1994/09/01 Caterpillar

New Gears And Pipe Plugs In Auxiliary Drive Group {1150,1165}

Usage:

3508 (97Y),
3512 (51Y),
3516 (28Z) Vehicular Engines

Description of Change: New gears have been added to the rear auxiliary drive group. The new gears help to reduce the noise generated from the gear train. If the engine is exceeding noise level standards, new gears can be installed to reduce the overall noise generated by the engine.

New pipe plugs have also been added to the auxiliary drive group. The new plugs are coated with a special material. This coating makes installation easier and helps retain the plugs in the housing assembly.

Location of new auxiliary drive group (Rear) components. 7X-7731 Pipe Plug (1). 8T-6757 Pipe Plug (2). 107-8748 Auxiliary Drive Gear (3). 107-8749 Auxiliary Drive Gear (4).

Adaptable To: The new components in the 2W-8364, 7E-6620, and 9Y-8899 Auxiliary Drive Groups are identified in the illustration and chart. The new components are direct replacements for the former components. The former auxiliary drive gears are canceled.

Caterpillar Information System:

1994/09/01 New Gasket Provides Improved Sealing Between Air Compressor And Drive {1803}

1994/09/01 New PSG Governor With Pneumatic Air Head Control Available {1264}

1994/09/01 New Seals In Pump Fastener Group And Fuel Injection Pump Group Have Improved Heat Set Resistance {1251}

1994/09/01 Remanufactured 3400 Cylinder Heads Now Use Intake And Exhaust Valves With Chrome Plated Valve Stems {1105}

1994/09/01 Different Valves And Valve Seats Used In Remanufactured Cylinder Head Groups {1103,1105}

1994/09/01 Longer Studs And Spacers Used To Retain Exhaust Manifolds {1059}

1994/09/01 New Turbocharger Increases G3412 Engine Performance {1052}

1994/09/01 New Fuel Priming Pump Assembly Used In Fuel Priming Pump Group {1258}

1994/09/01 Improved Fuel Pump Bonnet Seals Have Better Heat Resistance {1251}

1994/09/01 Tachometer Adjustment To Read Correct Engine RPM; Instrument Background Lighting {7451,7462}

1994/09/01 Use Of 4C-4377 Stress Plate Group In 3114 And 3116 Cylinder Block Reconditioning {0672,0673,1201}

1994/09/01 Cylinder Head Bolt Tightening Procedure {1100}

1994/09/01 New Cylinder Liner, Spacer Plate, Spacer Plate Gasket, And Cylinder Head Gasket Used {1216,1221,1124}

1994/09/01 New Plunger In Fuel Pressure Regulating Valve {1250}

1994/09/01 New Gasket Used In The Water Lines Group {1380}

1994/09/01 Improved Knock (Detonation) Sensor Group Replaces Detonation Sensor {1559}

1994/09/01 New Operation And Maintenance Videos Available {0374}

1994/09/01 Turbocharger Turbine Nozzle Reusability Information {1052}

1994/09/01 Use Thread Lock On Bolts That Fasten Aftercooler Housing To Cylinder Block {1063}

1994/09/01 New Rear Camshaft Segments With Stronger Camshaft Flange Used {1210}

1994/09/01 Reworking Diesel And Gas Cylinder Heads On 6.25 Bore V Engines {1101}

1994/09/01 Different Emergency Stop Push Buttons for Electronic Modular Control Panel II (EMCP II) {4490,4450}

1994/10/01 New Rear Crankshaft Seal Groups Available {1161}

1994/10/01 Fuel Priming Pump Can Be Installed On Either Left Or Right Side Service Fuel Filter Groups {1258}