Improved Front Pulley And Damper Groups Use New Damper Adapter With Larger Diameter Bolt Circle For Pulley Bolts{1205}
Usage:
3406 Industrial and Marine Engines;
3408 Industrial Engines
Description of Change: New front pulley and damper groups for 3406 and 3408 Industrial Engines use a new damper adapter and pulley (or pulleys) with a larger diameter bolt circle for the pulley mounting bolts. This lowers the bolt stresses caused by heavy belt loads, especially on pulleys that have grooves for several belts. Formerly, heavy belt loads in some conditions caused enough stress to break the pulley near the mounting bolts.
The new damper adapter is also used in the pulley and damper group for 3406 Marine Engines, and in the front power take off (clutch) group for 3406 Industrial Engines.
Adaptable As: Direct replacement when the necessary parts are used together.
Caterpillar Information System:
1978/01/09 Improved Water Shield For Exhaust Manifold{1067}
1978/01/09 Inner Member Of Caterpillar Coupling Must Be Restrained If The Connection To The Inner Member Is Removed{3252}
1978/01/09 5P8665 Cylinder Liner Puller Makes Liner Removal Easier And Faster{0621,1216}
1978/01/09 Improved Seal Used Between Impeller And Bearings On Water Pump Shaft{1361,1371}
1978/01/09 Service Tip: Use Caution When Hydraulically Operated Implements Must Be Lifted With A Hoist While The Engine Is Stopped{5050}
1978/01/09 Improved Water Pump Group Now Used{1361}
1987/12/21 New or Updated Drive Train Information Available In Guidelines For Reusable Parts{0374}
1987/12/21 New Gerotor Pump Group Used In 3161 Governors{1264}
1987/12/21 New Suction Bell Assemblies, Bolts, And Washers Used In Sump Oil Lines Groups{1307,1315,1304}
1987/12/21 Check Screen Assembly In Fuel Transfer Pump Inlet If Low Fuel Pressure Is Experienced{1256}
1987/12/21 Improved VR3 Voltage Regulator Available For Earlier Generators{4474}
1987/12/14 Earlier Flywheel Housings Can Be Modified For Use With Later Crankshafts{1157,1202}
1978/01/16 Tolerance Added To Valve Clearance Specifications{1105,0374}
1978/01/16 New Turbine Housings Are The Replacement For Three Former Turbine Housings Used On Schwitzer Turbochargers{1052}
1978/01/16 Turbine Housing For Turbocharger Is Stronger{1052}
1978/01/16 Improved Gasket Prevents Oil Leakage From The Governor{1264}
1978/01/23 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal{1265,1269}
1978/01/23 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups{1264,1278,1286}
1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}
1978/01/30 Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}
1978/01/30 New Water Pump Cover Has A Baffle And Wall To Send Coolant Flow From Bypass Line Directly Into Water Pump{1361}
1978/01/30 Stronger Front Support Assembly{1153}
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}
1978/02/06 Smaller Quantity Of Oil Now Used In Engine Oil Pan; Prevents Contact Between Crankshaft And Oil{1318}