New Exhaust Valve Has Improved Three-Piece Construction{1105}
Usage:
1673 (74B, 78B, 83B) Truck Engines;
D346, D348, D349, D353, D379, D398, D399 Engines In All Applications
Description of Change: A new exhaust valve is used in the above engines. The new valve has a three-piece construction in comparison with the two-piece construction of the former valve. The stem of the new valve is not changed, but the valve head is now made of a special steel with a stellite face for the valve seat. Formerly, the complete head of the valve was a stellite casting. The new design has wear and seat face characteristics similar to the former design, but is not as easily damaged during storage and installation.
Adaptable As: Direct replacement as shown in the chart.
Caterpillar Information System:
1979/04/09 Serial Numbers Used Instead Of Test Numbers On Power Shift Transmissions{3150,7557}
1979/04/09 Conversion Group Available To Install Woodward Governor On Engines Equipped With Mechanical Governor{1264}
1979/04/09 6V112 Repair Kit Available For Parts Service Of The 8H8558 Nut Spinner{0611}
1979/04/02 Stronger Output Shaft Now Used In 2N3909 Tachometer Drive Adapter{7462}
1979/04/02 Improved Fuel Priming Pumps Give Longer Service Life{1258}
1979/04/02 New Pistons And Timing Advance Unit Give Better Emissions Control And Easier Starts{1214,1272}
1979/04/02 A 6V198 Container Kit Is Available To Repair The 5P6225 Transmission Hydraulic Test Group{0651}
1979/03/26 FT1441 Drawing Available To Fabricate A Seal Installer For The 5P7143 Duo-Cone Seal Group{0622}
1979/03/26 A Reverse Connection Of Oil Filter Hoses Can Cause Bearing Failures{1230,1307,1306}
1979/03/26 Four Crankshaft Rear Seals Are Available For Use On 3304 And 3306 Engines{1161}
1979/03/26 6V852 Dust Cap Is Available For Protection Of 5P9711 And 5P9714 Nipple Assemblies{0651}
1979/03/26 Replacement Bushing Available For Cast Iron Rocker Arms Only{1102}
1979/04/09 During Installation Of Crankshaft Piston Ring Seals, Put Silicone Grease In The Groove And On The Seal{1160,1161}
1979/04/16 Testing And Adjusting Procedure For 5P4210 Modular Cab Tilting Cylinder And Valve{0620}
1979/04/16 How To Extend The Service Life Of 1P5550 Fuel Cam Locking Tool Assembly{0654,1250}
1979/04/16 90° Elbows On Quick Disconnect Couplers Make Installation Easier{0690}
1979/04/23 Careful, Correct Installation And Maintenance Of Fuel Injection Lines Is Very Important To Prevent Possible Engine Damage, Fire And Other Problems{1252}
1979/04/23 New Oil Cooler Bonnets Used On 3408 And 3412 Engines{1378,1354,1380}
1979/04/23 Inspection Of Oil Pump After Long Periods Of Service Can Prevent Engine Damage{1304}
1979/04/23 Dowtherm Test Strips No Longer Available{0651,1350}
1979/04/30 New " Drive 6V94 Universal Joint Is Available{0612,1253}
1979/04/30 2P8316 Dowel Now Available For Parts Service{0652}
1979/04/30 The Service Life Of A Power Shift Transmission Is In Direct Relation To The Maintenance Of Its Lubrication System{3004,3179,3150}
1979/04/30 New Ring Gears Used In Flywheel Assemblies{1158}