1980/01/21 Caterpillar

New Piston Groups Have The Piston Pin Bore Off-Center, Away From The Thrust Side Of The Piston{1214}


D330C, 3304, D333C, 3306 Industrial and Marine Engines;
1673C, 3306 Truck Engines;
D7G, 627B Tractors;
627B, 637D Scrapers;
571G, 572G Pipelayers;
235 Excavators;
235 Front Shovels;
980B Loaders

Description of Change: New basic piston groups are used in rod and piston groups for the above models. The pistons used in the new piston groups have the piston pin bore moved off-center .06" (1.5 mm) away from the thrust side of the piston. This lowers the thrust loads so there is less vibration or movement of the cylinder liners, and less liner pitting. Formerly, vibration or movement of the cylinder liners caused liner pitting, especially during operation under heavy load conditions.

Adaptable As: Direct replacement. For engines equipped with keystone-type piston rings, use the new *9N5404 Piston Group (Basic) in place of the former 9N1303 Piston Group (Basic), which is canceled. For engines with rectangular cross section piston rings, use the new **9N5251 Piston Group (Basic) in place of the former 4N9258 Piston Group (Basic), which is canceled. Check the engine arrangement and parts book to see which piston group is needed. The new and former pistons can be mixed in the same engine; it is not necessary to install a complete set of new pistons. The piston rings used in each of the piston groups are not changed.

*Not available as a group. Order 9N5403 Body Assembly and 9L6935 Ring Group.

**Not available as a group. Order 9N5250 Body Assembly and 9S3068 Ring Group.

Caterpillar Information System:

1980/01/21 A Spring With A Lower Rate Is Now Used In The Fuel Filter Group To Give Less Fuel Pressure{1261}
1980/01/14 New Raw Water Engine Oil Cooler Is Used{1378}
1980/01/14 Use The FT1481 Bracket To Hold The 1P2371 Micrometer In Position During Bore Size Measurement{0655,0663}
1980/01/07 Improved Ring Seal Used At Rear Of Crankshaft {1161}
1980/01/07 8N1831 Fuel Nozzle Assembly Now Approved For Use In 1693 Truck Engine; Chart For Applications Of 8N1831 And 7N5005 Fuel Nozzle Assemblies {1254}
1980/01/07 Important: XT3 And XT5 Hose Assemblies Must Be Fabricated And Installed Correctly For Maximum Service Life {5057}
1980/01/07 New Exhaust Valve For Special Engine Applications {1104,1105}
1980/01/07 Fuel Heaters Are Now Available For Field Installation {1296}
1980/01/07 Do Not Use 5B1161 Wire To Check Main Bearing And Connecting Rod Bearing Clearances; Use Plastigage {0653,1203,1219,1230}
1980/01/07 Three New Pressure Gauges Are Now Available {0651}
OPERATING ENVIRONMENT-AND ITS EFFECT ON SR4 GENERATORS Operating Environment - And Its Effect On SR4 Generators
C4.4 Industrial Engine and C4.4 Engine for Genset Electrical System - (Interactive) C4.4 Industrial Engine and C4.4 Engine for Genset Electrical System - (Interactive)
1980/01/21 Cooling System Improvements Prevent Expansion Tank Leakage{1354,1380,1153}
1980/01/21 Extended Shafts Now Available For Front Power Takeoff Units{3055}
1980/01/21 New Fuel Injection Nozzle Assembly Used{1254}
1980/01/28 New 6V199 Socket For Use On Fasteners In Areas With Limited Clearance{0612}
1980/01/28 Installation Procedures For 5N5880 Remote Shut-Off Group And 5N6336 Oil Pressure Indicator Gauge Group{7418,7403,7455}
1980/01/28 New Attachment Air Compressor Group and Lines Groups Have Improved Design{1065}
1980/01/28 Oil Drain Hole Added To Spacer Plate Cylinder Block To Permit Use Of Scroll Fuel System{1201,1221}
1980/02/04 New Cylinder Liner Has Improved Design To Keep Liner Temperatures Lower{1216}
1980/02/04 Change To Gear On Accessory Drive Shaft Assembly Gives Longer Service Life{1207,1206}
1980/02/04 Real Value Available Through Caterpillar Remanufacturing Programs{0374}
1980/02/11 Warning: Avoid Use Of Fuel Mixtures Of High Volatility. If You Are Exposed To Such Mixtures, Be Aware Of The Hazards Involved And Take Proper Precautions{1280}
1980/02/11 Use The Correct Water Temperature Contactor{1350,1100}
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