SLEEVE 5K2650 - Caterpillar

the catalyst substrate from the catalytic converter. Perform a visual inspection of the catalyst substrate. Look for discoloration, buildup of foreign deposits, and a uniform coating on the surface of the substrate.If the catalytic converter has been operating normally, the substrate will be tan or dark brown. Small amounts of gray and white ash may exist. If either of these conditions occur, but the exhaust system back pressure is normal, and the temperature differential across the converter is between 0°C (32°F) and 40°C (72°F), no corrective action is required.Record the physical appearance, condition, and color of the substrate. If the catalytic converter appears to have been operating normally, install the substrate to the catalytic converter.If any of the following are observed, refer to System Operation, Troubleshooting, Testing and Adjusting, KENR9788, "Catalytic Converter Substrate - Inspect" for the proper corrective action:
soft black sooty deposits on the substrate
carbon fouling of the substrate
large amounts of powdery gray and white ash covering the substrate
dark bronze or black color on the substrate
white powdery appearance