2. NOTE

            The viscosity of the enamel must be as specified in Step.

            Use a clean, good quality, brush or spray gun to apply one layer of enamel. Let the enamel dry in ambient air (61 deg F (16 deg C) minimum) for five minutes minimum.

            NOTE

            When a static-type oven is used, the flash-off time must be obeyed. When a conveyor-type oven is used, where the temperature increase is slow and gradual with longer stoving times, a flash-off time is not necessary.

            One coat of CoMat 07-075 HIGH-HEAT RESISTING STOVING ENAMEL can give a coating thickness of approximately 0.025 mm (0.00098 inch).

         3. Use the brush or spray gun to apply more coats as necessary to get the specified coating thickness. Let dry in ambient air (61 deg F (16 deg C) minimum) for 30 minutes minimum to flash-off.

         4. Carefully remove the masking tape.

         5. Stove the part at 365 deg F to 383 deg F (185 deg C to 195 deg C) for two hours minimum.

         6. Make regular enamel thickness checks. The complete enamel procedure must give a minimum thickness of 0.025 mm (0.00098 inch) .025 mm (0.00098 inch) and a maximum thickness of 0.075 mm (0.0030 inch) if the enamel thickness is not specified.

         7. Examine the enamel coating.

            1. All areas of the enamel coating must be approximately equal in color, and there must be a full layer of enamel coating on all areas where the enamel coating is specified.

            2. If small areas of the enamel coating are unsatisfactory, repair the unsatisfactory areas by Step.

            3. If the enamel coating is generally unsatisfactory, do the subsequent procedure:

               1. Remove the enamel coating by SPM TASK 70-11-05-300-503.

               2. Do again the Brush Or Spray Procedure steps above.

      2. Pouring Procedure.

         1. When the Engine Manual specifies to apply enamel to areas where access by the Brush or Spray procedure is not possible, it is permitted to use the Pouring procedure.

            1. Use the manufacturer's instructions for the make-up of the paint.

            2. Put the necessary quantity of enamel into the closed area. Turn the part to make sure that all internal surfaces are correctly painted.

            3. Drain the unwanted enamel from the internal areas, then remove all unwanted enamel from the outer surfaces with a clean, lint-free, cloth made moist with the thinner that the manufacturer's instructions specify to use with the enamel.

            4. Let the part dry in ambient air (61 deg F (16 deg C) minimum) for 30 minutes minimum, then stove at 288 deg F to 316 deg F (142 deg C to 158 deg C) for 30 minutes minimum.

            5. If the enamel thickness is between 0.025 mm and 0.05 mm (0.00098 inch and 0.002 inch), go to the subsequent Pouring Procedure step to dry and stove the paint. If the enamel thickness is below these limits, do Step again.

            6. Let the part dry in ambient air (61 deg F (16 deg C) minimum) for 30 minutes minimum, then stove at 365 deg F to 383 deg F (185 deg C to 195 deg C) for two hours minimum.

   3. Make an inspection of the enamelled area, for a complete and constant finish. Blisters, drops, runs, tears or other defects cannot be accepted. If there is local damage, do the procedure specified in Step, Local Procedures.

   4. When the enamel finish is satisfactory, apply protection to the non-painted areas; with CoMat 10-022 PRESERVATIVE OIL.

3. SUBTASK 70-38-35-380-003 Local Procedures

   1. If there is damage to the enamel, do the procedure that follows:

      1. Rub-down all damaged and adjacent areas with CoMat 05-020 WATERPROOF SILICON CARBIDE or CoMat 05-021 WATERPROOF SILICON CARBIDE to remove all surface contamination or surface gloss from the enamel.

      2. Locally remove grease, with cold liquid degreaser, as specified in SPM TASK 70-11-01-300-503. Let the part dry fully.

      3. Use the procedure that follows, to touch-up and dry the damaged areas:

         1. Touch-up the damaged area with CoMat 07-075 HIGH-HEAT RESISTING STOVING ENAMEL, then stove at 365 deg F to 383 deg F (185 deg C to 195 deg C) for two hours minimum.

         2. When stoving is not possible, apply a layer of CoMat 07-038 AIR DRYING ENAMEL. Let the enamel dry in air at 61 deg F (16 deg C) minimum for a minimum of one hour before it is touched.