GOVERNOR AND FUEL INJECTION PUMP 6N0256 - Caterpillar

3408 And 3412 EnginesDescription of Change: New adapter assemblies are used in the cylinder head groups on the above engines. Less torque is used to install these adapters in the cylinder head. Because less torque is used, damage to the cylinder head and/or adapter can be prevented. Formerly, if too much torque was used to tighten the adapter, damage to the cylinder head and/or adapter could result. New clamps and sleeves are used with these new adapters to hold the fuel nozzles and valve bodies in position. Formerly nuts were used.
Adaptable As: The new adapter assemblies are direct replacements for the former adapter assemblies when used with the other parts shown in the chart. When the new adapter assembly is installed in the cylinder head, it should be tightened to a torque of 135 5 N m (100 4 lb ft). Tighten the bolts that hold the clamp in position to a torque of 31 7 N m (23 5 lb ft).
Illustration 1. Location of new parts in the cylinder head groups.
Illustration 2. Location of new parts in the fuel lines groups.