1992/12/21 Caterpillar

New Bellows Assemblies Used In Turbocharger Groups{1052,1059}

Usage:

3508 (96Y) Marine;
3512 (50Y, 66Z) Marine;
3516 (29Z, 72Z) Marine;
3516 (27Z) Industrial;
3516 (25Z) Generator Set Engines

Description of Change: New bellows assemblies are used in the turbocharger groups on the above engines. See the illustration. The new bellows assemblies will provide increased reliability and easier assembly.

Typical location of new bellows assemblies and half flanges.

Adaptable To: The new and former components of the turbocharger groups are identified in the charts. The new components are in effect as follows:

* Chart A is for 3508 Marine Engine 96Z1232-Up and 3512 Marine Engine 66Z474-Up.

* Chart B is for 3512 Marine Engine 50Y1043-Up and 3516 Marine Engine 72Z438-Up.

* Chart C is for 3516 Marine Engine 29Z1004-Up, 3516 Industrial Engines 27Z, and 3516 Generator Set Engines 25Z.

The former components identified in the charts are canceled and replaced by the new components. The new components, when used together, can be used on all earlier engines.

Caterpillar Information System:

1992/12/21 Modifying Former 2W8888 Rocker Arm Shaft For Use With New 8T7581 Rocker Arm Shaft Bolt{1102}

1992/12/21 New Cylinder Head Bolt Tightening Procedure{1100}

1992/11/30 New Cast Iron Deaerators Replace Former Aluminum Deaerators{1350}

1992/11/30 Procedure To Clean High Performance Marine Engine Air Filter{0374,1054}

1992/11/30 Procedure To Replace Cylinder Head Gasket{1124}

1992/11/30 New Fuel Priming Pump Kit Available{1258}

1992/11/30 Left Handed Threads In Compressor Nut On Some Caterpillar Turbochargers{1077,1053,1052}

1992/11/30 New Oil Pump Used As Service Replacement{3310}

1992/11/30 New Unit Injector Sleeve Used In Cylinder Head Groups{1125}

1992/11/30 New Cylinder Head Gasket Used{1124}

1992/11/30 Reporting Incidents{0337}

1992/11/23 Oil Filter Group Improved{1318}

1993/01/18 New Videotape "Detection of Air and Combustion Gases in the Cooling System" Available {0374,1350}

1993/01/18 Part Number References For 0R2818, 0R2819, And 0R3231 Remanufactured 3208 Truck Engines {0374}

1993/01/18 Cylinder Pack Puller Groups Improved {0705,1239}

1993/01/18 New And Remanufactured Fuel Injector Reference {1290}

1993/01/18 New Grommets With Higher Temperature Capacity Used In Clamp Assemblies {1307,1052}

1993/01/18 New Exhaust Manifold Group Will Help Reduce Vibration On Bellows {1059}

1993/01/18 New Cylinder Head Group Used To Help Reduce The Amount Of Oil On The Valve Stems {1102,1109,1104}

1993/01/25 New Connecting Rod Bearing Used In Piston And Rod Groups {1219}

1993/01/25 Special Instruction For Installing VR3 Voltage Regulator On SR4 Generators Now Available {4450}

1993/01/25 Drive End Bearing Service For 50/75 Amp Brushless Alternators {1405}

1993/01/25 Unit Injector Tip Seal Deterioration {1290}

1993/01/25 Check Engine Water Pump Impeller Face Clearance If The Engine Experiences Symptoms Of Overheating {1361}