1987/04/20 Caterpillar

New Pipe Used Between Turbocharger And Aftercooler; Improved Turbocharger Compressor Housing Has Two Retaining Bolt Holes{1050,1061,1079}

Usage:

785 Trucks, 3512 Vehicular Engines

Description of Change: New pipes and retainers are used in the air lines groups on 785 Trucks and 3512 Vehicular Engines. The new parts will improve the connection between the turbocharger and the aftercooler. The new retainers are in the shape of a "C" to provide more contact area.

Also, an improved turbocharger compressor housing is used in the turbocharger group. The improved housing now has two threaded holes for retaining the pipe and a longer bore for the pipe. Formerly, one bolt and washer were used to hold the pipe in the bore of the compressor housing.

Adaptable To: The new and former parts are shown in the chart. The new retainer is a direct replacement for the former washer. The improved housing and new pipe must be used together. The part number of the housing did not change, but the improved 7W2299 Housing can be identified by two threaded holes on the outlet of the compressor housing. The changes to the air lines and turbocharger groups are in effect with 8GB231 on 785 Trucks and 51Y522 on 3512 Vehicular Engines.

Caterpillar Information System:

1987/04/13 Initial Start Of Engine Using An EGB29P Governor/Actuator After Filling With Oil{1264}

1987/04/13 Checking Injector Synchronization On Engines Equipped With New 11.0 mm Injectors{1290}

1987/04/06 Longer Bolts With Spacers Now Used On Exhaust Manifolds{1059}

1987/04/06 New Idler Shaft And Sealing Washers Used In Front Gears And Accessory Drives{1206,1207}

1987/04/06 Rerate Plates And 4W5140 Engine Information Plate Available For Use When Rerating 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 Engine Identification Plate Information For 3406B (PEEC) Truck Engines{0782,1250}

1987/04/06 Improved Governor Performance{1264,1250}

1987/04/06 Stop Engine If There Is A Turbocharger Bearing Failure{1052,1318}

1987/03/30 Oversize Piston Ring Seal Available For Clutch Group {3302,3300}

1987/03/30 Salvage Of Cylinder Heads By Using Oversized Valve Guides And Valve Inserts {1104,1103}

1987/03/30 New Washer Used In Fuel Transfer Pump Group {1256}

1987/03/30 Oversize Bearings For Turbocharger Center Housings Available {1053,1052}

1987/04/20 Serviceable Parts For New Fuel Ratio Control; Pressurize Control To Set Rack On 3406B Engines In Driltech Drill Rigs{1257,1258,1264}

1987/04/20 Material Changed In Exhaust and Inlet Valves{1105}

1987/04/20 Fuel Injection Timing Adjustment{1250}

1987/04/20 Improved Fuel Priming Pump Used{1258}

1987/04/20 Use Improved Heat Start Switch{1416}

1987/04/20 Moisture Cover Available For Start Switches{1416,1424}

1987/04/20 Microfiche Library Cross References Caterpillar Part Numbers With Expanded Product Line Part Numbers{7567}

1987/04/20 New Service Tools Available{0600}

1987/05/04 Products Equipped With Diagnostic Connectors Require Less Time For Electrical Troubleshooting{1400}

1987/05/04 Alternator "R" Terminal Wire Assembly Available For Wiring Harness Repair{1408}

1987/05/04 Alternator/Generator Output Test On The Engine{1401,1404,1405,1406}

1987/05/04 Testing The Starter On The Engine{1401,1450}