New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}
Usage:
3408 Truck, Industrial and Vehicular Engines;
3412 Industrial Engines
Description of Change: A new water pump cover has a baffle and wall to control the direction of coolant flow. With the new cover, the coolant from the bypass line will flow directly into the water pump. Formerly, the flow from the bypass line mixed with the coolant in the radiator bottom tank and caused too much cooling action in some conditions. The new cover will improve control of engine temperatures, especially at low idle and/or in light load conditions, and improve performance of the cab heater if so equipped.
Adaptable As: Direct replacement. The new 9N3312 Cover can be installed in place of the former 6N931 Cover, which is canceled.
Caterpillar Information System:
1978/01/30 New Spring Used In Belt Tightener And/Or Fan Drive Groups{1358,1359}
1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}
1978/01/30 Electric Fuel Pressure Gauge Now Used{7456}
1978/01/30 Rectifiers And Fuses Added To Transmission Control Wiring Increase Switch Service Life{1408,3168,3172,3173,3174}
1978/01/30 Improved Electrical Wiring Has A Separate Fuse For Each Circuit{1408}
1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1978/01/30 Additional Parts Needed To Install 54 Winch On Tractors Equipped With Steel Fuel Lines On The Fuel Tank{5163}
1978/01/23 Stronger Guard Assemblies For Scraper Bowl{6201}
1978/01/23 New Torque Converter Has Several Improvements{3101}
1978/01/23 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups{1264,1278,1286}
1978/01/23 Rear Counterweights Are Now Made Of Steel{7056}
1978/01/23 Changes Made To Scraper Lubrication Films{7557,6229,6230,6239}
1978/01/30 Breather For Transmission Case Now Made Of Metal{3150}
1978/01/30 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations{0336,0337,1257}
1978/01/30 Retaining Ring Of A New Design Now Used In Torque Converter Group{3100}
1978/01/30 Air Line For Air Compressor Governor Now Connected To Outlet For Wet Air Tank{4272,1065,4278}
1978/02/06 Silicone Sealant Is Now Used To Keep Water Out Of The Steering Clutch Case{4059,4100,4106,4115}
1978/02/06 Adjustment Of Track Tension On Machines With One Carrier Roller Per Side{4150}
1978/02/06 Add New Measurement And Identification To FT904 Backlash Indicator{0653,3258}
1978/02/06 Stronger Clutch Housing Used In Variable Capacity Torque Converter{3102}
1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}
1978/02/06 New Water Temperature Regulator Opens At 180°F (82°C){1350,1355,7304}
1978/02/06 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches{0650,1250}
1978/02/13 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool{1361,0622}