TURBOCHARGER GP 2385105 - Caterpillar

3406B (6TB16308-Up),
3406C (3ER946-Up) Industrial;
3406B (4TB5520-Up) Marine;
3406B (2WB17472-Up),
3406C (4ZR946-Up, 1LS312-Up) Generator Set EnginesDescription of Change: New O-ring seals (1) and (2) are used on the "through-head-adapters" (B) and "internal fuel lines" (C) in the fuel injection lines groups on these commercial engines. The new O-ring seals have increased resistance to heat damage.
Location of new 132-2072 O-Ring Seal (1) and 8L-2779 O-Ring Seal (2) in a typical fuel injection lines group. Cylinder Head (A). Through-Head-Adapter (B). Internal Fuel Line (C).Adaptable To: The new 132-2072 O-Ring Seal (1) is a direct replacement for the former 8M-4437 O-Ring Seal on the "through-head-adapters" (B) and the new 8L-2779 O-Ring Seal is a direct replacement for the former 1H-1023 O-Ring Seal on the "internal fuel lines" (C) in the fuel injection lines groups on these engines. The new O-ring seals are in effect as listed in the subtitle and can be used to replace the former O-ring seals on all earlier 3406, 3406B, and 3406C Industrial, Marine, And Generator Set Engines.