1997/08/01 Caterpillar

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

Usage:

3606 (8RB),
3608 (6MC),
3612 (9RC),
3616 (1PD) Engines In HFO Applications

Reference: Operation And Maintenance Manual; SEBU6966; 3606, 3608, 3612 and 3616 Industrial, Generator Set and Marine Engines; For Engines Operating On Heavy Fuel Oils.

Special Instruction, SEHS9741, "Cleaning 3600 Unit Injectors".

This article supersedes the article with the same title on Page 8 of the November 1995 issue.

The schedule for inspecting and cleaning the unit injectors in engines run on HFO has changed. Formerly, the recommendation was to remanufacture or rebuild the unit injectors after 10,000 hours of operation. The current recommendation is to clean the unit injectors after each 4,000 hours of operation. This scheduled cleaning can reduce the number of injector sticking incidents if completed properly and used in conjunction with proper operating procedures. Use the procedure provided in the Reference Special Instruction. This change is included and correct in the latest Reference Operation And Maintenance Manual for engines using Heavy Fuel Oils.

Caterpillar Information System:

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}

1997/08/01 Installation Procedure For Cylinder Head Studs {1100}

1997/08/01 Changes To Cylinder Head Salvage Procedure {1100}

1997/08/01 Air Quality Requirements For Turbocharger Air Impingement System {1052}

1997/08/01 New Specification For Clearance Between Turbocharger Turbine Wheel Blades And Turbine Wheel Cover Ring {1052}

1997/08/01 New Turbocharger Wash Water Lines Groups Used {1052}

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

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

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

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

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

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}