Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy
Usage:
D346, D348, D349 Engines
Description of Change: Different crankshaft main bearings are now used in the above models. The aluminum alloy in the new bearings is of a higher strength. Also, the bond (method to fasten) between the aluminum alloy and the steel is stronger.
Adaptable As: Direct replacement.
The same change will be made in oversize and undersize parts service bearings as soon as possible.
Caterpillar Information System:
1977/01/28 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems
1977/01/28 Improved Main And Connecting Rod Bearings Have Aluminum Alloy With More Strength
1977/01/28 Same Valve Camshaft Assembly Used On Direct Injection Engines Now Used On Engines That Have Precombustion Chambers
1977/01/28 New Water Temperature Regulator Has A Closer Fit At The Valve Seat To Keep Leakage At A Minimum
1977/01/28 Lightening Holes Not Drilled In Some Crankshafts
1977/01/28 New Tie Bars Improve Stability Of The Fuel Injection Test Bench
1977/01/28 Removal Of Bolts With Metal Locks Easier With New Sockets
1977/01/28 What Is In The Microfilm Engine Bills Of Material?
1977/01/28 When Oil Mixes With Engine Coolant, Clean Cooling System And Install New Water Pump Seals
1977/01/28 New Cylinder Liners
1977/01/28 Exhaust Valve Guides With A Counterbore Are Now Available
1977/01/28 Adapter For Disassembly And Assembly Of Turbocharger Cartridge
1977/02/28 New 5P7307 Engine Turning Tool Group Fits All Engines
1977/02/28 Diesel Fuel Recommendation Expanded
1977/02/28 Drain All Coolant From Engines Before Shipment For Remanufacturing
1977/02/28 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings
1977/02/28 List Of Service Publications
1977/02/28 Improved Shut-Off Solenoids For Engines Equipped With Sleeve Metering Fuel Systems
1977/03/15 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor
1977/03/15 Clip Now Used To Hold Coolant Line For The Turbocharger
1977/03/15 Changes To Retainer Nut Torque And Assembly Procedures For Turbocharger Compressor Wheels
1977/03/15 Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight
1977/03/15 Improved Exhaust Valve Now Available
1977/03/15 Modification To Holder To Machine Counterbore On Cylinder Block