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 New Piston Body Has Improved Bonding Between Iron Band And Aluminum Body{1214}

1994/01/31 Automatic Shut-Off Systems Not Recommended on Mobile Earthmoving Equipment {7418,7403}

1994/01/17 Low Coolant Level Plate In Radiator May Cause False Coolant Level Readings {1353}

1994/01/17 New Valve Cover Gasket Used {1107}

1994/01/17 New Control Assemblies Used In Fuel Injection Control Groups {1298}

1994/01/17 9X6779 Radio Has No Memory {7338}

1994/01/10 New Diaphragm Used In Governor Air Actuator Group Improves Service Life{1265}

1994/01/10 The 1W-1420 Oil Cooler Bracket For Marine Gears Has Been Modifie{3320}

1994/01/10 Clarify Usage Of Parts Service Cylinder Head Gaskets{1124}

1993/12/27 Double Shielded Bearings Released {4471}

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

1994/02/21 Servicing Lighted Rocker Switches {1435}

1994/02/28 Soldering Iron Available For Field Use {0709,1400}

1994/02/28 New Retaining Compound Is Available {0649}

1994/02/28 New Turbocharger Models Have Left-Hand Threads On Compressor Nut And Turbine Shaft {1053,1052}

1994/03/14 Articles Pertaining To Commercial Engines Or Truck Engines {0374}

1994/03/21 New Seal Used In Air Lines Group {1058}

1994/03/21 The Ninth Edition Of The Lubricating Oils Data Book Is Available From The Engine Manufactures Association (EMA) {1318}

1994/03/28 Improved 1R-0712 Fuel Filter Provides Improved Sealing{1261}

1994/04/04 Identification Of Intake And Exhaust Valves That May Be Used In Remanufactured Direct Injected 3400 Cylinder Heads{1105}

1994/04/11 Speed Sensor Available With Improved Reliability{1907}

1994/04/25 Lubricant Will Ease Installation Of Secondary Radial Seal Air Filter Element {1054}