1978/01/16 Caterpillar

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

Usage:

D348, D349 and D353 Engines As Shown in the Chart

Description of Change: The Schwitzer turbocharger groups now have a divided turbocharger housing, a combination V-band/coupling bore exducer and a gasket between the turbine housing and the cartridge. The new turbine housings are a replacement for three former housings used on 4HD and 4HF turbochargers.

Adaptable To: The new turbocharger groups are a direct replacement for the former turbocharger groups.

NOTE: Technical Partsgram SEBD2021-01 "Turbocharger Information System, Turbocharger Assembly Identification" has a complete list of turbocharger assembly part numbers and their service replacement part numbers.

The new turbine housings, used with the new gasket, are a direct replacement for the former turbine housings.

Caterpillar Information System:

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}

1978/01/09 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}

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}

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}