1997/09/15 Caterpillar

3406C Pump And Governor Changes Provide Improved Oil And Fuel Leak Resistence{7555}

Usage:

3406C (4ZR, 1LS) Generator Set;
3406B (6TB),
3406C (3ER) Industrial;
3406B (4TB) Marine Engines

Description of Change: A new O-ring seal and new gaskets are made with materials that are capable of resisting higher temperatures. As a result, the improved O-ring seal and gaskets can provide greater resistance to oil and fuel leaks in the pump and governor.

Adaptable To: Chart 1 lists the new and former O-ring seal and gaskets that are contained in the governor and fuel injector pump group on all 3406B and 3406C Engines with the New Scroll Fuel System (NSFS).

The new O-ring seal and new gaskets are adaptable to first production of the above 3406B and 3406C Engines. The new O-ring seal and new gaskets become effective with the engine serial numbers listed in Chart 2.

Illustration 1: 3406C Governor Group. (B) Rear view.

Illustration 2: View Of Section A-A From Illustration 1. (1) 144-0479 Gasket.

Illustration 3: 3406C Governor And Fuel Injection Pump Group. (C) Side view. (D) Rear view. (2) 144-0481 Gasket. (3) 8J-4351 O-Ring Seal. (4) 144-0478 Gasket. (5) 144-0480 Gasket.

Illustration 4: 3406C Fuel Injection Pump Group. (E) Front view. (6) 144-0482 Gasket.

Caterpillar Information System:

1997/09/15 New Dual Stage Torsional Coupling Assembly Available For Use With Twin Disc MG 514C Marine Transmissions{3357}

1997/08/01 Changes To Default Overcurrent Settings For EMCP II+ {4490}

1997/08/01 Guidelines For Electrically Grounding Gas Engines {7423}

1997/08/01 Fuel Injector Trim Set Screw {1290}

1997/08/01 New Schedule For Cleaning Unit Injectors In Engines In Heavy Fuel Oil (HFO) Applications {1290}

1997/08/01 New Gear Assemblies With A Stronger Shaft Are Used In Governor Drive Groups {1288}

1997/08/01 Procedures For Changing From Running On Heavy Fuel Oil (HFO) To Running On Distillate Fuel {1280}

1997/08/01 Connecting Rod Bearing Part Numbers {1203,1219,1230}

1997/08/01 Crankshaft Oil Passage Plugs {1202}

1997/08/01 New Torque Specification For Some Bolts In Valve Mechanism Group {1102,1123}

1997/08/01 Revised Starting Procedure For Engines Using Kiene Valves {1100}

1997/08/01 New Manual Valve Group [Measure Cylinder Pressure (Kiene® Valve)] Used; Kiene Valve Installation Procedure {1100,1118}

1997/09/15 Improvements Made For Exhaust Manifold Groups{1059}

1997/09/15 New Exhaust Shield Groups Use Soft Wrap Insulation Instead Of Hot Box Shielding{1067}

1997/09/15 Instrument Panel Lines Groups Changed In Order To Improve Mounting Of The Fumes Disposal Group{1071}

1997/09/15 New Spark Plug On G3500 Engines Improves Reliability{1555}

1997/09/15 Self-Locking Bolt Used On Cylinder Block Cover Groups{7553}

1997/09/15 Stainless Steel Bolts Replace The Former Waspaloy Bolts{1059}

1997/09/15 Bellows Replaces Flange And Pipe In Water Aftercooler Groups{1063}

1997/09/15 New Manifold Soft-Wrap Shields Improve Reliability{1067}

1997/09/15 Gas Admission Valve (GAV) Changed In Order To Provide For The Use Of Dial Indicator Settings{1102}

1997/09/15 Procedure For Disassembly And Assembly Of The Pressure Relief Valve{1233}

1997/09/15 New Diagnostic Logic Used In Personality Modules{1901}

1997/09/15 Metal Particle Detector Kit Is Available For Particle Sensor Groups And Particle Detectors{7400}