1983/04/04 Caterpillar

New Connecting Rod Bearings Used{1219,1230}

Usage:

3400 Series Engines

Description of Change: New connecting rod bearings are now used in the rod and piston groups on 3400 Series Engines, as shown in the chart. The new bearings are a different design, which uses a copper material to bond (fasten) the lead-tin overlay to the aluminum bearing material. This copper material will decrease the possibility of scuffing after the lead-tin overlay is worn away.

Formerly, a nickel material was used to bond the overlay to the aluminum bearing material.

Adaptable As: The new 1W7524 Bearing is a direct replacement for the former 8N5426 Bearing. The new bearing is in effect with the serial numbers shown in the chart. Our recommendation is to use the new bearings in these models when a replacement is made.

Location of copper material in the bearing.

Caterpillar Information System:

1983/04/04 Use The 6V5000 Infrared Thermometer Group To Measure Temperatures{0651}

1983/04/04 New Washer And Bolts Keep Fan Drive Tight{1359}

1983/04/04 Labyrinth-Type Seal Ring Available For Rear Power Takeoff{3055}

1983/04/04 Oil Passage Plugs Are No Longer Installed In Crankshafts For Parts Service{1202}

1983/04/04 New Seal Used In Yoke Group{1165,1207}

1983/04/04 Improved Valve Springs Available{1108}

1983/03/21 New Turbocharger Inlet Tube Assembly And New Seal Available{1059,1061}

1983/03/21 FT1588 Cover Storage Rack{0634}

1983/03/21 New Shutoff Solenoid Group Used{1259}

1983/03/21 Application Of Labels To Plastic Tool Cases{0630}

1983/03/14 Change Made To 6V3032 Deluxe Test Lead Kit{0651}

1983/03/14 Brake Wear Can Be Checked{4267,4255,0653}

1983/04/18 Machine Available To Balance Turbochargers {0650,1052,1053,1077}

1983/04/18 New O-Ring Seals Used On Cover For Auxiliary Start Connector {1401,1402}

1983/04/18 New Oil Cooler Core Can Be Removed For Field Service {1365,1366,1375,1376}

1983/04/18 Protection Of Electric System For Machines Used In Corrosive Applications {1400}

1983/04/18 Lugs And Setscrews Now Used To Prevent Movement Of The Circle Drive Housing {5207}

1983/04/18 New Special Instruction Available For 6V4135 Halogen Leak Detector {0651}

1983/04/18 Use Of 9S3265 Retaining Compound On AiResearch Turbocharger Compressor Wheel Retainer Nuts {1052,1053}

1983/04/18 Use Pneumatic Tool To Remove Gaskets, Sealants, Paints {0610}

1983/04/18 Repair Kit For Diesel Fuel Heater Available {1296}

1983/04/18 Pistons With Thicker Top Rings Must Be Used In Correct Applications {1214,1215}

1983/04/18 Cutting Threads For Caterpillar Taperlock Studs {7553}

1983/04/18 SIRS Index Contains Product Update Information {7570,0374}