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 6V4008 Valve Seat Extractor Now Available{1103,0622}

1980/11/24 New Gasket Improves Operation Of Shut-Off Groups{7418,7403}

1980/11/24 Use Fluid-Type Vibration Damper To Control Vibrations{1205,3305}

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

1980/11/24 New Decals Permit Easier Identification Of Fuel System Settings On Most Truck Engines{7557}

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 Tee-Test Plug And Pressure Tap (Connection) Plugs Can Be Tightened To A Higher Torque To Prevent Leaks{5050,0651}

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

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 New Front Housing Assembly And Gaskets Used{1162,1166,1151}

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}

1980/12/15 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 New Control Valve Group Used To Prevent Ratchet-Type Noise And Rough Clutch Engagement{3313}

1980/12/15 New Turbocharger, Turbocharger Oil Lines Group And Aftercooler Air Lines Group Used{1052,1058,1063,1307,1309}

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

1980/12/22 6V4019 Camshaft Pilot Group Is Available{0622,1210,1211,1201}

1980/12/22 Tires Are Filled With Nitrogen (N2){4203}