New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump
Usage:
3408 Truck and Industrial 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:
1978/02/08 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing
1978/02/08 Probable Causes Of Low Fuel Delivery During Testing On Fuel Injection Test Benches
1978/02/08 New Water Temperature Regulator Opens At 180 °F (82°C){1350,1355,7304}
1978/02/08 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group
1978/02/08 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System
1978/02/08 Do Not Change Factory Fuel Or Speed Settings On Truck Engines Unless New Settings Are Certified Under Applicable EPA Regulations
1978/02/08 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups
1978/01/18 Improved Gasket Prevents Oil Leakage From The Governor
1978/01/18 5P8665 Cylinder Liner Puller Makes Liner Removal Easier And Faster
1978/01/18 Turbine Housing For Turbocharger Is Stronger
1978/01/18 Tolerance Added To Valve Clearance Specifications
1978/01/18 Inner Member Of Caterpillar Coupling Must Be Restrained If The Connection To The Inner Member Is Removed
1978/02/08 Smaller Quantity Of Oil Now Used In Engine Oil Pan; Prevents Contact Between Crankshaft And Oil
1978/02/08 Stronger Front Support Assembly
1978/02/08 Successful Engine Service-3208 Engine Booklet Is Available
1978/02/08 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal
1978/03/01 Replacement Seals And Wear Sleeves Now Available As A Crankshaft Seal Kit
1978/03/01 Modification Of Oil Pan For Installation Of Oil Sump Heater
1978/03/01 Stronger Exhaust Manifold Gasket Now Used
1978/03/01 Use Again Specifications For Valve Springs Are Changed
1978/03/01 New Tachometer Drive Adapter Assembly Prevents Failure Of The Seals For The Tachometer Drive Group And Transfer Pump
1978/03/01 List Of Service Publications
1978/03/01 New Starter Motors Have Solenoid On Top Of Starter
1978/03/01 Replacement Seal Group For Water Pump Impeller Now Has All The Seal Parts Plus An Installation Tool