1997/07/01 Caterpillar

Governor Control Cover Assembly Includes New Seal And Improved Cover{1264}

Usage:

3306B (63Z),
3306C (7RJ, 9TL) Truck Engines

Description of Change: The governor control cover assembly used on these truck engines includes a new governor shaft seal and an improved governor control cover. The new seal is more resistant to heat damage than the former seal. The improved governor control cover provides governor shaft support. This helps reduce side loading of the seal which can result in seal damage.

Adaptable To: The part number of the 7N-8780 Governor Control Cover Assembly (with the improved governor control cover and new 138-9507 Seal) has not changed. The improved governor control cover is not serviced separately and is only available as the 7N-8780 Governor Control Cover Assembly. The new 138-9507 Seal is a direct replacement for the former 5P-3272 or 8T-2604 Seals. The new seal is adaptable to all earlier governor control cover assemblies.

The 7N-8780 Governor Control Cover Assembly (with the improved governor control cover and new 138-9507 Seal) is effective with 3306C (9TL15879) Truck Engine.

Caterpillar Information System:

1997/07/01 Manufacturing And Design Improvements Incorporated Into Fuel Injection Nozzle Assemblies{1252,1307}

1997/07/01 Electronic Display Groups Available For English/Spanish And English/French{7490}

1997/07/01 Electronic Control Module (ECM) Part Number Changes{1901}

1997/06/23 A New And A Remanufactured TU-FLO 1400L Air Compressor Group Is Available{1803}

1997/06/23 Improved Piston Rings Available{1215}

1997/06/23 New Chrome-Plated Stem On Exhaust Valve Increases Valve And Valve Guide Wear Life{1105,1100}

1997/06/23 Mechanical Unit Fuel Injector Groups Spill Shield Changed{1290}

1997/05/27 New Alternator Now Used{1405,7168}

1997/05/27 New Idler Gear Stub Shaft Assembly And Idler Gear Assembly Used In Front Gear Group{1206}

1997/05/27 Improved Brackets Used In Refrigerant Compressor Mounting Groups{1802}

1997/05/27 Special Installation Procedure For Alternator Support Brackets{1405}

1997/05/27 Procedure To Investigate Misfires On Engines Equipped With Electronic Unit Injectors (EUI){1290}

1997/07/01 "T" Adapter Cable Assembly Available{1901}

1997/07/01 Cylinder Head Gasket Changed For Tu-Flo 550/750 Air Compressor Groups{1803}

1997/08/01 Lubricity Limit Added To Preferred Distillate Fuel Recommendation{1280}

1997/08/01 Changes For The C-10 And C-12 1998 Model Year Truck Engines{1000}

1997/08/01 Troubleshooting Tip For Inlet Air Heater (Flame Start){1090}

1997/08/01 Improved O-Ring Seals Replace Former O-Ring Seals In Oil Cooler And Oil Filter Base{1378,1306}

1997/09/19 Special Instruction Available For 141-7060 Injector Wiring Harness Connector Repair Kit To Repair Connectors On HEUI Wiring Harness Assembly{1408,1290}

1997/09/19 3406C O-Ring Seal And Gaskets Changes Provide Improved Oil And Fuel Leak Resistence In Pump And Governor{7555}

1997/10/20 New Troubleshooting Guide Available{0374}

1997/10/20 Unit Fuel Injector Group Now Includes Electronic Trim Code{1290}

1997/10/20 New Control (Air Inlet Heater) Available For Improved Weather Resistance{1090}

1997/10/20 Significant Improvement For Pump Impellers (Water Pumps){1364}