1980/01/07 Caterpillar


New Exhaust Valve For Special Engine Applications {1104,1105}

Usage:




D353, D379, D398, D399 Engines

Reference: This article is a revision of the article "New Exhaust Valve and Valve Guide" on Page 5 of the February 19, 1979, Service Magazine. Cancel the original article and use this information instead.

Description of Change: A new exhaust valve is available for the above engines used in special applications. The new valve is made of a different material for better heat resistance in conditions of high temperature operation. With the change of material, the stem of the new valve is not chrome plated (does not have a layer of chrome on the surface). For this reason, the new valve can be used with the standard valve guide; the special guide used with the former valve is not needed. The standard 8H7097 Exhaust Valve and 6N8847 Valve Guide (Exhaust) used for original factory installation are not changed.

Adaptable As: Direct replacement. For special applications, use the new 8N3723 Exhaust Valve and standard 6N8847 Exhaust Valve Guide in place of the former 4N6883 Exhaust Valve (which is canceled) and the special 2N5801 Valve Bushing (guide). The new valve is available only for parts service replacement in applications where high temperatures shorten valve service life.

Caterpillar Information System:

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}
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1980/01/07 Important: XT3 And XT5 Hose Assemblies Must Be Fabricated And Installed Correctly For Maximum Service Life {5057}
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 Improved Ring Seal Used At Rear Of Crankshaft {1161}
1980/01/14 Use The FT1481 Bracket To Hold The 1P2371 Micrometer In Position During Bore Size Measurement{0655,0663}
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}
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