Improved Crankshaft Main Bearing With Higher Strength Aluminum Alloy{1203}
Usage:
D346, D348, D349, G348, G349 Engines;
641, 641B, 650, 650B, 651, 651B, 657, 657B, 660, 660B, 772 Tractors;
773, 777 Trucks;
992, 992B Loaders
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:
1977/01/31 New Disconnect Switch Assembly Has Better Resistance To Corrosion{1411}
1977/01/24 Lightening Holes Not Drilled In Some Crankshafts{1202}
1977/01/24 New Cylinder Liners{1216}
1977/01/24 Coupling With A Slip Fit Now Used At Turbocharger Exhaust Outlet Instead Of Coupling With Piston Rings{1061}
1977/01/24 Same Valve Camshaft Assembly Used On Direct Injection Engines Now Used On Engines That Have Precombustion Chambers{1210}
1977/01/24 Adapter For Disassembly And Assembly Of Turbocharger Cartridge{0620,1053}
1977/01/24 Exhaust Valve Guides With A Counterbore Are Now Available{1104}
1977/01/24 Exhaust Manifold Coupling With A Slip Fit Now Used Instead Of A Coupling With Piston Rings{1061}
1977/01/24 Drain All Coolant From Engines Before Shipment For Remanufacturing{0355,1350}
1977/01/17 New Water Temperature Regulator Has A Closer Fit At The Valve Seat To Keep Leakage At A Minimum{1355}
1977/01/17 New Flywheel Assemblies Are Available For Use With Spicer Transmissions{1156}
1977/01/17 New Tie Bars Improve Stability Of The Fuel Injection Test Bench{0652}
1977/01/31 New Remote Control Switch Assembly For Electric Hydraulic Pumps{0621,0623}
1977/01/31 Transportation Notice Plate Is No Longer Needed For Pressurized Nitrogen Cylinders{7557}
1977/01/31 Low Emission Truck Engines With Exhaust Gas Recirculation (EGR) Systems{1050}
1977/02/14 Correct Use Of Plugs In Drain Holes Of Hydraulic Pumps That Have Two Seals On The Shaft-Use A Plug In Drain Hole Except With Water Glycol Systems{5055,5073}
1977/02/14 New 5P7307 Engine Turning Tool Group Fits All Engines{0611}
1977/02/14 Test Used Fuel Nozzles Before You Install New Nozzles; Tips On Test Procedures{1254,0651,0336}
1977/02/14 Diesel Fuel Recommendation Expanded{1280}
1977/02/28 Modification To Holder To Machine Counterbore On Cylinder Block{0664,1201}
1977/02/28 Hardened Washers Now Used Between The Bolt Heads And The Engine Front Support To Keep These Bolts Tight{1153}
1977/02/28 Clip Now Used To Hold Coolant Line For The Turbocharger{1052,1380}
1977/02/28 Lock Now Available For Connecting Rod Bolt Used In TU-FL0501 Air Compressor{1065}
1977/02/28 Improved Exhaust Valve Now Available{1105}