1986/04/21 Caterpillar

Correct Position Of The Bleed Hole In The Fuel Line Adapter{1252}

Usage:

All 3400 Series Engines With 4N1797 Adapter Assemblies In Fuel Injection Lines

All 3400 Series Engines, except later 3408 and 3412 Engines, use a 4N1797 Adapter Assembly where the injection line enters the head or valve cover. This adapter has a bleed hole for the purpose of allowing fuel to leak outside the engine if the internal fuel line loosens or leaks where it seats in the end of the adapter. See illustration.

Correct positioning of the fuel bleed hole in the fuel line adapter.

The adapter must be turned so the cross-drilled portion of the bleed hole points downward. If this hole points upward, it can become plugged with dirt. A plugged hole allows fuel to enter the engine and dilute the oil if the internal fuel line leaks.

Make a NOTE of this in the various Service Manual Disassembly and Assembly Modules in the Section on Fuel Injection Lines.

Caterpillar Information System:

1986/04/21 Three Element Speed Switch Replaces Dual Element Speed Switch{7418,7411,7410,7421}

1986/04/21 New Tool Available To Measure Propeller Pitch{0600,3305}

1986/04/21 Silicone Rubber Hoses Available For Engine Oil Cooler Water Lines{1378,1380}

1986/04/21 New Alternators Are Self-Energizing And Have Built-In Regulators{1405}

1986/04/07 Bleed Screw Washer (Seal) Must Be Replaced If Bleed Screw Removed From Fuel Nozzle{1254}

1986/04/07 New Index Lists Engine Special Instructions By SMCS Code{1000,0374}

1986/04/07 Fuel Injection Timing Changed To 15° With New 3.5° Timing Advance{1206,1272,1292}

1986/04/07 New Bracket Used In Air Compressor Lines Group{1803,1804,1800}

1986/04/07 Troubleshooting Solid State Suppressors{4467,4466,4450}

1986/04/07 Adjust Bridge Whenever Valve Clearance Adjustments Are Made{1121,1105,1100}

1986/04/07 Requirements For Shipping Wet Batteries In The U.S.{1401,7500}

1986/03/24 Incorrect Connection Of Battery Charger Can Open Circuit Breaker And Damage Woodward 2301 Governor Control{1400,1401,4450}

1986/04/21 Fittings Added To Jacket Water Heater Hose To Prevent Interference With Folded Core Radiator{1353,1383}

1986/04/21 New Wire Assemblies And Spark Plug Insulators Improve Service Life Of Ignition System{1558,1555,1552,1408}

1986/04/21 New Conversion Groups Available To Convert From Hydramechanical Governors To Woodward PSG Governors{1289}

1986/04/21 Use Care When Removing Oil Pan And 9N3167 Plate{1302}

1986/05/05 New Publication Lists Service Manual Modules for Caterpillar Earthmoving And Engine Service Manuals{0374,0375}

1986/05/05 Be Sure The Polarity Of The Electrical Connector On EG3P Woodward Actuator Assembly Is Correct{1265,1250}

1986/05/05 Portable Hydraulic Pump Group Available{0600}

1986/05/05 FT Tooling Prints Available For Bushing Installation In Governor Housing{0600,1287}

1986/05/05 Service Reminders For 3400 Family Of Diesel Engines{1204,1214,1331}

1986/05/05 Special Editions of Service Magazine And How To Find Them{0374}

1986/05/12 Top Shaft Wear Sleeve For 7241 Marine Transmissions Can Be Used On 7231 Marine Transmissions{3306}

1986/05/12 Cylinder Liner Seat Insert Available{1217,1200}