1980/01/07 Caterpillar


Improved Ring Seal Used At Rear Of Crankshaft {1161}

Usage:




D8K, D9H And DD9H Tractors;
583K And 594 Pipelayers;
D353C, D353D, And D353E Industrial And Marine Engines;
and G342C Natural Gas Engines

SUPPLEMENT: 01/28/80

SERVICE MAGAZINE, JANUARY 7, 1980, PAGES 7 & 8. In the article "Improved Ring Seal Used At Rear Of Crankshaft" change the first sentence in the paragraph "Description of Change" to read: A new ring seal with a V-groove and step ends is used at the rear of the crankshafts for the above engine models.

Also, change the paragraph "Adaptable As" to read: The new 8N6079 Seal can be used as a direct replacement for the former 7S662 Ring in all applications.

The above revisions are made because the 7S662 Ring is still used at the factory in the tractor and pipelayer models shown, but the new 8N6079 Seal can be used for service replacement.

--------------- END SUPPLEMENT ---------------

Description of Change: A new ring seal with a V-groove and step ends is used at the rear of the crankshafts for the above models. This V-groove design permits an even distribution of spring force for an improved seal. Formerly, a ring seal with a U-shape groove was used. This design did not give an even distribution of spring force and some times permitted leakage.

Adaptable As: The new 8N6079 Seal is a direct replacement for the 7S662 Ring which is canceled.


Cross sections of new and former ring seals.

Caterpillar Information System:

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1980/01/07 New Exhaust Valve For Special Engine Applications {1104,1105}
1980/01/07 Fuel Heaters Are Now Available For Field Installation {1296}
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1980/01/14 New Raw Water Engine Oil Cooler Is Used{1378}
1980/01/21 A Spring With A Lower Rate Is Now Used In The Fuel Filter Group To Give Less Fuel Pressure{1261}
1980/01/21 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}
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