1978/01/30 Caterpillar

Oil Strainer (Screen) Added To Turbocharger Thrust Bearing{1052,1053}

Usage:

D348 Vehicle Engines;
D349 Industrial, Marine and Truck Engines;
D353 Industrial and Marine Engines;
D379 Industrial Engines;
D398, D399 Industrial and Marine Engines;
3306, G333C, G342C, G348, G379, G398, G399 Natural Gas Engines;
641B, 650B, 651B, 657B, 660B, 666B, 772 Tractors;
773 Trucks Equipped With Schwitzer Models 4HD, V4HD, 4HF, 4MD, V4MD, and 4ME Turbochargers, and Earlier Models for Which These Are Used As a Replacement

Description of Change: A new thrust bearing assembly is used in turbocharger cartridges for the above models. The new bearing assembly has a strainer (screen) to keep foreign material out of the oil passage. Formerly, some bearings were damaged when the oil passage was closed by foreign material in the oil, especially particles of gaskets removed during service work.

Adaptable As: Direct replacement. The new 7N3762 Bearing Assembly can be installed in place of the former 2S1186 Thrust Bearing, which is canceled.

Caterpillar Information System:

1978/01/30 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures{1105,1208}

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 Design Of Governor Control Linkage Changed; Less Force Is Needed To Move The Accelerator Pedal{1265,1269}

1978/01/16 Improved Gasket Prevents Oil Leakage From The Governor{1264}

1978/01/16 Turbine Housing For Turbocharger Is Stronger{1052}

1978/01/16 New Turbine Housings Are The Replacement For Three Former Turbine Housings Used On Schwitzer Turbochargers{1052}

1978/01/16 Tolerance Added To Valve Clearance Specifications{1105,0374}

1978/01/16 Improved Front Pulley And Damper Groups Use New Damper Adapter With Larger Diameter Bolt Circle For Pulley Bolts{1205}

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}

1978/01/30 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}

1978/02/06 Successful Engine Service-3208 Engine Booklet Is Available{1000}

1978/02/06 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System{1350}

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}

1978/02/13 Complete Set Of Contact Points For Dial Indicators Is Now Available In One Group{0653}

1978/02/27 New Seal Assembly With Longer Ferrule Prevents Damage To Ferrule During Cylinder Head Installation{1100,1101,1300}

1978/02/27 Fabricated Adapters Permit Horizontal Mounting Of Transmissions On 1P2420 Transmission Repair Stand{0640}