1982/03/08 Caterpillar

New Adapters And O-Ring Seals Used In Aftercooler Group{1063}

Usage:

All 3408 And 3412 Engines Equipped With An Aftercooler

Description of Change: A change has been made to the aftercooler groups used on the above engines. New adapters are used at the water inlet and outlet ports of the aftercooler. Also, new O-ring seals which are smaller in diameter are used with the new adapters.

During installation of the elbows, which fit over the former adapters, it was possible to damage the O-ring seal used between the elbows and adapters.

Adaptable To: The new 1W5947 Adapter is a direct replacement for the 4N5787 Adapter and is in effect with the engine Serial Numbers shown in the chart. Two adapters are used with each aftercooler group. For replacement of the former 4N5787 Adapter, order the new adapter and one 6F8146 Seal.

Location of 1W5947 Adapter and 6F8146 Seal in aftercooler group.

Caterpillar Information System:

1982/03/08 Reconditioning of Bridge Wear Seat Is Permitted; Will Prevent Bridge Replacement When Not Necessary{1100}

1982/03/08 Resurfaced Cylinder Blocks And Heads{1201,1101,1000}

1982/03/01 New 6V4180 Off-Engine Lifter Setting Tool Group{0654}

1982/03/01 New Gasket Used In Governor And Fuel Injection Pump Group{1259,1286}

1982/03/01 Shorter Bolts Used In Four Locations To Fasten Piston Motor Head To Body{3201,4351,5058}

1982/02/22 New Idler Shaft Used In Fuel Transfer Pumps{1256}

1982/02/22 Use 6V6035 Hardness Tester On Crankshafts{0651,1202}

1982/02/22 Screen Added To Oil Lines At Inlet Of Brake And Torque Converter Oil Cooler{1366,1365,1375,1376,3103,3154,3179,4257,4304,5057,5068}

1982/02/22 Engine Storage; Engine Start-Up After Storage{1000}

1982/02/22 Use A Magnetic Chuck To Hold Parts On Work Bench{0626}

1982/02/22 Improved Bearing Used In Rear Power Takeoff Groups{3055}

1982/02/22 New Piston And More Springs Used In Transmission{3155,3170}

1982/03/08 Reminder: Operation Of Track-Type Tractors And Pipelayers On Steep Slopes{3067,3179,4107}

1982/03/08 Correct Lubrication Procedure Will Prevent Damage To Fan Drive{1359,0374,0375}

1982/03/08 Improved Circle Drive Housing{5207}

1982/03/15 More Flexible Hose For Use With Hydraulic Flowmeter{0651,5050}

1982/03/15 New Crankshaft Has Wider Main Journals; Wider Main Bearings{1202,1203}

1982/03/15 Difference Between Static And Dynamic Rack Settings Changed{0374,1257}

1982/03/15 New Diaphragm Used In Fuel Ratio Control{1278}

1982/03/15 Use The 6V6059 Microlite With The 6V2196 Inspection Microscope{0651}

1982/03/15 New O-Ring Seal Used On Cartridge-Type Relief Valves Has Better Resistance To Damage{5050,3200}

1982/03/15 New Stem And Springs In Overspeed Valves Permit Operation Down Steeper Grades Without Track Motor Damage{5051,5451,5474}

1982/03/15 Service Parts Available For 6G7650 Seat{7312,7307,7321}

1982/03/22 Carbon Build-Up In Combustion And Inlet Areas{1058,1101,1105,1214,1104}