1994/02/07 Caterpillar

Cylinder Head Gaskets Improved To Provide Better Fire Ring Retention{1124}

Usage:

Caterpillar Machines Powered By 3406C (11N),
3408C (48W) And 3412C (73W) Engines

Reference: Service Magazine; November 16, 1992; Page 13; "New Cylinder Head Gasket, Spacer Plate and Head Bolts Used; New Cylinder Liner Projection Measurement Method; New Cylinder Head Torque Sequence".

The flexibility of the cylinder head gaskets created the possibility of disengagement of the fire ring and wrap from the body of the gasket during handling. If a head gasket is installed without a fire ring and wrap, the head gasket will fail.

The design of the cylinder head gasket has been changed. The number of tabs that secure the fire ring and wrap to the gasket body has been increased from four per side to six per side. The additional tabs will help prevent accidental fire ring and wrap loss during handling. The part numbers of the improved cylinder head gaskets have not changed. The improved cylinder head gaskets are in effect as shown in the Chart.

Caterpillar Information System:

1994/02/07 New Turbocharger Groups And New Turbocharger Cartridge Groups Have Improved Thrust Bearing And Turbine Ring Seal{1052,1053}

1994/02/07 12 And 24 Volt DC Work Lights Are Available{0600}

1994/02/07 Longer Grease Hose Assembly Used In Fan Belt Tightener Groups{1358,1359}

1994/02/07 New Piston Body Has Improved Bonding Between Iron Band And Aluminum Body{1214}

1994/02/07 New Magnetic Drain Plug For Vibratory Bearing Reservoir Provides Early Warning Of Wear{6606}

1994/02/07 Suspension Control Valve Mounting Group Bolt Torque Specification Is Reduced To Prevent Control Valve Sticking And Scuffing{7214}

1994/02/07 Sump Guard Assembly (Crankcase Guard) Is Deeper And Has Thicker Material To Improve Clearance And Resist Bending{7151}

1994/02/07 New Wheel Bearing Adjustment Procedures{4208}

1994/02/07 New Pinion And Seal Assembly Replaces The Former Carbon Seal{3280,3254,3250}

1994/02/07 Cover Assembly Protect Hydraulic Tank Sight Glasses{5056}

1994/02/07 New Radio Mount Available For B Series Backhoe Loaders Equipped With Air Conditioning{7338}

1994/02/07 New Radiator Hose Clamp Allows Easier Tightening{1380}

1994/02/07 Fuel Injection Pump Improvements{1251}

1994/02/14 Multipurpose Tractor Oil (MTO) Is Usable In All Challenger Implement Hydraulic And Combined Implement And Steering Hydraulic Systems{5068,5050,5450}

1994/02/14 Air-To-Air Aftercooler Assembly Mounting Brackets Improved{1063}

1994/02/14 Engine Coolant Temperature Gauge May Run High{7400,7453}

1994/02/14 Thicker Retaining Ring Is Available For Use With CAT® GraderBit Assemblies{6151,6150}

1994/02/14 Publications Available For Off Highway Truck Retrofits{1290,1631,1900,3100,3150}

1994/02/14 Improved Wheel Bearing Cone Anti-Rotation System Prevents Wheel Bearing Cones From Rotating On The Axle Housing{4208,4234}

1994/02/14 Shorter Stud Used To Improve Sealing Between The Radiator Cap Assembly And Filler Adapter{1382,1353}

1994/02/14 New Universal Joint Groups Have Improved Sealing{3251,3253}

1994/02/14 Improved Mounting Method For Hydraulic Quick Hitch Pins{5133}

1994/02/21 New Parts Service Friction Disc Available For Machines With Shift Harshness Complaints {3150,3155}

1994/02/21 Right Hand Console Reinforcement {5258}