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:

1997/11/10 Handling Instructions For Water Pumps {1361}

1997/11/03 Proper Welding Procedure On Machines And Engines With Electronic Controls {1400}

1997/10/27 History Of Pump Impeller (Water Pump) Changes{1364}

1997/10/27 Significant Improvement For Pump Impellers (Water Pumps){1364}

1997/10/20 Service Interval Change For Extended Life Coolant Extender And Extended Life Coolant{1395,7543,7545}

1997/10/13 Follow Guidelines When Cleaning And Storing Friction Discs To Improve Service Life{3187}

1997/10/13 Possible Downloading Problem When Truck Payload Measurement V8.0 Is Used With Windows '95{7494}

1997/10/06 Proper Welding Procedure On Machines And Engines With Electronic Controls{1400}

1997/10/06 Service Charts And Decals Available{0374,0375}

1997/09/29 Handling Instructions For Water Pumps{1361}

1997/09/08 3406C Pump And Governor Changes Provide Improved Oil And Fuel Leak Resistence{7555}

1997/09/01 Improvement Provides Better Sealing For Unit Injectors {1290}

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}

1998/01/19 Machine Flash Software Ordered Through The Parts Distribution System Now Available Through Corporate Mail Box{1900,1920}

1998/01/19 Improved Alpha-Numeric SMCS (Service Management Control System) Component Codes Allow For Future Expansion Of System Categories{0374}

1998/01/19 Use 126-7175 Push Puller Assembly For Various General Purpose Applications{0600}

1998/01/19 Use 1U-9500 Flow Communicator On Caterpillar Diagnostic Tools{1250,0782}

1998/01/26 The 154-6732 Pump Kit Is Available To Help Service The Unit Injector Hydraulic Pump Group On 3408E (99C) And 3412E (80M) Machine Engines {1714}

1998/01/26 Be Sure To Correctly Tighten 1R-0712, 1R-0740, 1R-0749, 1R-0750, 1R-0751, 1R-0753, And 1R-0759 Fuel Filter Assemblies {1261}

1998/01/26 Caterpillar Electronic Technician (ET) Training Video Available {0374}

1998/02/02 Machine Flash Software (Non-Engine Software) Ordered Through The Parts Distribution System Is Now Available Through The Corporate Mail Box {1900,1920}

1998/02/09 8N-4617 Air Cleaner Clamp Kit Available {1051}

1998/02/09 Replacements Products Available For 4C-4079 Brake And Component Cleaner {0680}