1981/03/23 Caterpillar

Fuel Pressure Relief Valve Is Shown Inverted (Wrong End Up) In Parts Book Illustrations {1253,1286}

Usage:

3208 Engines

The fuel pressure relief valve (4N1767 Fuel Bypass Valve) is shown in an inverted (wrong end up) position in some illustrations of governor and fuel injection pump groups in Parts Books for 3208 Engines. This has caused some wrong installations of the valve, when the illustration was used as a reference for assembly.

While wrong installation of the valve increases the fuel pressure approximately 20 to 35 kPa (3 to 5 psi), it is not expected to cause any problems in engine operation or performance, but it does have a minimum effect on modulation of fuel pressure.

To install the 4N1767 Fuel Bypass Valve correctly, put the end with four flutes (grooves) down in the housing. The top end has a round, cylinder-shape that fits inside the spring. In this position, the flutes on the bottom end of the valve give good modulation of fuel pressure.

Caterpillar Information System:

1981/03/23 6V4009 Dowel Driver Available {0622,1101}

1981/03/23 6V2029 Fixture Group Available For Adjustment Of Air/Fuel Ratio Control {0626,1278,0652}

1981/03/16 New Shield Assemblies Used In Water Shielded Manifold Group{1067}

1981/03/16 New Inlet And Exhaust Valves And Valve Guides Have Tighter Fit To Prevent Corrosion And Guide Wear{1104,1105,1101,1103,1108,1109}

1981/03/16 5P1075 And 5P1076 Washers Have A Different Design{7553,0680}

1981/03/16 Approximate Liquid (Refill) Capacities Added To Specifications Page In Parts Book{0374}

1981/03/09 Clean Electrical Contacts In Exhaust Gas Recirculation (E.G.R.) Switch Group And Cover Assembly Before Installation{1080}

1981/03/09 New Aftercooler Core has Improved Design To Prevent Vibration Damage Which Lets Coolant Into Engine Air Inlet{1064}

1981/03/09 Correct Installation Of Inserts Necessary During Repairs To Prevent More Counterbore Cracks{1217,1201}

1981/03/09 Special Studs And Nuts Available For Exhaust Manifolds On Engines Used In Heavy Load Conditions{1059,1101}

1981/03/09 Test Procedure For Exciter Reactors On SRSE Generators{4454}

1981/03/09 New Poppet Valves And Piston Available As Replacement Parts; Automatic Center Punch Can Be Used To Install Piston{3012,0622,0626,3166,3185}

1981/03/23 Longer Cable Assembly Now Used In The 9S2000 Flowmeter {0651}

1981/03/23 Correction To Torque Specification For Locknuts On Valve Clearance Adjustment Screws Of Engines Equipped With Jacobs Engine Brakes {1119,1102}

1981/03/23 New Tool Makes Glow Plug Wire Removal Easier {0622,0621,1403}

1981/03/30 Check All Settings When Fuel Injection Pump Group Is Installed{1286,1264,1251,1253}

1981/03/30 Low Engine Temperatures: Install Check Valve{1353,1355,1370,1380}

1981/03/30 6V3197 Spacer, 6V3041 Tool Group Available For Use During Removal and Installation Of Piston Pin Bearings{0622,1219,1218,1214}

1981/03/30 6V3150 Engine Pressure Group Gives Direct Indication Of Manifold Pressure{0651,1058}

1981/03/30 Electrical Information For EGR (Exhaust Gas Recirculation) Systems On 3208 Truck Engines So Equipped{1080}

1981/03/30 Brass Plug Now Used Instead Of Steel Plug In Sea Water Aftercooler{1063}

1981/04/06 Woodward Governor Available For Parallel Generator Applications{1289,1264}

1981/04/06 New Spacer And Plate Used In Transmission Lower Shaft Groups{3307}

1981/04/06 New Temperature Range Recommendation For Multi-Viscosity Oil In Power Shift Transmissions{3179,3155,3159}