1983/08/15 Caterpillar


Information For Repair Of Hydraulic Fuel Ratio Controls{1278}

Usage:


All D348, D349, D353 And 3400 Series Diesel Engines Equipped With Hydraulic Fuel Ratio Controls

During repair of a hydraulic fuel ratio control group, all the parts except the diaphragm can be cleaned with a solvent. The current (white) and former (gray) diaphragms used in the hydraulic fuel ratio controls are made of a silicone material. These diaphragms must not come in contact with any solvents. Solvents will cause the diaphragm to swell (increase in size), lose some of its strength and possibly cause a failure of the diaphragm.

After the parts have been cleaned, it is important to thoroughly prelubricate the valve assembly and the inside of the housing that makes contact with the seal on the piston. These areas must be lubricated with clean engine oil before the parts are assembled. The oil will permit the parts to move freely when the fuel ratio control is tested after assembly.

FT1820 Assembly Fixture will make repair of fuel ratio control groups easier. The fabricated tool can be put in a vise and then the fuel ratio control fastened to the fabricated tool. The FT1820 Assembly Fixture will hold the fuel ratio control in position while it is disassembled and assembled. Drawings of FT1820 are available from your Division Service Manager.

Caterpillar Information System:

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}
1983/07/11 New Oil Filter Elements Available For Engine, Transmission And Hydraulic Applications{1318,3067,3179,5068}
1983/07/04 New O-Ring Seal For Water Lines Groups Is Made Of Different Material For More Resistance To Twists And Damage{1380,1362}
1983/08/15 New Filter Orifice Helps Prevent Governor Surge{1264,1263}
1983/08/15 New Actuator Cylinder Used In Air Shutoff{7418,1078}
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}
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