Improved Bushing O-Ring Seal Available For Injection Pump Groups{1251}
Usage:
3406B (7FB, 7XC, 8TC, 4MG, 5YG, 3ZJ, 5KJ, 2EK, 4CK),
3406C (3ZJ, 4CK, 8PN) Truck Engines
Description of Change: An improved O-ring seal replaces the former O-ring seal for the injection pump groups in the above truck engines. The improved O-ring seal has a slightly larger outside diameter which creates a better pilot surface on the bushing chamfer during assembly. The chance of cutting the seal is lessened. The improved O-ring seal is identified by its pink color. The former O-ring seal is blue in color.
Adaptable To: The improved 131-3719 O-Ring Seal replaces the former 9X-7735 O-Ring Seal in the above truck engines. The former 9X-7735 O-Ring Seal is still available for use in other applications.
Caterpillar Information System:
1997/02/24 New Specifications For Pressure Drop Across The Air-To-Air Aftercooler{1063}
1997/02/24 New O-Ring Seal Used In Hydraulically Actuated Electronic Unit Injector (HEUI) Pump Group{1714}
1997/01/27 New Gasket Used Between Air Compressor And Front Housing{1803}
1997/01/27 Timing Procedure Aid -Alignment Of Timing Gear Marks On 3406 Engines{1206}
1997/01/27 Points To Remember When Replacing A Viscous Crankshaft Damper Assembly With A Rubber Crankshaft Damper Assembly{1205}
1997/01/27 Description Of August 1996 (AUG96) Software Modifications{1902}
1997/01/27 New Remanufactured Water Pump Groups Include Cast Iron Impellers{1361}
1996/12/23 New Oil Supply And Drain Lines In Turbocharger Oil Lines Groups Used With "Mid-Mount", "New Mid-Mount", And "Low Mount" Arrangements{1307}
1996/12/23 New Thinner Exhaust Manifold Gasket Used{1059}
1996/12/23 July 1996 Software Release{1902}
1996/12/23 Check Turbocharger Seals If There Is A Sudden Increase In Crankcase Blowby{1052,1317}
1996/11/01 Fuel Injection Pump Bushings Have New Groove Adjacent To Load Ring {1251}
1997/02/24 Summary Of Changes To Timing Advance Drive Groups (Update){1272}
1997/02/24 New Oil Supply And Drain Lines In Turbocharger Oil Lines Groups Used With "Mid-Mount", "New Mid-Mount", And "Low Mount" Arrangements{1307}
1997/04/01 Improvements Made To Remanufactured 0R-3008 Fuel Transfer Pump{1256}
1997/04/01 Description Of March 1997 (MAR97) Software Modifications{1920}
1997/04/01 New "Fuel System Reuse And Salvage Guides" Reference Manual Available{1250}
1997/05/27 Procedure To Investigate Misfires On Engines Equipped With Electronic Unit Injectors (EUI){1290}
1997/05/27 Special Installation Procedure For Alternator Support Brackets{1405}
1997/05/27 Improved Brackets Used In Refrigerant Compressor Mounting Groups{1802}
1997/05/27 New Idler Gear Stub Shaft Assembly And Idler Gear Assembly Used In Front Gear Group{1206}
1997/05/27 New Alternator Now Used{1405,7168}
1997/06/23 Mechanical Unit Fuel Injector Groups Spill Shield Changed{1290}
1997/06/23 New Chrome-Plated Stem On Exhaust Valve Increases Valve And Valve Guide Wear Life{1105,1100}