1981/01/19 Caterpillar

Be Sure You Assemble The Turbocharger Lubrication Valve Correctly{1309,1052,1300}

Usage:

992B Loaders;
773 and 777 Trucks;
772 and 776 Tractors;
641B, 651B, 657B Tractors;
D346 ( 98N ) and D348 ( 57K ) Vehicular Engines

The turbocharger lubrication valve for the above machines gives an immediate flow of unfiltered oil (oil that is not filtered) to the turbocharger bearings when the engine is first started. As the pressure of the filtered oil increases, the plunger will move against the force of the spring. The flow of unfiltered oil is stopped and only filtered oil then flows to the turbocharger bearings.

If the lubrication valve is removed from the engine for any reason, make sure it is assembled correctly at time of installation. The valve plunger must be installed first, then the spring and cover. See the illustration. If the valve is not assembled correctly, the flow of unfiltered oil will not be stopped. This can cause early failure of engine components.

Correct installation of valve plunger and spring.

Caterpillar Information System:

1981/01/19 New Sure Seal Electrical Connectors Used In Electrical Wiring Harnesses; Use 6V3000 Seal Repair Kit To Repair Sure Seal Electrical Connectors{0611,1408}

1981/01/19 Inspection And Test Procedures To Follow When Fuel Ratio Control Does Not Operate Correctly{1278}

1981/01/19 6V3141 And 6V3142 Puller Plates Available For Removal Of Tube And Gland From Front Suspension Groups{7201,0621}

1981/01/19 Thicker Layer Of Chrome Now Used On Governor Spring Guide To Extend Its Service Life{1264}

1981/01/19 New Connecting Rod And Main Bearings Have A Thicker Coating (Layer) Of Lead-Tin Overlay{1230,1219,1203}

1981/01/12 Improvements Made To 5P9718 And 6V186 Disc Pads Used During Gasket Removal{0675,0670}

1980/12/22 Wrong Turbocharger Group Shown In Parts Book{1052,0374}

1980/12/22 New Oil Pan Gasket Has Silicone Bead For Better Seal{1302}

1980/12/22 Exhaust Elbow Support Improved{1059,1061}

1980/12/22 Tires Are Filled With Nitrogen (N2){4203}

1980/12/22 6V4019 Camshaft Pilot Group Is Available{0622,1210,1211,1201}

1980/12/15 Replacement Timing Belts And Variable Belt For Fuel Injection Test Benches Available From Caterpillar{0652,1250}

1981/01/26 Ways To Prevent Damage To Spark Ignited Industrial Engines When Hydrogen Sulfide Is Present In The Fuel{1000,1280,1318,1350}

1981/01/26 Improved Tach Drive Adapter Has Step In Shaft To Keep Coupling Engaged{0651,0653}

1981/01/26 6V3150 Engine Pressure Group And 6V3121 Multitach Group Are Available For Testing Engines{0650,1000}

1981/01/26 Use Scheduled Oil Sampling To Find Change Intervals For Hydraulic Oil{5068}

1981/01/26 6V2009 Adapter Group Available To Test Scroll Fuel System On Fuel Injection Test Bench; Additional Parts Are Needed{0652}

1981/01/26 Use 2P2333 Manifold Sealer On Exhaust Manifold Slip Joints (Junction) During Assembly{1059}

1981/02/02 6V3129 Nozzle Puller Group And FT1533 Nozzle Assembly Adapter Can Be Used To Remove Fuel Nozzles{0621,1254}

1981/02/02 New Exhaust Manifold Has Slip-Joint Connections{1059,1061}

1981/02/02 New, One-Piece Valve Lifter Used{1209}

1981/02/02 Corrected "5.4" 60°V Main Bearing Selection Guide" Is Now Available{0374,1203,1202}

1981/02/02 Aluminum Identification Plate No Longer Used On Torque Converters; Identification Numbers Put Directly On Converter Housing{3101}

1981/02/02 Elbow With Orifice Now Used In Regulator And Housing Groups For Cooling Systems{1355,1361}