1990/12/10 Caterpillar

New Engine Magnetic Speed Sensor Used{1907}

Usage:

3406B (PEEC) Truck Engines

Description of Change: A new magnetic speed sensor with an improved design is used. The new magnetic speed sensor has a solid metal case over the sensing end to prevent the core from contacting the chopper wheel (the retainer on the fuel pump camshaft). Previously, the sensor core could come loose from the case. This allowed the sensing element to come in contact with the chopper wheel and cause the sensor to fail.

Adaptable To: The new 9X9655 Magnetic Sensor is a direct replacement for the former 6T6975 Magnetic Sensor (canceled) used in the improved 4W9599 Control And Housing Group. It is also a direct replacement for the 9X6844 Magnetic Sensor (canceled) used in certain 3406B (8TC10750-11150) PEEC Truck Engines. This change is effective with 3406B (8TC12737, 5YG1) PEEC Truck Engines, and is adaptable to first production.

Location of new sensor in 4W9599 Control And Housing Group.

Caterpillar Information System:

1990/12/10 Tools Available For Out-Of-Chassis Dynamometer Testing Of Electronic Engines{0781,1901,1913}

1990/12/10 New Rear Power Takeoff Clutch Plates Do Not Contain Asbestos{3055,3404}

1990/12/10 New 7E5085 Bushing Replaces Former 2M4314 Bushing In Fuel Injection Pump Groups{1251}

1990/12/10 Correct Handling And Replacement of 3T6962 Pressure Switch Assembly{7332}

1990/12/10 Correct Handling And Installation Of Temperature Switch Assemblies{1906}

1990/12/10 Improved 9W1077 Start Switch Assembly And 7N4160 Heat Start Switch Group{1416}

1990/12/10 New Caterpillar Warranty Statement For Ground Engaging Tools, SELF5138{6800}

1990/11/26 New Expansion Tank Used{1354}

1990/11/26 New Oil Pressure Sender Assembly Improves Accuracy Of Oil Pressure Indicator{7455}

1990/11/26 Use Status Screen On Electronic Control Analyzer Programmer (ECAP) When Checking The Calibration Of The Timing And Rack Sensors; Correction To Systems Operation, Testing & Adjusting for 3406B (PEEC) Diesel Truck Engine, Form SENR3485-01{1905,1911

1990/11/26 Service Tips For Piston Cooling Jets (Tubes){1331}

1990/11/26 New Air Compressor Crankshaft Has Improved Spline Lubrication{1803}

1990/12/17 Use The Marketing Publications Information Feedback Systems{0374}

1990/12/17 Remanufactured Camshafts And Cam Kits Available For Parts Service{1210,1211,1212}

1990/12/17 New Bronze Thrust Plate Used On Center Main Bearing Of Crankshaft Groups{1203}

1990/12/17 New Rotor Used In BrakeSaver Group; Regulator Valve Improved{1155}

1990/12/17 Personality Module Software Updated; Do Not Troubleshoot Diagnostic Code 55 (No Detected Faults){1901,1902}

1990/12/17 New Ether Starting Aid Groups Available{1456}

1990/12/24 Sealed Alternators Available For Earthmoving Applications{1405}

1990/12/24 Incorrect Specification For Tightening Turbocharger Compressor Nut In Service Manual For 3306B Diesel Truck Engine, SEBR0545-01{1052}

1990/12/24 Installation Of Zinc Rods In Caterpillar Marine Engines{1350,1388}

1990/12/24 Air Pressure Settings For Pneumatic Selector Control Valve On Reintjes® Marine Transmissions{3313}

1990/12/24 Update Information For Exhaust Manifolds{1059}

1990/12/24 New 3E0020 Vehicle Speed Buffer Used{1914,1900}