1978/01/18 Caterpillar

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

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:

1978/01/18 Improved Water Shield For Exhaust Manifold

1978/01/18 Improved Front Pulley And Damper Groups Use New Damper Adapter With Larger Diameter Bolt Circle For Pulley Bolts

1978/01/18 Maintenance Instructions For Coolant Conditioner Elements

1977/12/14 Add Chamfer To Cartridge Assembly Bearings To Prevent Oil Leakage

1977/12/14 Excessive Oil Consumption Can Be Caused By Dirt In Air Inlet System Or By Flaking Of The Piston Compression Ring

1977/12/14 Water Separators Needed On Engines In The Field With SMFS

1977/12/14 List Of Service Publications

1977/12/14 New Coolant Tube And Regulator Housing Used With Water Cooled Exhaust Manifold Gives More Clearance For Hooks To Lift The Engine

1977/12/14 Separate Parts Of Oil Pump Cover Now Available

1977/12/14 Improved Mounting Base For Air Compressor

1977/11/30 New Fuel Injection Valve Assembly Has Improved Internal Components

1977/11/30 New Oil Filter Base Has Reinforcement Around The Center To Prevent Possible Cracks

1978/01/18 Improved Water Pump Group Now Used

1978/01/18 Improved Seal Used Between Impeller And Bearings On Water Pump Shaft

1978/01/18 List Of Service Publications

1978/01/18 Valve Damage Can Be Caused By Short Intervals Of Engine Operation In Very Cold Temperatures

1978/01/18 Inner Member Of Caterpillar Coupling Must Be Restrained If The Connection To The Inner Member Is Removed

1978/01/18 Tolerance Added To Valve Clearance Specifications

1978/01/18 Turbine Housing For Turbocharger Is Stronger

1978/01/18 5P8665 Cylinder Liner Puller Makes Liner Removal Easier And Faster

1978/01/18 Improved Gasket Prevents Oil Leakage From The Governor

1978/02/08 Change In Design Of Engine Governor, Fuel Injection And Transfer Pump Groups, And Fuel Ratio Control Groups

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 Attachment Groups Put Corrosion Inhibitor Directly Into Cooling System