1983/10/03 Caterpillar

New Oil Pump Has Bypass Valve And Oil Return Passage Inside The Pump{1304}

Usage:

D379, D398, D399 Industrial, Marine, And Generator Set Engines;
G379, G398 Natural Gas Engines

Description of Change: New oil pump groups used on the above models have the bypass valve and oil return passage inside the pump. This permits the oil from the bypass valve to flow directly to the pump inlet instead of back to the oil pan. The outside oil lines and bypass valve are no longer used. These changes will prevent possible leakage at outside connections, and decrease the amount of oil which must flow through the pump suction line. This will also decrease aeration (air bubbles) of the oil and cavitation (air) in the pump. The gears, bearings, and shafts in the oil pump are not changed.

Adaptable To: The new pump groups can be installed in place of the former pumps, when the other necessary parts are used. The parts charts show the parts needed for replacement of each former pump. A Special Instruction, Form SMHS7823, is available with complete installation information.

Caterpillar Information System:

1983/10/03 Use 6V6070 Tool Group And New Adjustment Procedure For New Scroll Fuel System{0654,1264,1278}

1983/09/26 Product Identification Number To Replace Serial Number On Earthmoving Equipment{7557}

1983/09/26 New Bearing Used On Main Shaft{3303}

1983/09/26 Service Information For Woodward Governors{0374,1264}

1983/09/26 Oil Shield And Rotocoil Must Be Installed Together For Acceptable Oil Control{1109}

1983/09/12 Parts Service Information For Pistons, Connecting Rods, Piston Pins And Rings{1214,1225,1215,1218}

1983/09/12 New Dust Covers Available For Twin Disc IBF318 And IBF321 Rear Power Take-Off Clutches{3055}

1983/09/12 New Larger Auxiliary Sea Water Pump Operates At Lower RPM{1371}

1983/09/05 Engine Maintenance Information Films Available{1318,1352,0375}

1983/09/05 Vent Hole In Water Temperature Regulator Cover Removed{1355}

1983/09/05 6V3100 Engine Timing Indicator Group May Have 6V9710 Or 6V2192 Transducer{0651}

1983/09/05 New Piston Oil Rings{1215}

1983/10/10 S.O.S Program Synopsis{1318,5068,3179,0652}

1983/10/10 New Connecting Rod And Main Bearings Used{1203,1219,1226,1227,1230}

1983/10/10 Changes Made To Identification Marks On Connecting Rod Assemblies{1218}

1983/10/10 New Service Centers For 6V3100 Engine Timing Indicator Group{0651}

1983/10/10 New Water Pump Oil Seal Prevents Leaks{1361}

1983/10/17 Broken Edge Filter Or Plugged Cylinder Head Adapter Can Cause Rough Engine Operation Or Low Power{1252}

1983/10/17 Changes Made To Air Intake Shut-offs And Contactor Groups{1078}

1983/10/17 New Air Starting Motor Has A Slip-Clutch Type Drive Gear{1451}

1983/10/17 Improved Lower Shaft Bearing Now Used{3307}

1983/10/17 Maintenance Free Battery Available For Use In On-Highway Trucks And Buses{1401}

1983/10/17 Modification Of Control Panel Gives Different Power Source For Overcrank Timer To Prevent Starter Motor Failures{7450}

1983/10/17 Remanufactured Fuel Pump And Governor Groups{1251,1264}