1987/04/13 Caterpillar

Checking Injector Synchronization On Engines Equipped With New 11.0 mm Injectors{1290}

Usage:

All 3500 Family Engines Equipped With 7C341, 7C345 Or 7C2239 Injectors

When checking injector synchronization with the 8T2684 Rack Synchronization Gauge, the gauge fits between the rack collar and the injector body. On earlier 10.7 mm injectors, the gauge would contact the injector body. With the new 11.0 mm injector (7C341, 7C345 or 7C2239), the gauge will contact the top of the injector trim screw rather than the injector body. These injectors have been adjusted to provide calibration with the gauge contacting the top of the screw. When making the adjustment the feel may be slightly different because only a small area of the gauge will be in contact with the screw.

NOTE: Calibration of the 7C341, 7C345 and 7C2239 Injector Assemblies is made by adjustment of the trim screw. Because of this, do not turn the trim screw.

Caterpillar Information System:

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}

1987/03/30 Piston Cooling Jets No Longer Used In Some Applications {1200}

1987/03/30 New Service Tools Available {0600}

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

1987/04/20 New Pipe Used Between Turbocharger And Aftercooler; Improved Turbocharger Compressor Housing Has Two Retaining Bolt Holes{1050,1061,1079}

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}