TRANSMISSION AR 6I8425 - Caterpillar

3408 And 3412 (99U, 60M, 1LG, 7HG, 78Z, 81Z, 8RG, 3JK) Marine Propulsion and Auxiliary Engines;
3408 and 3412 (67U, 38S) Industrial EnginesReference: Service Magazine; August 31, 1987; Page 11; "Recommendations For Preventing Cooling System Damage. "Reference: "Coolant And Your Engine," Form SEBD0970.Description of Change: A new cast iron water pump adapter is used. The new adapter is more resistant to erosion caused by incorrect cooling system maintenance, water pump inlet restrictions or improper electrical grounding.Adaptable To: The new 1012749 Adapter (Cast Iron) is a direct replacement for the former 7C1652 Adapter (Aluminum). See the chart for effective serial numbers. If the 7C1652 Adapter is eroded, the cause of the erosion must be determined and corrected before installing the new adapter. Damage to other components such as cylinder liner pitting can be caused by coolant with a low concentration of or no coolant conditioner.