1989/03/20 Caterpillar

Improved Magnet Used In Rack Assembly{1705,1286}

Usage:

3406B (PEEC) Truck Engines ( 8TC)

Description of Change: The magnet on the end of the rack assembly in the fuel injection pump group has been improved. See Illustration 1. The epoxy in the former magnet could soften and flow from around the magnet. See Illustration 2. This could cause the rack sensor to loose contact with the rack which causes a Fault Code 22 (rack position fault). The improved magnet contains a different epoxy (red in color instead of the former black). The red epoxy will not soften and flow out of position.

Illustration 1. Location of the 7W7819 Magnet in the 4W3942 Fuel Injection Pump Group.

Illustration 2. Cross section of 7W7819 Magnet.

Adaptable To: The improved 7W7819 Magnet is part of the 4W2618 Regulator Rack Assembly in the 4W3942 Fuel Injection Pump Group used on 3406B (PEEC) Truck Engines. The part number of the improved magnet has not changed.

Caterpillar recommends replacing the former magnet (with the black epoxy) with an improved magnet (with red epoxy) whenever repairs are needed. The threaded shaft of the magnet is 2.1 mm (.08") in diameter. Use care not to break the shaft when removing or installing the magnet on the end of the rack.

Caterpillar Information System:

1989/03/20 Elbow Fitting Available To Allow "Quick-Drain" Line To Oil Pan{1302,1307}

1989/03/06 New Bleed Screw Used On 7000 Series Fuel Injection Nozzles{1254}

1989/03/06 New Engine Wall Charts Give Maintenance Management Recommendations{0374,0375,7500,7557,7580}

1989/03/06 High Horsepower Standby Generator Set Engines{1000}

1989/02/27 Troubleshooting 3406B (PEEC) Truck Engines Equipped With Power Demand Cruise Control (PDCC){1705}

1989/02/27 Updated 7X1830 SPM For 8T5282 3406B PEEC DDT Available{1707,1705}

1989/02/27 New Features And Enhanced Fault Codes Available In New PEEC Personality Modules{1707,1705}

1989/02/27 Surface Marks On Roller Bearing Cages Are Not Cracks{7551}

1989/02/20 New Gasket Replaces O-Ring Seal On Manual Valve Group And Plug Group Used For Testing Cylinder Pressure{1101}

1989/02/20 Part Numbers For Relays And Clip In Electronic Modular Control Panel{4450,4469,7451}

1989/02/13 Improved Valve Lifter Assemblies; Better Insert Retention{1112}

1989/02/13 New Nut In Fresh And Raw Water Pumps Has More Corrosion Resistance{1371}

1989/03/20 Correct Torque For Bolts That Fasten Pulley To Stub Shaft In Radiator Group{1350}

1989/03/27 Limitations On Engine Cranking Time{1453,1401}

1989/03/27 Understanding "Shorts," "Opens" and "Intermittents"{1400}

1989/03/27 Understanding Causes Of Blown Fuses And Tripped Circuit Breakers{1400,1420}

1989/03/27 How To Troubleshoot A Short-To-Ground In Power Wiring{1400}

1989/03/27 Preventive Maintenance For Batteries{1401}

1989/03/27 Bolts Must Be Reinstalled In Same Holes In Companion Flange And Gear Output Flange{3305,3360}

1989/03/27 Exciter Rotor Retaining Bolt Torque Specification{4457}

1989/03/27 Additional Remanufactured Parts Available{1000}

1989/04/03 Follow Recommended Procedure When Adding Oil To Track Rollers And Idlers{4154,4159,4180}

1989/04/03 New Cylinder Blocks, Main Bearing Caps, And Main Bearing Cap Bolts Used{1201}

1989/04/03 Be Sure Electrical Components Are Correctly Grounded{1408}