1983/08/15 Caterpillar

New Actuator Cylinder Used In Air Shutoff{7418,1078}

Usage:

All D379, D398 And D399 Industrial, Marine And Generator Set Engines Equipped With Hydraulic Actuated Air Shutoffs

Description of Change: A new hydraulic actuator cylinder is now used in the air shutoff groups on the above engines. The new cylinder has a stronger return spring. This stronger spring will improve the operation of the shutoff group.

Formerly, it was possible for small increases in oil pressure in the air shutoff hydraulic circuit to cause the cylinder to activate the air shutoff. If only one side is activated by these pressure increases, it is possible to damage the engine because fuel that is not burnt will accumulate in one bank of the cylinders.

Adaptable As: The new 2W6314 Cylinder is a direct replacement for the former 5N8963 Cylinder.

Caterpillar Information System:

1983/08/15 New Filter Orifice Helps Prevent Governor Surge{1264,1263}

1983/08/15 Information For Repair Of Hydraulic Fuel Ratio Controls{1278}

1983/08/15 New Service Tools Available{0600}

1983/08/08 New Procedure And New Tool Can Be Used To Remove Cylinder Sleeves From The Cylinder Block{1222,1223}

1983/08/08 Special Instruction Has Repair Procedure For 6V4060 Engine Set Point Indicator Group{0651}

1983/08/08 New Housing Assembly, Front Housing And Carrier Used In 8L4230 And 8L4231 Marine Gear Groups (Twin Disc MG509){3300}

1983/08/08 Hydraulic Boring Machine Available{0664}

1983/08/08 Failure Of Ballstud In Control Valve Can Cause Problem With Control Of Vessel{3313}

1983/08/08 New 6V7070 And 6V7800 Digital Multimeters Available{0651}

1983/07/11 New Fuel Lines And New Mounting Design Now Used{1252}

1983/07/11 Remanufactured Unit Injectors Are Available{1290}

1983/07/11 Use A Pipe Plug For Repairs of Small Holes In Castings{1201,1350}

1983/08/15 New Liner Seat Insert Available{1217}

1983/08/15 Recommendations For Use Of 6V6125 Infrared Thermometer{0651}

1983/08/15 Keep Alternators Without Pulleys In A Horizontal Position During Installation To Prevent Internal Damage{1405}

1983/08/15 Repair Of Damaged Threads{0660}

1983/08/15 Recommendations To Avoid Piston Seizures{1214,1213,1215}

1983/08/15 Digital Tachometer Available{7462}

1983/08/15 New Turbocharger Exhaust Coupling Prevents Exhaust Gas Leakage{1052,1059,1061}

1983/08/15 3512 Generator Set Engines (1500 And 1800 RPM) Must Use Flywheel Balance Weights{1156}

1983/08/15 Troubleshooting Engine Vibration; Damper Adapter Can Be Changed{1205,1000}

1983/08/15 New Fuel Ratio Control Group Has Improved Diaphragm{1278,1257,1251}

1983/08/15 New Water Seals Used In Cylinder Head Groups{1115,1101}

1983/08/15 Replacement Parts And Service For 6V3021 Crimping Tool And 6V3022 Cable Cutter{0610}