New Crankshaft Main Bearings Used{1203}
Usage:
All 3408 And 3412 Engines
Description of Change: New crankshaft main bearings are now used on all 3408 and 3412 Engines. The new bearing has a different aluminum alloy layer under the lead-tin overlay. This new aluminum layer permits a longer service life after the overlay has been worn away.
Adaptable As: The new 1W6589 Main Bearing is a direct replacement for the 8N5421 Main Bearing on these engines.
The new bearing is in effect with the serial numbers shown in the chart.
Caterpillar Information System:
1982/05/10 New Exhaust Tubes And Support Used{1061,1067}
1982/05/10 Bolts Now Used Instead Of Studs To Hold Cylinder Heads{1101,1201}
1982/05/10 Larger Press And Improved Tooling Now Available To Fabricate XT Hose{0623,0624,0664}
1982/05/03 Inspection Marks On Bearings{7551,1230,1226,1203,1219,1227}
1982/05/03 Use 6V6018 Skiving Vise To Hold XT Hose Assemblies{0623,0626,7554}
1982/05/03 Use The Correct BrakeSaver Seal Group{1155}
1982/05/03 Use New 6V4910 Clamp-On Ammeter For Easier Electrical Current Measurement{0651}
1982/05/03 Lubricant Recommendations Changed For All Caterpillar Engines To Combat Effects Of Fuel Sulfur{1318,0375,0374,1280}
1982/05/03 New 6V4950 Injection Line Speed Pickup Group Used With 6V2100 Multitach{0651}
1982/05/03 Use New Special Instruction To Install 5P6595 Insert In Cylinder Liner Seats{1216,0621}
1982/05/03 6V4960 AC Current Probe Will Measure Current Easier{0652}
1982/04/26 Expansion Tank Changed To Permit Installation Of Water Level Gauge{1354,7470}
1982/05/10 New Mounting Bracket For Mechanical Shut-Off Cable{7418}
1982/05/10 5P4812 Gauge Group Components Available Separately{0653,1215}
1982/05/10 5P3519 Gauge Group Components Available Separately{0653,1215}
1982/05/10 Be Sure To Use Correct Water Temperature Regulators{1355}
1982/05/10 Fuel Rack Slots Have Improved Wear Resistance{1257}
1982/05/10 Two-Piece Guard For Alternator Fan And Belts{1400}
1982/05/17 Holes Added To Water Pump Impeller{1361}
1982/05/17 Wrong Water Separator Element Will Not Remove Water{1263}
1982/05/17 Larger Studs Can Be Used With Rear Exhaust Manifolds{1059}
1982/05/17 Improvements Made To 6V3000 Sure Seal Repair Kit{0611,1408}
1982/05/17 Fuel Ratio Control Is Now Available As A Group{1278}
1982/05/24 New Auxiliary Pump Group Operates At A Slower RPM{1371}