1997/09/15 Caterpillar

Improvements Made For Exhaust Manifold Groups{1059}

Usage:

3508B (2BM, 3DM, 7SM) Marine Engines

Description of Change: Several components of the exhaust manifold in the above engines has changed. The exhaust seal, exhaust tube, and the adapter have been replaced by improved parts. The improved parts provide a more leak free and longer lasting exhaust balance tube.

Adaptable To: The 9Y-4864 and 123-0324 Exhaust Manifold Groups have changed:

* The 141-9286 Adapter replaced the former 133-9311 Adapter.

* The 141-9287 Tube replaced the former 135-0173 Exhaust Tube.

* The 147-6621 Exhaust Seal replaced the former 135-0171 Exhaust Seal.

Typical view of the exhaust manifold group. (1) 141-9286 Adapter. (2) 141-9287 Tube. (3) 147-6621 Exhaust Seal.

NOTE: The 133-9315 V-Band Clamp and the 135-0172 Exhaust Seal Ring are no longer used within the 9Y-4864 and 123-0324 Exhaust Manifold Groups. When servicing the former adapter, exhaust tube, and exhaust seal with the improved adapter, tube, and exhaust seal, the 133-9315 V-Band Clamp and 135-0172 Exhaust Seal Ring must be removed.

The improved 9Y-4864 and 123-0324 Exhaust Manifold Groups are effective with the above engines and adaptable back to first production.

Caterpillar Information System:

1997/09/15 3406C Pump And Governor Changes Provide Improved Oil And Fuel Leak Resistence{7555}

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}

1997/09/15 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}

1997/09/15 Stainless Steel Instrument Panel Lines Groups Are Used{7451}