1980/12/01 Caterpillar

Larger Plug Used In The Ends Of The Rocker Arm Shaft Assembly{1102}

Usage:

All 3408 Engines

Description of Change: A larger plug is now used in the ends of the rocker arm shaft assembly for all 3408 Engines.

A different tube stock, which has a larger inside diameter, is used to make the rocker arm shafts. Because of the larger inside diameter of the tube stock, the diameter of the counterbore in the shaft was increased. The larger diameter counterbore makes a larger plug necessary.

Adaptable To: The L1022 Plug can be installed in the rocker arm shafts with the larger, 16.66 ± 0.03 mm (.656 ± .001") diameter counterbores. The 5B1866 Plug is still available for use in rocker arm shafts that have the smaller 15.98 ± 0.03 mm (.629 ± .001") diameter counterbores.

Location of the L1022 or 5B1866 Plug in the ends of the rocker arm shaft assembly.

Caterpillar Information System:

1980/12/01 Exhaust Manifold And Air Lines Groups Changed To Prevent Exhaust Leakage And Damage To Manifold Gaskets And Mounting Studs{1059,1061}

1980/12/01 Direct Inquiry Service Information Retrieval System (SIRS) Available To U.S. And Canadian Dealers{0374}

1980/11/24 Replacement Wheel Available For Service Of 6V97 Engine Stand Group{0626}

1980/11/24 New Aftercooler Core Has Copper-Nickel Tubes For Increased Strength{1063,1064}

1980/11/17 Some Remanufactured 3406 Engines Have The Wrong Reference Serial Number On The Identification Plate{7557,1000}

1980/11/17 Use Dust Cap To Prevent Freon Leakage From Air Conditioner; Cap Is Available As Replacement Part{7320}

1980/11/17 New Exhaust Manifold Group And Air Lines Group Used To Prevent Exhaust Leakage{1059,1061}

1980/11/17 6V4021 Piston Ring Compressor Group Available{1215,1214,0622}

1980/11/17 Two Thinner Spacers Available For Use During Adjustment Of Off-Engine Timing Dimension{1251,0653}

1980/11/17 Coolant Conditioner Elements Are Now Available For 3208 Engines{1350}

1980/11/17 Check For Correct Spring Retainer On Oil Pump Bypass Valve When Oil Pan Is Removed{1315,1302}

1980/11/10 Wrong Installation Of Washers Between Bearing Cone And Bearing Retainer Nut Can Cause Directional Clutch Damage{3155,3159,3176}

1980/12/01 New Service Handle Kit Permits Cab Door To Be Opened From Inside While Locked (Fastened With Lock){7308,7301}

1980/12/01 Check Alignment Of Engine Flywheel And Torque Converter Input Shaft After Flexible Coupling Failures; Also Check Low Idle RPM{3252,1156,3101}

1980/12/01 Warning: Use Correct Seal On Seat Assembly For Valve Group In Steering Valve Group{4307,4312,4322}

1980/12/01 New Front Housing Assembly And Gaskets Used{1162,1166,1151}

1980/12/01 Different Water Temperature Regulators Used In Water Lines Groups{1355}

1980/12/01 Different O-Ring Seal Now Used On The Oil Pump Suction Tube{1307,1304}

1980/12/01 Inspect All Engine Oil And Fuel Filter Elements Before Installation{1000,1261,1318}

1980/12/01 6V4085 Torque Multiplier Group Available{0614}

1980/12/01 Oversize Brake Lining Kit Now Available For Front Wheel Brakes{4254}

1980/12/15 New Bearing Sizes And Identification Codes For AiResearch Remanufactured Turbocharger Cartridges{1053}

1980/12/15 Be Sure To Cut The Center Gasket Even With Top Surface Of Oil Pan Sections To Prevent Oil Leakage{1302}

1980/12/15 Replacement Timing Belts And Variable Belt For Fuel Injection Test Benches Available From Caterpillar{0652,1250}