1991/01/07 Caterpillar

Checking Crankshaft Journal Surface Hardness On Remanufactured Crankshafts{1202}

Usage:

3200, 3300, And 3400 Families Of Engines

Some Remanufactured crankshafts have been hardened by a Meloniting heat treat process. This process provides a thin surface hardness. DO NOT attempt to measure the surface hardness of journals on these crankshafts with a mechanical hardness checking instrument, such as a Sclerometer. A mechanical hardness checking instrument will indicate a low hardness level and may damage the journal.

Remanufactured crankshafts that have been hardened by the Meloniting process are stamped "MHT" in the same area the Remanufactured part number and date code are stamped. Be sure to check for the "MHT" mark before attempting to take any hardness measurements. If the Remanufactured crankshaft is stamped "MHT", DO NOT use a mechanical hardness checking instrument to check the journal hardness.

Caterpillar Information System:

1990/12/24 New Tube And Bracket Provide Clearance For Alternator{1380,1405}

1990/12/24 Auxiliary Oil Filter Groups Used To Increase Oil Capacity And Extend Oil Change Interval To 750 Hours{1318,7534}

1990/12/24 Oversized Intake And Exhaust Valve Seat Inserts Available For Spark-Ignited Engine Heads{1103}

1990/12/24 New Seals Available For Parts Service Of Noncurrent Water Lines Group{1380,1155,1378}

1990/12/24 New 3E0020 Vehicle Speed Buffer Used{1914,1900}

1990/12/24 Update Information For Exhaust Manifolds{1059}

1990/12/24 Air Pressure Settings For Pneumatic Selector Control Valve On Reintjes® Marine Transmissions{3313}

1990/12/24 Installation Of Zinc Rods In Caterpillar Marine Engines{1350,1388}

1990/12/24 Incorrect Specification For Tightening Turbocharger Compressor Nut In Service Manual For 3306B Diesel Truck Engine, SEBR0545-01{1052}

1990/12/24 Sealed Alternators Available For Earthmoving Applications{1405}

1990/12/17 New Ether Starting Aid Groups Available{1456}

1990/12/17 Personality Module Software Updated; Do Not Troubleshoot Diagnostic Code 55 (No Detected Faults){1901,1902}

1991/01/07 New Boost Line Hose Assemblies Withstand Higher Temperatures{1081,1057,1088,7554}

1991/01/14 4C8753 Extended Collet Available; Problems With 8T1002 Probe For Fuel Setting{0782}

1991/01/14 Air Compressor Manifolds Are No Longer Available{1803}

1991/01/14 New Battery Load Tester Available To Service Six, Eight, And 12 Volt Batteries{0785,1401}

1991/01/28 New Bracket Assemblies Used In Lifter Group{1209,1281}

1991/01/28 Special Instruction SEHS9298 Gives Installation And Maintenance Information For Gaseous Fuel Filters{1261,1262}

1991/01/28 New Top Piston Ring Improves Wear Resistance{1215}

1991/01/28 Be Sure To Check Inlet Valve Rotocoils After An Engine Overspeed{1109,1105}

1991/02/11 New Sleeve-Type Bearings Give Better Carburetor And Governor Control{1265,1266}

1991/02/11 New Altronic V Magneto Used{1552}

1991/02/11 New Water Temperature Regulator{1355}

1991/02/18 Be Sure To Remove All Air From The Fuel System On A Truck That Has Run Out Of Fuel, Had The Fuel Filter Changed, Or Had The Governor Removed{1250,1256,1261,1264,1274}