1996/02/26 Caterpillar

Troubleshooting Information For Horton Diesltemp© Fan Clutches{1359}

Usage:

3406C (5KJ, 3ZJ, 4CK, 8PN),
3406E (5EK) Truck Engines

The Horton Diesltemp Air Operated Fan Clutch is an OEM option that can be ordered on the above engines. After April 7, 1995, The Horton Diesltemp Air Operated Fan Clutch has a patented "System Sentry," which consists of a plug that melts when the engine overheats. The plug, which is located on the outer surface of the piston friction disc, acts as a thermal fuse. If the fan clutch slips, heat will build up at the outer edge of the piston friction disc and work its way toward the center of the fan clutch. When sufficient levels of heat reach the "System Sentry," the center of the plug melts. This allows air pressure in the fan clutch to drop, disengaging the fan clutch immediately. This air leak will not significantly impact the rest of the vehicle air system.

The defective fan clutch can be detected by the sound of air being released after the engine is shut down.

NOTE: Do not replace electronic parts, hoping to solve the engine overheating problem.

NOTE: For more troubleshooting information, Reference:

Horton Industries, Inc, form numbers L-22459-A-0595 and L-22537-0795IP, available from Horton Industries Inc. Phone 1-800-621-1320.

Caterpillar Information System:

1996/02/26 New Oil Pan Resists Cracking{1302}

1996/02/26 Modification For 9U-7256 Guide Assembly (Camshaft){1210,0701,0702,0703}

1996/02/26 New Material Used In O-Rings And Optional New Block Side Cover Replacement{1201}

1996/02/26 New Engine Cylinder Head Injector Sleeve Used In Both Mechanical Unit Injection (MUI) And Hydraulic Electronic Unit Injection (HEUI) Engines{1125}

1996/02/26 Lubricant Used On Cylinder Head Bolts Changed{1100}

1996/02/26 Fuel Injector Sleeve Replacement Tooling{0703,1125}

1996/02/26 New Engine Information Plates Require More Information{1000}

1996/01/23 Basic Electronic Troubleshooting Guide Is Now Available{1900}

1996/01/23 False Logging Of Engine Retarder Diagnostic Codes{1900,1901,1119}

1996/01/23 Corrupted Fleet Trip Data{1900}

1996/01/23 Remanufactured Product Update{7754}

1996/01/23 Governor Spring Guide Press Depth{1287,1284}

1996/02/26 Engine Coolant Loss And/Or Overheating Can Be Caused By Incorrect Shunt Line Connection{1380}

1996/02/26 New Speed/Timing Sensor {1912}

1996/03/27 Possible Sources of High Crankcase Blowby From Breather Tube{1317}

1996/03/27 New Jake Brake Slave Piston Lash Setting{1119}

1996/03/27 False Logging Of Cylinder Fault Codes While Using The Engine Retarder{1900,1901,1119}

1996/03/27 Uprateability Improvements{1902}

1996/03/27 Personality Module Covers On Electronic Control Modules (ECM'S){1902}

1996/03/27 Electronic Changes And Features{1901}

1996/03/27 Camshaft Conversion Kits Available{1110}

1996/03/27 Improvements To Camshafts, Unit Injector Rocker Arms, And Valve Rocker Arms{1123,1210}

1996/03/27 Fuel Injection Pump Barrel Sealing Face Reconditioning{1251}

1996/03/27 Fuel Injection Nozzle Reference {1254}