1991/04/08 Caterpillar

New Bolt Improves Retention Of Backplate To Housing Assembly In Turbocharger Cartridge Groups{1052,1053,1056,7553}

Usage:

3412 ( 38S, 60M, 7HG, 81Z );
3508 ( 23Z );
3512 ( 24Z, 49Y, 50Y, 51Y );
3516 ( 71Z, 72Z, 73Z ) Engines;
785 ( 8GB ) Trucks

Description of Change: A new locking bolt is used in the turbocharger cartridge groups. The new bolt provides increased retention between the backplate and housing assembly.

Adaptable To: The new 2J3118 Locking Bolt replaces the former 7W0468 Lock Plate and 1S7116 Bolt (both canceled). However, the 1S7116 Bolt may be reused if 9S3263 Thread Lock Compound is used. This change affects all TV91, TL91, TW91, TV92, TL92, and TW92 Cartridges used in the 7C2860, 7E0479, 7E9491, 4W1225, 4W1239, 4W4960, 4W9879, 7W1105, 7W2301, 7W3570, and 9Y1494 Cartridge Groups. This change is also adaptable to first production for all cartridges using the former 7W0468 Lock Plate. See the illustration for the typical location of the new bolt.

NOTE: The 4W4960, 7W2301, and 9Y1494 Cartridge Groups have been canceled and replaced by the 7E9491 Cartridge Group.

(1) Backplate Assembly. (2) Housing Assembly. (3) 2J3118 Locking Bolt. Tighten the new bolt to 39 ± 2 N·m (29 ± 1 ft lb).

Caterpillar Information System:

1991/04/08 Two Different Air Inlet Heater Control Modules Available{1090,1087,1058}

1991/04/01 Continuous Single Cylinder Misfire When Engine Is Under Load {1552}

1991/04/01 Remanufactured Type 1 Fuel Injector Assembly Available For 3500 Family Of Engines Equipped With UG8 Governors {1254,1264}

1991/04/01 Fuel Injection Pump Bushing Torque Increased {1253}

1991/04/01 New Performance Category For Engine Crankcase Oil {1318}

1991/04/01 Correct Position Of Lockwashers For Electrical Components With Screw Terminals {1400,7553}

1991/03/25 New Cylinder Blocks And Crankshafts Used{1201,1202,1231}

1991/03/25 New Shaft Bracket And Oil Supply Plug Used In Rocker Valve Shaft Assembly{1102,7553}

1991/03/18 New Air Compressor Crankshaft Has Improved Spline Lubrication{1803}

1991/03/11 4C6534 Harness Now Available To Set Engine Electronic Speed Switches{7427,0779,0785}

1991/03/11 1U5269 Mirror Tube Used With 1U5268 Borescope May Become Scratched{0777}

1991/03/11 New Rotocoil Used In Cylinder Head Group; New Valve Stem Oil Shield Used In Locomotive Engine Cylinder Head Group{1109,1100}

1991/04/08 New Carburetor Control Leakage Improves Idle Stability{1266}

1991/04/08 Remote Mounted Pressure Sensor Used In Temperature And Pressure Control Group In Electronic Modular Control Panel (ECMP){4490}

1991/04/15 Simplified Battery Test Procedure SEHS7633-02 And Battery Test Sheet SEHS9326 Available{1401}

1991/04/15 New Specification For Transmission And Drive Train Oil (TDTO){0645,3004,3150,3179}

1991/04/15 New Auxiliary Water Pump Used; New Chart Lists Auxiliary Water Pump Group Numbers, Pulley Sizes, And Drive Belts{1371,1357,1384}

1991/04/15 New Shaft Bracket And Oil Supply Plug Used In Rocker Valve Shaft Assembly{1102,7553}

1991/04/15 New Oil Filter Element Assembly Used In Oil Filter Groups{1318}

1991/04/22 Procedure For Applying 1U8846 Gasket Maker{0648,7555}

1991/04/22 Procedure To Set Voltage Droop On SR 4 Generators With VR3 Voltage Regulators Using Resistive Load Bank{4475,4467}

1991/04/22 6L7896 Starting Motor (24V DC) Is No Longer Available From Caterpillar{1453}

1991/04/22 New Diagnostic Code 28 "Check Throttle Sensor Adjustment" Is On 1991 Engines{1900}

1991/04/22 Special Instruction, SEHS9340, Gives Jacket Water Heater Installation Procedures{1383}