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.