1996/03/04 Caterpillar


Ring Seals No Longer Required At Six Locations In Turbocharger Groups{1052}

Usage:


793 (3SJ),
793B (1HL) Off-Highway Trucks

Description of Change: The ring seals are no longer required at six locations in the turbocharger groups used on the 3516 (54Z, 2PK) Machine Engines used in these trucks. See the illustrations.


Illustration 1. (Right Side View Of Typical Turbocharger Group) Locations of 4P-8597 Ring Seals (1) and 7E-4107 Ring Seals (2) that are no longer required.


Illustration 2. (Top View Of Typical Turbocharger Group) Locations of 7E-2326 Ring Seals (3) that are no longer required.

Adaptable To: Two 4P-8597 Ring Seals (1), two 7E-4107 Ring Seals (2), and two 7E-2326 Ring Seals (3) have been removed from the 108-5559 and the 9Y-8911 Turbocharger Groups. This change is effective with 3516 (54Z1111, 2PK873) Machine Engines. These seal rings can be removed from the 108-5559 and the 9Y-8911 Turbocharger Groups on earlier 3516 (54Z, 2PK) Machine Engines at overhaul.

NOTE: At the above effective engine serial numbers, only the ring seals were removed. The grooves in the housings are still present. The ring seals can be left out even when the grooves in the housings to accept the ring seals are present.

Caterpillar Information System:

1996/02/26 New Engine Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}
1996/02/26 New Troubleshooting Guide Is Needed To Test The Grade/Slope System{7219,7569}
1996/02/26 New Hoist Valve Reduces Leakage{5136}
1996/02/26 New Rubber Belt Step Available{7254}
1996/02/26 Magnetic Plug Now Used On Front Wheels{4208}
1996/02/26 Service Manual And Service Kits Available For Engine Variable Speed Fan Clutch{1359}
1996/02/19 New Brackets Help Prevent Damage To Engine Fuel Injection Lines Groups{1252}
1996/02/19 New Material Used In O-Rings And Optional New Block Side Cover Replacement{1201}
1996/02/19 New Bolts And Washers Used In Rear Axle Spindle To Rear Axle Joint Provides Additional Strength To Prevent Bolt Breakage{3260}
1996/02/19 Use Of BIO HYDO Oils in Off-Highway Trucks{3022}
1996/02/12 Closed Engine Crankcase Breather System Maintenance And Repair {1317,1107}
1996/02/12 New Components Used In Governor And Fuel Pump Drive Group{1288}
1996/03/04 New Interaxle Differential Groups Have New Thrust Discs For Improved Service Life{3258,3287}
1996/03/04 Dimensions For Radio Installation {7338}
1996/03/04 Flash Programming Capability Is Required{1901,1902}
1996/03/11 New Transmission Input Shaft Seal Prevents Leakage{3189,3401}
1996/03/11 Undercarriage Gauge and Belt Width Options{4150,4199,4198}
1996/03/11 Improved Mounting And Valve Group (Retarder Control Valve) Can Be Installed To Improve Retarder Control Valve Service Life{3123}
1996/03/11 New Drum Support Gearbox Used To Improve Service Life{4053}
1996/03/11 New Logic Valves Stop Conveyor Belt Creep{6620,5051}
1996/03/11 Speed Sensor Group Contains New Gear Mesh Adjuster Parts For Feet Per Minute Encoder{7495}
1996/03/11 Working Load Limits For Forcing Screws, Puller Bolts and Studs{0700}
1996/03/18 Belt Tensioner Cylinder Nitrogen Precharge Pressure Increased {4197}
1996/03/18 New Track Alignment Procedure {4198}
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