1997/03/01 Caterpillar

Improved Bushing O-Ring Seal Available For Injection Pump Groups{1251}

Usage:

3406B (6TB),
3406C (3ER),
3408C (9XM),
3412 (9XF) Industrial;
3406B (4TB),
3406C (1SS),
3408B (8RG),
3412 (3JK) Marine;
3406B (4RG, 4JK, 4PM),
3406C (4ZR, 1LS),
3412 (2WJ, 3LJ) Generator Set Engines

Description of Change: An improved O-ring seal replaces the former O-ring seal for the injection pump groups in the above 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 engines. The former 9X-7735 O-Ring Seal is still available for use in other applications.

Caterpillar Information System:

1997/03/01 4C-8180 Timing Tool Group Required For Checking And Adjusting Fuel Injection Timing On 3408C And 3412C High Performance Marine Engines{1250}

1997/03/01 Marine Transmission Oil Pressure Sensor Location{3323}

1997/03/01 Product Support Literature Available{0374,1000}

1997/03/01 Caterpillar Part Numbers Are Used For XQ Rental, Generator Set Circuit Breakers{4461}

1997/03/01 Diode Removed From Junction Box Group{1400,1417}

1997/03/01 New O-Ring Seal Used In Hydraulically Actuated Electronic Unit Injector (HEUI) Pump Group{1714}

1997/03/01 New Turbocharger Group And Air Cleaner Mounting Group Provide Improved Reliability{1051,1052}

1997/02/17 New Spark Plug Provides Better Heat Resistance {1555}

1997/02/17 New Relay Modules Replace Relay Assembly In Junction Box Groups {1400,1408}

1997/02/17 Improved Tube Assemblies And Electronic Control Group (Pressure Module) Improves Reliability {1058,1285}

1997/02/17 New Rod Ends Used In Exhaust Bypass Groups {1057,1250}

1997/02/17 New Harness Assembly For 3500B Engines {1408}

1997/03/01 Improvements Made To Remanufactured 0R-3008 Fuel Transfer Pump{1256}

1997/03/01 The Components Of The 7C-5001, 100-8227, And 104-6775 Gas Pressure Regulator Groups Are Available For Parts Service{1270}

1997/03/01 New Terminal-Mounted Resistor Assembly Allows Proper Loading Of Digital Diagnostic Tool Data Line{1417}

1997/03/01 New "E" Rating Of 1350 Horsepower Available For 3412C High Performance Marine Engine{1902}

1997/03/01 New Gasket Used In Turbocharger Groups{1052,1061}

1997/03/01 New Adapters In Turbocharger Groups Provide Improved Sealing Between The Turbocharger And Exhaust Elbow{1061,1065}

1997/03/01 New Gasket Used In Aftercooler Groups{1063}

1997/03/01 Improved Fan Spider Assembly Available{1356}

1997/03/01 New Electronic Actuator Group Provides Improved Reliability{1050,1250,1900}

1997/03/01 Valve Rotator Inspection{1109}

1997/03/01 New Procedure For Tightening Bolts On Center Cluster Stub Shaft And Camshaft Idler Stub Shafts In Rear Gear Groups{1206,1237}

1997/03/01 Improved Junction Box Group (Inline){7451}