1992/05/18 Caterpillar

New Turbocharger Groups Help Prevent Surge (Popping){1052}

Usage:

3306B ( 5KD2531-Up ) (COSA Only),
3306C ( 7RJ1-Up ) Truck Engines

Description of Change: A new turbocharger group is used on 3306B (5KD) Truck Engines and a different new turbocharger group is used on 3306C (7RJ) Truck Engines. Both new turbocharger groups help prevent compressor surge (popping).

The new turbocharger group used on 3306B (5KD) Truck Engines features:

* S4D turbocharger design.

* Compressor design with improved flow to eliminate surge at lug.

The new turbocharger groups used on 3306C (7RJ) Truck Engines feature:

* S3B turbocharger design.

* Recirculation groove in the compressor housing prevents surge in deep lug. May whistle at lighter engine loads which will NOT cause engine damage.

* Non-serviceable wastegate enclosed by "staked" cover. (22.5 ± .5 psi pressure should move the control rod 0.020 in)

NOTE: Tampering with the wastegate can cause increased engine loads which will cause reduced engine reliability and/or life.

Adaptable To: The new 6I1695 Turbocharger Group is in effect with 3306B Truck Engine 5KD2531. The new turbocharger is adaptable to earlier engines.

The new 6I0635 Turbocharger Group, 4P9585 Turbocharger Group, and 4P9584 Turbocharger Group are in effect with 3306C Truck Engine 7RJ1.

Caterpillar Information System:

1992/05/18 Spring Used To Hold Valve In Position In Remanufactured Fuel Transfer Pumps{1256}

1992/05/18 Fuel Injector Group Rack Movement{1290}

1992/05/11 New Components In Aftercooler Water Lines Group Help Reduce Vibration{1380}

1992/05/11 Procedure for Cleaning an Engine Lubrication System when Contaminated with Engine Coolant Containing Antifreeze{1300,1350}

1992/05/11 Troubleshooting 04 Diagnostic Code On Electronic Modular Control Panels (EMCP){4490,4450}

1992/04/20 New Auxiliary Sea Water Pump Group Available{1371}

1992/04/20 Improved Woodward PSG Governor Groups And Improved Carburetor Control Groups Provide Improved Governor To Carburetor Linkage Control{1264,1265}

1992/04/20 Component Cross Reference Lists For Programed Electronic Engine Control (PEEC) Systems{1900}

1992/04/20 Identification Of Remanufactured Direct Injection Fuel Nozzles (DIFN){1254}

1992/04/20 Procedure To Repair Damaged Oil Pan Drain Hole Threads{1302}

1992/04/20 Be Sure To Use Correct Installation Procedure For Core Plug Block Heaters (Engine Coolant Heaters){1383}

1992/04/20 Newer Oil Formulations For Caterpillar Engines{0374,1300}

1992/05/18 New Throttle Actuator In Governor Groups Improves Engine Stability{1289}

1992/05/18 New Turbocharger Groups Used{1052}

1992/05/18 New And Remanufactured Fuel Injector Reference{1290}

1992/05/25 O-Ring Material, Size, Cross-Reference, And New O-Ring Sizing Cone Information Available{0374}

1992/05/25 Hydraulic Cylinder Seal Information Available{0374}

1992/05/25 New Components Help Prevent Air Leaks In Improved Fuel Ratio Control Groups{1278}

1992/06/15 3F1006 Switch Assembly Now Serviced By Improved 3D9718 Switch Assembly; Procedure To Correctly Install Improved 3D9718 Switch Assembly{1435,1416,7429}

1992/06/15 Battery Shelf Life Guidelines{1401}

1992/06/15 4P6493 Governor Information Plate Available{7557}

1992/06/15 New Diaphragm Used In Fuel Ratio Control Groups{1278}

1992/06/15 New Exhaust Bellows Used In Turbocharger Group{1052}

1992/06/22 New Radial Seal Air Filter Elements And Conversion Kits Available For Parts Service{1054,1051}