1997/12/22 Caterpillar

Thicker Head Gasket Available For Cylinder Block Salvage Procedure {1124}

Usage:

All Machines Powered By 3126 Engines

Reference: Service Magazine; October 5, 1992; Page 14; "Thicker Head Gaskets Available For Use With Resurfaced Cylinder Blocks."

Reference: Guideline For Reusable Parts And Salvage Operations; SEBF8277; "Specifications And Salvage For Cylinder Blocks On 3126 Engines".

Description of Change: A thicker head gasket is available for all machines powered by 3126 Engines. The thicker head gasket is used after salvage milling procedures to the cylinder block.

Adaptable To: The 119-2948 Head Gasket is adaptable to first production for the machine engines.

3126 Engine blocks with heights less than 321.75 mm (12.667 in) require the use of the 119-2948 Head Gasket. The gasket is .25 mm (.010 in) thicker than the standard head gasket. The thicker head gasket allows the block deck to be resurfaced below what would be possible with the standard head gasket. The increased material removed from the block deck causes the pistons to project higher above the block surface at Top Center (TC). The thicker head gasket keeps the pistons from hitting the cylinder head and valves.

NOTE: The 119-2948 Head Gasket should not be used unless the block has been resurfaced below the minimum specified measurement. Using the 119-2948 Head Gasket when it is not needed will result in a lower compression ratio and may cause hard starting and excessive white smoke.

Caterpillar Information System:

1997/12/22 New Tightening Specification For "Spin-on" Oil Filter Assembly {1306,1308}

1997/12/22 Removing Trapped Air In Hydraulic Lines And Auxiliary Attachments In Order To Prevent Drift {5057,5116,6408}

1997/12/22 Eye End (Brake Cable) Attachment Pin And Related Hardware Available {4267}

1997/12/22 New Hydrostatic Drive Pump Group Has Stronger Head {3203}

1997/12/22 Revised Systems Operation Testing And Adjusting Manual, SENR5890-02, Transmission Electronic Control System, Now Available {0375,3168}

1997/12/22 New Screen Covers For Hoods And Side Panel Louvers Now Available To Prevent Debris And Snow Ingress {7315,1151}

1997/12/22 New Autoshift Transmission Available {3030,3168,7459}

1997/12/22 Brake Purge Ports Added To Improve Brake Serviceability {4251}

1997/12/22 Recommended Tire And Rim Usage {4201,4202,4203}

1997/12/22 Special Instruction, SEHS9967-01, Available For 24H Motor Grader Assembly Instruction {0374,7000,7960}

1997/12/15 Caterpillar Extended Life Coolant (ELC) Is The Standard Factory Fill For The Engine Cooling System On Machines Built At The Sagami, Japan Factory {1395}

1997/12/15 Revised Testing & Adjusting Manual, SENR6719-01, 938G Wheel Loader And IT38G Integrated Toolcarrier Traction Control System, Now Available {0374}

1997/12/22 Cylinder Sleeve Available For Reconditioning Cylinder Blocks {1222}

1997/12/22 Dry Lubricant Recommended For Use On Door Linkages, Door Seals, And Window Latches {7308}

1997/12/22 New Seat Slider Blocks Reduce Need For Adjustments {7312,7300}

1997/12/22 The 3P-8993 Speaker Assembly Discontinued And Replaced By 123-6449 Back-Up Alarm {7406}

1998/01/05 Components Available To Strengthen Engine Air Inlet System {1055,1071}

1998/01/05 Guard Assembly Available To Protect Rear Axle Filtration System And Lube Lines {3004,7150}

1998/01/05 Jacobs Engine Brake Parts Service Now Available {1129}

1998/01/05 New VIMS Service Manual Is Available {7601}

1998/01/05 VIMS-PC Version 2.4 Upgrade {7601}

1998/01/05 New VIMS Message Center Display Available {7601}

1998/01/05 New Water Separator Available {1250,1263}

1998/01/05 Correct Boom Chain Information {6404,6460}