1986/12/22 Caterpillar

New Torque Control Group Used In Governor And Fuel Injection Pump Group{1264}

Usage:

3406B Truck Engines With Air To Air Aftercooling (ATAAC) And 400 HP at 1800 RPM Rating

Description of Change: A new torque control group is used in the governor and fuel injection pump group on 3406B Truck Engines with ATAAC rated at 400 hp at 1800 rpm. The new torque control group allows more fuel delivery in a 200 rpm range below rated (full load) rpm. This results in improved engine response without change to the full load or full torque static fuel settings.

Adaptable To: The new 2W6660 Torque Control is a direct replacement for the former 2W8628 Torque Control Group in the governor and fuel injection pump group on 3406B Truck Engines with ATAAC rated at 400 hp at 1800 rpm. The OT6260 Performance Specification still applies to this engine. The components of the new and former torque control groups are the same except for the torque spring and shim. The new 2W6660 Torque Control adds 9L9347 Shim and has a 8N7520 Torque Spring instead of the 8N7518 Torque Spring in the former 2W8628 Torque Control Group.

Location of the components in the 2W6660 Torque Control Group.

Caterpillar Information System:

1986/12/22 New Oil Level Gauges (Dipsticks) With "Full Range" Used{1326}

1986/12/22 Fuel Dilution Troubleshooting Procedure{1250}

1986/12/22 Use Heli-Coils To Repair 5.4" Bore Engine Rocker Arm Assemblies{1123,1105}

1986/12/22 Engine Power Increased{1250}

1986/12/22 Two New Shop Towels And Towel Bracket Available In North America{0600}

1986/12/15 New Cover Used On BrakeSaver Control Valve{1159}

1986/12/15 Silicone Water Seal Available{1101}

1986/12/15 Avoid Oil Contact With New Water Passage Seals Used In Cylinder Head Groups{1100}

1986/12/15 Check For Dirt Before Replacing Pyrometer Switch{1050,7466}

1986/12/15 New Track Press Assembly Specifications Decals Available{4150}

1986/12/15 How To Use Literature References In Column Three of the NPR (Numerical Parts Record){0374}

1986/12/01 Improved Retaining Bushing In Fuel Injection Pump {1251,1250}

1977/01/17 Removal Of Bolts With Metal Locks Easier With New Sockets{0610}

1977/01/17 Improved Main And Connecting Rod Bearings Have Aluminum Alloy With More Strength{1230}

1977/01/17 Blades For Hose Saw Cut Off Group Must Now Be Sent To New Address To Be "Resharpened"{0664}

1977/01/17 New Special Instruction For Troubleshooting 5P2150 Engine Horsepower Meter{0651,1250}

1977/01/17 SIRS Component Code List{0331}

1977/01/17 New Tie Bars Improve Stability Of The Fuel Injection Test Bench{0652}

1977/01/17 New Flywheel Assemblies Are Available For Use With Spicer Transmissions{1156}

1977/01/17 New Water Temperature Regulator Has A Closer Fit At The Valve Seat To Keep Leakage At A Minimum{1355}

1977/01/24 Drain All Coolant From Engines Before Shipment For Remanufacturing{0355,1350}

1977/01/24 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings{1061}

1977/01/24 Exhaust Valve Guides With A Counterbore Are Now Available{1104}

1977/01/24 Adapter For Disassembly And Assembly Of Turbocharger Cartridge{0620,1053}