1986/12/01 Caterpillar

Improved Retaining Bushing In Fuel Injection Pump {1251,1250}

Usage:

3406B ( 2WB, 4TB, 6TB, 7FB, 70V ) Engines

Description of Change: A new fuel injection pump retaining bushing with a phosphate coating is now used on the above engines. The phosphate coating has a built-in lubricating quality that reduces friction. The coating will help maintain a constant load on the components at assembly. Previously, inadequate joint loading caused fretting on the surfaces between the bonnet and the plunger assembly. See illustration.

Location of components.

Adaptable To: The new 7C6617 Bushing is a direct replacement for the former 8N656 Bushing. The new 7C6617 Bushing can be identified by its charcoal black color. The former 8N656 Bushing had a gold color. Torque specifications for the new bushing is 230 ± 15 N·m (170 ± 10 lb. ft.), compared to 215 ± 15 N·m (160 ± 10 lb. ft.) for the former part.

Caterpillar Information System:

1986/12/01 Use Correct Pistons And Rings For 3406B Truck Engines {1214,1215}

1986/12/01 Hour Meters - Mechanical Versus Electronic {7480,7478}

1986/12/01 Product Support Literature For Military Machines {7567}

1986/11/24 Engine Mounts Available To Provide Clearance For Deep Oil Pans{1152,1302}

1986/11/24 Updates To The Parts Book Microfiche{0374}

1986/11/24 Smaller Diameter Fuel Supply Line May Cause Power Loss{1274,1250}

1986/11/10 Use Gas Detector Tubes That Have Expired Dates To "Break In" The Combustion Chambers For The Fuel Sulphur Analyzer Group{0651}

1986/11/10 Adjust Bosch Solenoid If Replaced Or Reinstalled{1407,1453}

1986/11/10 New Fuel Ratio Control Used{1278}

1986/11/10 Caterpillar Antifreeze Now Used And Available From Parts Departments{1350,1395}

1986/11/03 Nylon Seals Used On Lockwire To Seal Critical Areas; All Subsidiary Dealers Can Now Order Parts Service Seals {1257,1264}

1986/11/03 Two New Cold Weather Fuel Heaters Available {1296}

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

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

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

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

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

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

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

1986/12/22 Engine Power Increased{1250}

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

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

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

1986/12/22 New Torque Control Group Used In Governor And Fuel Injection Pump Group{1264}