1994/03/01 Caterpillar

Improved Ceramic Turbocharger Group Used{1052}

Usage:

3406C (4CK) Truck Engines Rated At 460 Horsepower

Reference: Truck Engine News, January 1991, Page 2, "Update Information For Exhaust Manifolds." Truck Engine News, April 1992, Page 2, "New Turbocharger Groups With Ceramic Turbine Wheels Used."

Description of Change: The former ceramic turbine wheel was very sensitive to foreign object damage (FOD). Improvements have been made to the shape of the inducer (inlet) portion of the ceramic turbine wheel. These changes will improve the ceramic turbine blade's resistance to normal engine exhaust contamination.

Adaptable To: The new 108-5450 Turbocharger Group (Mid-Mount) and new 0R-6783 Remanufactured Turbocharger Group (Mid-Mount) are direct replacements for the former 6I-3029 Turbocharger Group (Mid-Mount) and 0R-6557 Remanufactured Turbocharger Group (Mid-Mount) respectively. The new 108-5451 Turbocharger Group (Low-Mount) and new 0R-6784 Remanufactured Turbocharger Group (Low-Mount) are direct replacements for the former 6I-3172 Turbocharger Group (Low-Mount) and 0R-6558 Remanufactured Turbocharger Group (Low-Mount) respectively. The Low Mount turbocharger groups are used on engine arrangements for Ford and on all Australian engine arrangements. The former turbocharger arrangements are canceled. The new turbocharger groups are in effect with 3406C Truck Engine 4CK18528.

The improved ceramic turbine wheel has been used in the former turbocharger groups since approximately 3406C Truck Engine 4CK15000.

Caterpillar Information System:

1994/03/01 Improved 1R-0712 Fuel Filter Available{1261}

1994/03/01 New Seal Used In Air Lines Group{1058}

1994/02/01 New 7X-1715 Cable Assembly (Small, 40 Pin Breakout) Available{0779,1900}

1994/02/01 September 1993 Personality Module Release Improvements{1902}

1994/02/01 Remove Internal Components From 4P-8454 Cover Assembly{1309}

1994/02/01 New Turbocharger Models Have Left-Hand Threads On Compressor Nut And Turbine Shaft{1053,1052}

1994/01/01 List of Service Publications{0374}

1994/01/01 New Pedal Mounted Throttle Position Sensor Available{1913}

1994/01/01 Fuel Injection Pump Improvements{1251}

1994/01/01 New Piston Body Has Improved Bonding Between Iron Band And Aluminum Body{1214}

1994/01/01 Flywheel Housing to Cylinder Block Joint Improvements{1157,1201}

1994/01/01 Cylinder Head Gaskets Improved To Provide Better Fire Ring Retention{1124}

1994/03/01 Electromagnetic Fan Clutch Available{1359}

1994/03/01 The Ninth Edition Of The Lubricating Oils Data Book Is Available From The Engine Manufactures Association (EMA) {1318}

1994/04/22 New Power Steering Pump Drive Gear Used In Accessory Drive Group{1207}

1994/04/22 New Air Compressor Drive Gear Used In Accessory Drive Group{1207}

1994/04/22 Identification Of Intake And Exhaust Valves That May Be Used In Remanufactured Direct Injected 3400 Cylinder Heads{1105}

1994/04/22 Fuel Injection Pump Improvements{1251}

1994/04/22 Final Control Group (Personality Module) Update{1902}

1994/04/22 Service Tools For Electronic Controls{0781,0782}

1994/05/31 Date Code On 7000 Series Fuel Injection Nozzles; New Seals Used In 7000 Series Fuel Injection Nozzles {1254}

1994/05/31 New Oil Cooler And Filter Base Assembly And New Oil Cooler And Filter Base Group Have Stronger Mounting Flanges {1378,1306}

1994/06/24 New Intake And Exhaust Valves Used{1105,1100}

1994/06/24 New Rocker Arm Adjustment Screw Used To Adjust Valve Clearance{1123,1100}