1980/01/21 Caterpillar


A Spring With A Lower Rate Is Now Used In The Fuel Filter Group To Give Less Fuel Pressure{1261}

Usage:




D379 ( 68B5682-Up, 69B2020-Up ),
D398 ( 66B7439-Up, 67B2163-Up ),
D399 ( 35B4544-Up, 91B1105-Up ) Industrial and Marine Engines

Description of Change: A spring with a lower rate is now used in the relief valve in 7N8853 Fuel Filter Group on D379, D398 and in 7N8867 Fuel Filter Group on D399 Industrial and Marine Engines.

The new spring gives a pressure of 30 psi (205 kPa) which is correct according to the specifications. The former spring gave a pressure of 36 psi (250 kPa).

Adaptable To: The new 5N5337 Spring can be installed in place of the former 5B6578 Spring used on D379, D398 and D399 Engines which have the Serial Numbers shown above.

Caterpillar Information System:

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
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C18 Generator Set with EMCP3 Electrical System 276-4751 C18 Generator Set with EMCP3 Electrical System 276-4751
1980/01/21 New Piston Groups Have The Piston Pin Bore Off-Center, Away From The Thrust Side Of The Piston{1214}
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}
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