1980/06/23 Caterpillar

Check Journal Hardness On Reground Crankshafts{1202,1203,1219,1230}

Usage:

All Engines

During a crankshaft bearing failure, the crankshaft becomes very hot. This heat can change the hardness of the surface of crankshaft journals.

If the hardness is not in the specifications range and the crankshaft is reground to be used again, a failure is possible.

When a crankshaft is reground after a bearing failure, remember ...

... Grind the damaged journal first.

... Check the hardness of the damaged journal.

... Grind the other journals and check their hardness.

... With the crankshaft in the same position it is in when the engine is at top dead center, check the hardness of the journals in two places, on their top and bottom.

... The hardness of the main journals also must be checked in two places 180° apart.

See the "Guidelines For Reusable Parts - Crankshaft Measurement" SEBF8041 for the correct procedures and specifications.

Caterpillar Information System:

1980/06/23 Do Not Add Caterpillar Cooling System Conditioner (Corrosion Inhibitor) To New Machines Before Delivery; Cooling System Conditioner Service Interval Changed{1350}

1980/06/23 In The Future, Oversize And Undersize Connecting Rod And Main Bearings Will Have Size Identification Marks In Metric Units{1230,1203,1219}

1980/06/23 Check Retainer Screw Depth In Plastic Pads Of 5P8637 Crankshaft Support Groups{0665}

1980/06/23 Improved 2P2342 Hose Group Is Available For Beadless Tires{0611,4211}

1980/06/23 Visual Checks And Easy Tests Can Be Of Assistance When Troubleshooting Coolant Leakage Into The Lubrication System{1305,1318}

1980/06/16 Timing Groups To Be Canceled{0654,1250}

1980/06/16 6V3075 Dial Indicator (Metric) Is Available{0653}

1980/06/16 6V3115 Repair Kit Is Available{0611,1380,1353}

1980/06/09 Check For Short Circuit In Rotor Field Windings If Low AC (Alternating Current) Voltage Is A Problem{4455,4457}

1980/06/09 6V2050 Tapered Rod Tool Group Available For Removal And Installation Of Bearings{1219,1218,1214}

1980/06/02 New Cylinder Sleeve Is Available For Repairs Of Worn And/Or Damaged Cylinders{1216,1201}

1980/06/02 Oil Pump Drive Sleeves Now Available Separately For Parts Service{3300}

1980/06/23 Follow Correct Procedures For Installation Of Fuel Filters And Priming The Fuel Systems{1261,1258}

1980/06/30 Kysor Air-Operated Shutdown Actuators For 3406, 3408, 1693 Truck Engines{7400,1265}

1980/06/30 New Planetary Group Has Gears Which Operate With Lower Noise Levels{3301,3304}

1980/07/14 Use The 6V2056 Rod And 6V2057 Point To Find True Top Center{0653}

1980/07/14 Two New Front Power Take-Off Groups Are Available{3055}

1980/07/14 Some Nuts Used On Main Bearing Caps Are Smaller Than Standard Size Across The Flat Sides{1203}

1980/08/04 New Bend Specification For Used Or Field Reground Crankshafts{1202}

1980/08/04 The Service Publications Information Feedback System{0374}

1980/08/04 Pistons Which Use Keystone-Type Rings Can Be Installed In Place Of Pistons Which Use Rectangular-Type Rings{1215,1214,1213}

1980/08/11 6V3030 Digital Multimeter, 6V3031 Case And 6V3032 Test Lead Kit Are Now Available For Troubleshooting Electrical Circuits And Components{0651}

1980/08/11 6V2196 Microscope Available For Inspection Purposes{0653}

1980/08/11 New Oil Filter Base Has Larger Oil Passages; Some Bases Need Modification{1306}